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Complete degradation of high-loaded phenol using tungstate-based ionic liquids with long chain substituent at mild conditions 被引量:1
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作者 Yingying Yang Honglei Fan +2 位作者 Tianbin Wu Guanying Yang Buxing Han 《Green Energy & Environment》 SCIE EI CSCD 2023年第2期452-458,共7页
Phenol in waste water threatens human health and is difficultly to be decomposed by nature.Efficient degradation of high-loaded phenol in water under mild condition is still a great challenge.Herein,ionic liquids with... Phenol in waste water threatens human health and is difficultly to be decomposed by nature.Efficient degradation of high-loaded phenol in water under mild condition is still a great challenge.Herein,ionic liquids with tungstate anion were designed and prepared.It was found that dodecyltrimethylammonium tungstate could catalyzed degradation of phenol into gases and water thoroughly at 323 k in 8 h.Tungstate anion revealed good catalytic oxidative activity and long carbon chain group connecting with cation of ionic liquids enriched phenol around catalysts,which induced the complete degradation of phenol at mild conditions.Increasing the amounts of hydrogen peroxide benefited to the total degradation of phenol.In addition,the ionic liquid could be reused for its excellent thermal stability.Our work provided a different strategy to treat waste water containing phenol efficiently. 展开更多
关键词 Ionic liquid Oxidative degradation PHENOL TUNGSTATE Hydrogen peroxide
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Heterogeneous catalytic activation of peroxymonosulfate for efficient degradation of organic pollutants by magnetic Cu^0/Fe_3O_4 submicron composites 被引量:10
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作者 聂刚 黄佳 +3 位作者 胡冶州 丁耀彬 韩小彦 唐和清 《Chinese Journal of Catalysis》 SCIE EI CAS CSCD 北大核心 2017年第2期227-239,共13页
Magnetic Cu^0/Fe3O4 submicron composites were prepared using a hydrothermal method and used as heterogeneous catalysts for the activation of peroxymonosulfate(PMS) and the degradation of organic pollutants.The as-pr... Magnetic Cu^0/Fe3O4 submicron composites were prepared using a hydrothermal method and used as heterogeneous catalysts for the activation of peroxymonosulfate(PMS) and the degradation of organic pollutants.The as-prepared magnetic Cu^0/Fe3O4 submicron composites were composed of Cu^0 and Fe3O4 crystals and had an average size of approximately 220 nm.The Cu^0/Fe3O4 composites could efficiently catalyze the activation of PMS to generate singlet oxygen,and thus induced the rapid degradation of rhodamine B,methylene blue,orange Ⅱ,phenol and 4-chlorophenol.The use of0.1 g/L of the Cu^0/Fe3O4 composites induced the complete removal of rhodamine B(20 μmol/L) in15 min,methylene blue(20 μmol/L) in 5 min,orange Ⅱ(20 μmol/L) in 10 min,phenol(0.1mmol/L) in 30 min and 4-chlorophenol(0.1 mmol/L) in 15 min with an initial pH value of 7.0 and a PMS concentration of 0.5 mmol/L.The total organic carbon(TOC) removal higher than 85%for all of these five pollutants was obtained in 30 min when the PMS concentration was 2.5 mmol/L.The rate of degradation was considerably higher than that obtained with Cu^0 or Fe3O4 particles alone.The enhanced catalytic activity of the Cu^0/Fe3O4 composites in the activation of PMS was attributed to the synergistic effect of the Cu^0 and Fe3O4 crystals in the composites.Singlet oxygen was identified as the primary reactive oxygen species responsible for pollutant degradation by electron spin resonance and radical quenching experiments.A possible mechanism for the activation of PMS by Cu^0/Fe3O4 composites is proposed as electron transfer from the organic pollutants to PMS induces the activation of PMS to generate ^1O2,which induces the degradation of the organic pollutants.As a magnetic catalyst,the Cu^0/Fe3O4 composites were easily recovered by magnetic separation,and exhibited excellent stability over five successive degradation cycles.The present study provides a facile and green heterogeneous catalysis method for the oxidative removal of organic pollutants. 展开更多
关键词 Heterogeneous catalysis Magnetic Cu^0/Fe3O4 composite PEROXYMONOSULFATE Singlet oxygen Oxidative degradation
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Evaluating two stages of silicone-containing arylene resin oxidation via experiment and molecular simulation
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作者 Jiangtao Cai Qingfu Huang +4 位作者 Huan Chen Tao Zhang Bo Niu Yayun Zhang Donghui Long 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2024年第2期189-202,共14页
Silicon-containing aryl acetylene resin(PSA)is a new type of high-temperature resistant resin with excellent oxidation resistance,whereas antioxidant reaction mechanism of PSA resin under ultra-high temperatures still... Silicon-containing aryl acetylene resin(PSA)is a new type of high-temperature resistant resin with excellent oxidation resistance,whereas antioxidant reaction mechanism of PSA resin under ultra-high temperatures still remains unclear.Herein,the oxidation behavior and mechanisms of PSA resin are systematically investigated combining kinetic analysis and Reax FF molecular dynamics(MD)simulations.Thermogravimetric analysis indicates that the oxidation process of PSA resin undergoes two main steps:oxidative mass gain and oxidative degradation.The distributed activation energy model(DAEM)is employed for describing oxidation processes and the best-fit one is obtained using genetic algorithms and differential evolution.DAEM model demonstrates that the oxidative weight gain stage is dominated by two virtual reactants and the oxidative degradation stage consists of three virtual reactants.Correspondingly,the observation of MD reaction pathways indicates that oxygen oxidation of unsaturated structures occurs in the initial stage,which results in the formation of PSA resin oxides.Furthermore,cracked pieces react with O_(2)to generate CO and other chemicals in the second step.The resin matrix's great antioxidation resilience is illustrated by the formation of SiO_(2).The analysis based on MD simulations exhibits an efficient computational proof with the experiments and DAEM methods.Based on the results,a two-stage reaction mechanism is proposed,which provides important theoretical support for the subsequent study of the oxidation behavior of silica-based resins. 展开更多
关键词 PSA resin Oxidative degradation Thermogravimetric analysis DAEM reaction kinetics ReaxFF simulation
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Thermal Oxidative Degradation and Ageing Performance of Silicone Rubber Filled with Attapulgite 被引量:2
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作者 Hua-hua Zhao Huan-ling Song +3 位作者 Xin-yao Tao Ge-xin Chen Ai-qin Wang Ling-jun Chou 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2021年第3期309-322,I0048,共15页
The natural attapulgite(NAPT)was disaggregated by high-pressure homogenization technology combined with extrusion process to prepare the attapulgite with disaggregated rod crystal bundles(DAPT)and large specific surfa... The natural attapulgite(NAPT)was disaggregated by high-pressure homogenization technology combined with extrusion process to prepare the attapulgite with disaggregated rod crystal bundles(DAPT)and large specific surface area of 133.7 m^(2)/g.NAPT and DAPT were incorporated into the silicone rubber to obtain the composite NAPTSR and DAPT-SR by mechanical blending method,respectively.After thermal oxidative ageing at 300℃ for 0.5 h,temperature for the 5%weight loss increased greatly from 385℃ of the neat silicone rubber to 396-399℃ with addition of NAPT and DAPT.NAPT and DAPT enhanced the interaction between the filler nanoparticles and rubber matrix thus inhibited the nanoparticle agglomeration.The conservation rate of the side methyl group in NAPT-SR and DAPT-SR was greatly improved after ageing.Therefore,the thermal oxidative degradation and ageing performance of the silicone rubber composites was significantly reinforced.Moreover,DAPT could greatly restrain the growth of nanoparticles after ageing.Therefore,DAPT-SR showed the better retention of tensile strength(40.6%),elongation at break(34.9%)and tear strength(30.1%)compared with the corresponding mechanical properties of the neat silicone rubber(10.6%,7.4%,and 5.0%)after ageing. 展开更多
关键词 Silicone rubber ATTAPULGITE COMPOSITES Thermal oxidative degradation Ageing
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Oxidative Degradation of o-Chlorophenol with Contact Glow Discharges in Aqueous Solution 被引量:1
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作者 高锦章 陈平 +3 位作者 杨武 纳鹏君 刘永军 陆泉芳 《Plasma Science and Technology》 SCIE EI CAS CSCD 2003年第1期1609-1614,共6页
Contact glow discharge electrolysis (CGDE) of o-chlorophenol (2-CP) was investigated under different pH, voltages and initial concentrations. And the mechanism of the oxidation was explored. The results suggested that... Contact glow discharge electrolysis (CGDE) of o-chlorophenol (2-CP) was investigated under different pH, voltages and initial concentrations. And the mechanism of the oxidation was explored. The results suggested that the degradation followed the first order kinetic law; Fe2+ had a remarkable catalytic effect on the removal rate of o-chloropenol. In the presence of Fe2+, 2-CP underwent an exhaustive degradation, from which the major intermediates included o-dihydroxybenze, p-hydroxybenze, p-benzoquione and carboxlic acids. 展开更多
关键词 contact glow discharge electrolysis O-CHLOROPHENOL PLASMA oxidative degradation
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Evalution of Thermal Oxidative Degradation of Trimethylol-propane Trioleate by TG/DTA/DSC 被引量:1
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作者 ZHAN Wen DUAN Haitao +2 位作者 LI Xinxiang LI Jian YUAN Chengqing 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2021年第2期280-288,共9页
In order to evaluate the thermal oxidation degradation behavior of lubricant with different antioxidants,the thermal kinetics equation based on the anlyses of thermogravimetry(TG),differential thermal analysis(DTA),an... In order to evaluate the thermal oxidation degradation behavior of lubricant with different antioxidants,the thermal kinetics equation based on the anlyses of thermogravimetry(TG),differential thermal analysis(DTA),and differential scanning calorimetry(DSC)was established,respectively,to calculate the activation energy of lubricant thermal-oxidative reaction.The thermal analyses of TG and DTA were employed to determine the thermal decomposition properties of ester oils trimethylolpropane trioleate(TMPTO)with butyl-octyl-diphenylamine/octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate/amine-phenol combination antioxidant.The activation energy of the lubricating oil adding antioxidant is increased relative to the TMPTO base oil,and the order of activation energy are Ec(93.732 kJ·mol^(-1))>Ed(88.71 kJ·mol^(-1))>Eb(58.41 kJ·mol^(-1))>Ea(46.32 kJ·mol^(-1)).The experimental results show that octadecyl 3-(3,5-di-tert-butyl-4-hydroxyphenyl)propanoate in TMPTO has favorable resistance to thermal oxidation and decomposition.The thermal analysis method of DSC accurately reflects the heat exchange of lubricant thermal-oxidative reaction.The order of activation energy is calculated to ED(144.385 kJ·mol^(-1))>EC(110.05 kJ·mol^(-1))>EB(97.187 kJ·mol^(-1))>EA(66.02 kJ·mol^(-1)).It is illustrated that the amine-phenol combination antioxidant has the best thermal oxidation resistance,which is the same as what the oxidation onset temperature effected. 展开更多
关键词 thermal oxidative degradation thermal kinetics ANTIOXIDANTS trimethylolpropane oleate
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The degradation of organophosphorus pesticides by means of sodium percarbonate 被引量:2
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作者 QIAN Hui ZHAO Qi-hong +1 位作者 YANG Xiao-di Li Lai-fa 《Journal of Chemistry and Chemical Engineering》 2008年第4期13-19,共7页
The factors and mechanisms of oxidative degradation of three organophosphorus pesticides (dichlorvos, methamidophos and phoxim) were studied with sodium percarbonate (SPC) as a solid oxidant. The result showed tha... The factors and mechanisms of oxidative degradation of three organophosphorus pesticides (dichlorvos, methamidophos and phoxim) were studied with sodium percarbonate (SPC) as a solid oxidant. The result showed that SPC has highly activity in degrading these organophosphous pesticides. The most efficient degradation of pesticides occurred under basic conditions and the degradation rates increased with time extension and high temperature. The degradation of organophosphorus pesticides was expected to get even better results at lower initial concentration. Furthermore, we analyzed the intermediate products by NMP, spectrometry. On the basis of the analytical result, the oxidative degradation mechanism was proposed for each organophosphous pesticide. It is significant to understand the environment chemistry of organophosphorus pesticides in environmental system. 展开更多
关键词 oxidative degradation sodium percarbonate organophosphorus pesticides
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Efficient oxidative degradation of 2-chlorophenol and 4-chlorophenol over supported CuO-based catalysts 被引量:1
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作者 Jingjing Li Yang Hu +6 位作者 Wenhui Lu Lei Shi Qi Sun Yonggang Zhou Jianfeng Xu Jian Wang Bizhong Shen 《Journal of Natural Gas Chemistry》 EI CAS CSCD 2011年第5期493-497,共5页
A series of metal oxide catalysts for catalytic oxidative degradation of 2-chlorophenol (2-CP) and 4-chlorophenol (4-CP) were prepared, and the supported CuO catalysts were studied particularly. The supported CuO ... A series of metal oxide catalysts for catalytic oxidative degradation of 2-chlorophenol (2-CP) and 4-chlorophenol (4-CP) were prepared, and the supported CuO catalysts were studied particularly. The supported CuO catalysts were characterized by XRD and NH3-TPD techniques, in which CuO/γ-Al2O3 exhibited high degradation activity. The addition of Na2O or K2O into CuO/γ-Al2O3 improved the oxidative degradation of CPs remarkably, in which Na2O was more efficient than K2O. Over CuO/γ-Al2O3-Na2O, CPs were completely converted and the liberation of the inorganic chloride from 2-CP or 4-CP reached 97% or 100% respectively at 30 ?C for 2 h. The supported CuO catalysts with good dispersion of CuO particles and less acid sites were favorable for the efficient oxidative degradation of CPs. In addition, the initial pH of the reaction solution was found to be an important factor which influenced the catalytic oxidative degradation of CPs and the initial pH of 11.2 and 9.8 was preferred for the oxidative degradation of 2-CP and 4-CP respectively over CuO/γ-Al2O3 catalyst. 展开更多
关键词 CUO/Γ-AL2O3 NA2O K2O CHLOROPHENOL oxidative degradation
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Hemin Based Biomimetic Oxidative Degradation of Acid Orange 7 被引量:1
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作者 Mei Yan Huifang Xie +3 位作者 Qing Zhang Hongxia Qu Jinyou Shen Jinming Kong 《Journal of Materials Science and Chemical Engineering》 2016年第6期26-34,共9页
Degradation of dyes is an important environmental issue. In order to avoid the carcinogenic risks in anaerobic-aerobic biological process for wastewater containing azo dyes, a hemin based biomimetic oxidative degradat... Degradation of dyes is an important environmental issue. In order to avoid the carcinogenic risks in anaerobic-aerobic biological process for wastewater containing azo dyes, a hemin based biomimetic oxidative degradation of azo dyes was developed. Acid orange 7 (AO7) was selected as the model for azo dye and the high efficient degradation was achieved in hemin/H2O2 system at pH 11.0. Degradation could be described by a pseudo-first-order kinetic model. The order of dependence on H2O2 concentration was significantly larger than that of hemin. Coexisting anions sulphate and chloride had little effect on the degradation, but reductive sulphite dramatically inhibited the degradation. The protic solvent 2-prophanol obviously promoted the degradation. Azo chromogenic group was destroyed quickly and some smaller intermediates formed. Active species oxoferryl porphyrin p-cation radical +PFeIV=O generated from heterolytic cleavage of O-O in H2O2 catalyzed by hemin play the main roles in degradation and reaction pathways were proposed. 展开更多
关键词 Biomimetic Oxidative degradation Azo Dyes HEMIN
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Oxidative Degradation of 2,4,6-Trichlorophenolin the Presence of Air Ions
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作者 Hui Min MA Jens WOHLERS +3 位作者 Uwe MEIERHENRICH Axel BERNECKER Vera SULING Wolfram THIEMANN 《Chinese Chemical Letters》 SCIE CAS CSCD 2001年第3期211-214,共4页
2,4,6-trichlorophenol (TCP) was firstly treated with air ions generated by electric discharge, and high dechlorination (53%) was observed after 60 min treatment, indicating that air ions are an efficient dechlorinatio... 2,4,6-trichlorophenol (TCP) was firstly treated with air ions generated by electric discharge, and high dechlorination (53%) was observed after 60 min treatment, indicating that air ions are an efficient dechlorination means and might have a future in the oxidative removal of chlorinated phenols. In addition, a stepwise degradation of TCP, beginning with the formation of a major product 2,6-dichloro-1,4-benzenediol via substitution, is proposed through a detailed analysis of gas chromatography/mass spectrometry. 展开更多
关键词 2 4 6-TRICHLOROPHENOL air ions electric discharge oxidative degradation pollutant treatment
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Oxidation Degradation of Aqueous Carbofuran Induced by Low Temperature Plasma
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作者 蒲陆梅 高锦章 +3 位作者 虎玉森 梁慧光 肖雯 王兴民 《Plasma Science and Technology》 SCIE EI CAS CSCD 2008年第3期348-351,共4页
The oxidative degradation of aqueous carbofuran, a heavily used toxic carbamate insecticide by low temperature plasma, was investigated. The results show that the treatment efficiency increases with the increase in in... The oxidative degradation of aqueous carbofuran, a heavily used toxic carbamate insecticide by low temperature plasma, was investigated. The results show that the treatment efficiency increases with the increase in initial concentration. Raising the treatment temperature and changing the pH value can result in enhanced degradation of carbofuran in solution. The results also show that low temperature plasma treatment can effectively remove chemical oxygen demand (COD) of carbofuran in the solution. 展开更多
关键词 CARBOFURAN low temperature plasma oxidative degradation
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OXIDATIVE DEGRADATION OF BILIVERDIN AND BILIRUBIN ESTERS IN PRESENCE OF SILVER NITRATE
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作者 Jin Shi MA Chang Qi WANG Fang YAN Yong Yong LIU Jin Hua CHEN Institute of Photographic Chemistry,Academia Sinica,Beijing 100012 《Chinese Chemical Letters》 SCIE CAS CSCD 1990年第1期39-40,共2页
Treatment of biliverdin IXα dimethyl ester(2)with silver nitrate in alkaline solution gave two violin-like tripyrrione carbaldehydes,one de- graded at C15-C16,other at C4-C5.Biliverdin IXα(1),bilirubin IXα(3)and it... Treatment of biliverdin IXα dimethyl ester(2)with silver nitrate in alkaline solution gave two violin-like tripyrrione carbaldehydes,one de- graded at C15-C16,other at C4-C5.Biliverdin IXα(1),bilirubin IXα(3)and its dimethyl ester(4)gave the same results. 展开更多
关键词 OXIDATIVE degradation OF BILIVERDIN AND BILIRUBIN ESTERS IN PRESENCE OF SILVER NITRATE ABX
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Mediated electron transfer process in α-MnO_(2)catalyzed Fenton-like reaction for oxytetracycline degradation
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作者 Yiqian Jiang Zihan Yang +3 位作者 Xiuru Bi Nan Yao Peiqing Zhao Xu Meng 《Chinese Chemical Letters》 SCIE CAS CSCD 2024年第8期367-372,共6页
In Fenton-like oxidation,the catalyst directly influences the reaction mechanism for the degradation of pollutants from water.Here,a α-MnO_(2)catalyst(OAm-1)was synthesized via a self-assembly method with the assista... In Fenton-like oxidation,the catalyst directly influences the reaction mechanism for the degradation of pollutants from water.Here,a α-MnO_(2)catalyst(OAm-1)was synthesized via a self-assembly method with the assistance of a surfactant.OAm-1 possessed a large specific surface area of_(2)21 m2/g,abundant mesoporous structures and a large proportion of Mn(III).Further characterization exhibited that OAm-1 had abundant oxygen vacancies and excellent reducibility and conductivity.The adsorption and catalytic ability of OAm-1 were studied in the degradation of oxytetracycline(OTC)via the activation of hydrogen peroxide(H_(2)O_(2)).Through the radical quenching experiments,electron resonance spectroscopy(EPR),X-ray photoelectron spectroscopy(XPS)and Fourier-transform infrared spectroscopy(FT-IR)analysis,Mn(III)of OAm-1 was proved to be the active sites for the chemisorption of OTC.Systematic electrochemical ex-periments and analysis have shown that a process of electron transfer mediated by OAm-1 occurred be-tween the pollutant and H_(2)O_(2)during a Fenton-like reaction.This work experimentally verifies the elec-tron transfer process dominated nonradical mechanism overα-MnO_(2),which is helpful for understanding the catalytic mechanism of the Fenton-like oxidation. 展开更多
关键词 Mediated electron transfer Hydrogen peroxide Oxidative degradation Manganese oxide Fenton oxidation
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The relationship between oxidative degradation and ammonia emission of carbon capture amines based on their chemical structures
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作者 Pailin Muchan Teeradet Supap +1 位作者 Jessica Narku-Tetteh Supranee Lisawadi 《Clean Energy》 EI CSCD 2024年第1期134-152,共19页
This work investigates the effect of chemical structural positioning of different functional groups in 29 amines covering primary,secondary and tertiary alkanolamines as well as multi-alkylamines and cyclic amines on ... This work investigates the effect of chemical structural positioning of different functional groups in 29 amines covering primary,secondary and tertiary alkanolamines as well as multi-alkylamines and cyclic amines on both amine degradation and ammonia(NH_(3))emissions during post-combustion amine-based carbon dioxide capture.The results helped to elucidate possible relation-ships between degradation and emissions as related to the chemical structure of the amine.The results showed that longer alkyl chain lengths in multi-alkylamines caused a more drastic decrease in both degradation and NH_(3) emissions followed by secondary alkanolamines.The decrease in those activities for primary and tertiary alkanolamines as well as cyclic amines was low and more so for NH_(3) emissions.In contrast,the increase in hydroxyl groups in secondary alkanolamines caused a drastic increase in degrad-ation and NH_(3) emissions.On the other hand,having more hydroxyl groups in sterically hindered primary and tertiary alkanolamines caused a more drastic decrease in degradation and a smaller decrease in NH_(3) emissions due to the steric hindrance within their structure.An increase in the number of amino groups in an amine caused an increase in both degradation and NH_(3) emission rates because these provided the reactive sites for the formation of free radicals.This effect was not as large in alkyl-cyclic amines as in multi-alkylamines due to the ability of the former to resist oxidative degradation.Furthermore,branched alkyl groups between amino and hydroxyl groups more drastically increased both the degradation and NH_(3) emission activities than branched alkyl groups located at the nitrogen atom. 展开更多
关键词 amine degradation rate ammonia emission rate carbon capture amine structure oxidative degradation AMINES
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Recent advances in phosphoric acid-based membranes for high-temperature proton exchange membrane fuel cells 被引量:3
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作者 Zunmin Guo Maria Perez-Page +2 位作者 Jianuo Chen Zhaoqi Ji Stuart M.Holmes 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2021年第12期393-429,I0010,共38页
High-temperature proton exchange membrane fuel cells(HT-PEMFCs)are pursued worldwide as efficient energy conversion devices.Great efforts have been made in the area of designing and developing phosphoric acid(PA)-base... High-temperature proton exchange membrane fuel cells(HT-PEMFCs)are pursued worldwide as efficient energy conversion devices.Great efforts have been made in the area of designing and developing phosphoric acid(PA)-based proton exchange membrane(PEM)of HT-PEMFCs.This review focuses on recent advances in the limitations of acid-based PEM(acid leaching,oxidative degradation,and mechanical degradation)and the approaches mitigating the membrane degradation.Preparing multilayer or polymers with continuous network,adding hygroscopic inorganic materials,and introducing PA doping sites or covalent interactions with PA can effectively reduce acid leaching.Membrane oxidative degradation can be alleviated by synthesizing crosslinked or branched polymers,and introducing antioxidative groups or highly oxidative stable materials.Crosslinking to get a compact structure,blending with stable polymers and inorganic materials,preparing polymer with high molecular weight,and fabricating the polymer with PA doping sites away from backbones,are recommended to improve the membrane mechanical strength.Also,by comparing the running hours and decay rate,three current approaches,1.crosslinking via thermally curing or polymeric crosslinker,2.incorporating hygroscopic inorganic materials,3.increasing membrane layers or introducing strong basic groups and electron-withdrawing groups,have been concluded to be promising approaches to improve the durability of HT-PEMFCs.The overall aim of this review is to explore the existing degradation challenges and opportunities to serve as a solid basis for the deployment in the fuel cell market. 展开更多
关键词 High-temperature proton exchange membrane fuel cells Acid leaching Oxidative degradation Mechanical degradation DURABILITY
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Novel-structured Mo-Cu-Fe-O composite for catalytic air oxidation of dye-containing wastewater under ambient temperature and pressure 被引量:3
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作者 Yin Xu Henan Shao +1 位作者 Fei Ge Yun Liu 《Chinese Journal of Catalysis》 CSCD 北大核心 2017年第10期1719-1725,共7页
A novel‐structured Mo‐Cu‐Fe‐O composite was successfully prepared by co‐precipitation and impregnation method.The properties of the as‐prepared samples were determined using X‐ray diffraction,temperature‐progr... A novel‐structured Mo‐Cu‐Fe‐O composite was successfully prepared by co‐precipitation and impregnation method.The properties of the as‐prepared samples were determined using X‐ray diffraction,temperature‐programmed reduction by H2,cyclic voltammetry,and temperature‐programmed desorption by O2.The results showed that Mo6+diffused into the Cu‐Fe‐O crystal lattice and then formed a new crystalline phase of CuMoO4.The Mo‐Cu‐Fe‐O catalyst had redox properties,and its surface contained active sites for oxygen adsorption.In addition,the catalytic activity of the Mo‐Cu‐Fe‐O composite was evaluated by the degradation of Cationic Red GTL,Crystal Violet,and Acid Red in catalytic wet air oxidation(CWAO)at ambient temperature and pressure.The Mo‐Cu‐Fe‐O catalyst showed excellent activity at basic conditions for the degradation of Cationic Red GTL.High removal efficiencies of91.5%and92.8%were achieved for Cationic Red GTL and Crystal Violet,respectively,in wastewater,and the efficiency remained high after seven cycles.However,almost no degradation of Acid Red occurred in the CWAO process.Furthermore,hydroxyl radicals were formed in the CWAO process,which induced the decomposition of the two cationic dyes in wastewater,and the toxicity of their effluents was decreased after degradation.The results indicate that the Mo‐Cu‐Fe‐O composite shows excellent catalytic activity for the treatment of wastewater contaminated with cationic dyes. 展开更多
关键词 Mo‐Cu‐Fe‐O catalyst Ambient temperature and pressure Dye wastewater Hydroxyl radical Oxidative degradation
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Ozonation of o-phenylenediamine in the presence of hydrogen peroxide by high-gravity technology 被引量:2
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作者 Moses Arowo Zemeng Zhao +3 位作者 Guangjun Li Guangwen Chu Baochang Sun Lei Shao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2018年第3期601-607,共7页
The study herein investigated the effectiveness of simultaneous use of ozone and hydrogen peroxide(O_3/H_2O_2 process) to degrade o-phenylenediamine(o-PDA) in a simulated wastewater. A rotor–stator reactor(RSR) was e... The study herein investigated the effectiveness of simultaneous use of ozone and hydrogen peroxide(O_3/H_2O_2 process) to degrade o-phenylenediamine(o-PDA) in a simulated wastewater. A rotor–stator reactor(RSR) was employed to create a high-gravity environment in order to enhance ozone-liquid mass transfer rate and possibly improve the degradation rate of o-PDA. The degradation efficiency of o-PDA(η) as well as the overall gas-phase volumetric mass transfer coefficient(KGa) were determined under different operating conditions of H_2O_2 concentration, initial o-PDA concentration, temperature of reaction, initial p H and rotation speed of RSR in attempt to establish the optimal conditions. Chemical oxygen demand reduction rate(rCOD) of wastewater treated at a particular set of conditions was also analyzed. Additionally, the intermediate products of degradation were identified using a gas chromatography-mass spectrometer(GC/MS) to further evaluate the extent of o-PDA degradation as well as establish its possible degradation pathway. Results were validated by comparison with those of sole use of ozone(O_3 process), and it was noted that η, KGa and rCODachieved by O_3/H_2O_2 process was 24.4%,31.6% and 25.2% respectively higher than those of O_3 process, indicating that H_2O_2 can greatly enhance ozonation of o-PDA. This work further demonstrates that an RSR can significantly intensify ozone-liquid mass transfer rate and thus provides a feasible intensification means for the ozonation of o-PDA as well as other recalcitrant organics. 展开更多
关键词 degradation Environment Organic compounds Oxidation Ozone Rotor-stator reactor
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Modeling of trap-assisted tunneling on performance of charge trapping memory with consideration of trap position and energy level
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作者 伦志远 李云 +3 位作者 赵凯 杜刚 刘晓彦 王漪 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第8期447-451,共5页
In this work, the trap-assisted tunneling(TAT) mechanism is modeled as a two-step physical process for charge trapping memory(CTM). The influence of the TAT mechanism on CTM performance is investigated in consider... In this work, the trap-assisted tunneling(TAT) mechanism is modeled as a two-step physical process for charge trapping memory(CTM). The influence of the TAT mechanism on CTM performance is investigated in consideration of various trap positions and energy levels. For the simulated CTM structure, simulation results indicate that the positions of oxide traps related to the maximum TAT current contribution shift towards the substrate interface and charge storage layer interface during time evolutions in programming and retention operations, respectively. Lower programming voltage and retention operations under higher temperature are found to be more sensitive to tunneling oxide degradation. 展开更多
关键词 trap assisted tunneling charge trapping memory tunneling oxide degradation
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Study on the Synergistic Catalytic Oxidation of Landfill Leachate by O3 /H2O2 System
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作者 Teng Lihua Wang Chenyi Wang Jianping 《Meteorological and Environmental Research》 CAS 2016年第4期56-58,共3页
The characteristics of water quality had significant effects on the oxidative degradation of O_3/H_2O_2 system.In this study,iron supported on activated carbon catalyst was prepared firstly,and then the treatment of l... The characteristics of water quality had significant effects on the oxidative degradation of O_3/H_2O_2 system.In this study,iron supported on activated carbon catalyst was prepared firstly,and then the treatment of landfill leachate by O_3/H_2O_2/catalyst system was analyzed,especially the roles of H_2O_2 in the oxidation of landfill leachate by O_3/H_2O_2 system.The results showed that at room temperature,when the dosage of the catalyst was 1.0g,the removal rate of COD from the landfill leachate reached 79.8% after 50 ml of the landfill leachate(pH=3)was oxidized by O_3(its flow rate was 5g/h)for 50 min.If 0.3ml of H_2O_2 was added to the landfill leachate,the removal rate of COD increased from 79.8%to 88.7%.It showed that the landfill leachate with the characteristics of complex composition and difficult biodegradation could be effectively degraded by the O_3/H_2O_2 system. 展开更多
关键词 Landfill leachate Oxidative degradation O3/H2O2 system China
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Enhancement of Fe3O4/Au Composite Nanoparticles Catalyst in Oxidative Degradation of Methyl Orange Based on Synergistic Effect 被引量:2
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作者 Qin Gao Yan Xing +7 位作者 Mingli Peng Yongshuai Liu Zhiyi Luo Yanyan Jin Haiming Fan Kebin Li Chao Chen Yali Cui 《Chinese Journal of Chemistry》 SCIE CAS CSCD 2017年第9期1431-1436,共6页
Enhancement of Fe3O4/Au nanoparticles (Fe3O4/Au NPs) catalyst was observed in the oxidative degradation of methyl orange by employing H2O2 as oxidant. To evaluate the catalytic activity of Fe3O4/Au nanoparticles, di... Enhancement of Fe3O4/Au nanoparticles (Fe3O4/Au NPs) catalyst was observed in the oxidative degradation of methyl orange by employing H2O2 as oxidant. To evaluate the catalytic activity of Fe3O4/Au nanoparticles, different degradation conditions were investigated such as the amounts of catalyst, H2O2 concentration and pH value. Based on our data, methyl orange was degraded completely in a short time. The enhanced catalytic activity and increased oxidation rate constant may be ascribed to synergistic catalyst-activated decomposition of H2O2 to ,OH radical, which was one of the strong oxidizing species. Besides, Fe3O4/Au nanoparticles have exhibited satisfying recycle performance for potential industrial application. 展开更多
关键词 Fe3O4/Au nanoparticles methyl orange oxidative degradation hydroxyl radicals
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