Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes, UV/Fe3+ and electrocatalysis. The enhancement of removal rate for p-nitrophenol and COD was aroun...Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes, UV/Fe3+ and electrocatalysis. The enhancement of removal rate for p-nitrophenol and COD was around 123% and 278%, respectively. The possible contributions for the synergetic effects were the electrochemically regeneration of ferric ion and the role of the oxygen that formed on the anode.展开更多
In this paper, the stereoselective homogeneous catalysis polymerization of phenylacetylene by using two kinds of catalysts W(CO)_5CH_3I and W(CO)_4I_2 produced from UV laser photolysis of W (CO)_6 in CH_3I, I_2—C_6H_...In this paper, the stereoselective homogeneous catalysis polymerization of phenylacetylene by using two kinds of catalysts W(CO)_5CH_3I and W(CO)_4I_2 produced from UV laser photolysis of W (CO)_6 in CH_3I, I_2—C_6H_6 and CHI_3—C_6H_6 respectively was studied. The effects of laser energy, laser irradiation time and lifetime of catalyst on the polymerization of phenylacetylene were discussed. The photoproducts of W (CO)_6 in CH_3I, I2—C_6H_6 and CHI_3—C_6I_6 were determined by IR spectra. The structures of polyphenylacetylene obtained by W (CO)_5CH_3I and W (CO)_4I_2 catalysts were characterized by IR spectra and ~1H NMR spectra.展开更多
采用UV/H2O2技术对污染水体中的MTBE进行了氧化降解试验,考察了不同MTBE初始浓度,不同H2O2浓度,不同pH值,不同波长的紫外光对降解效果的影响,以及不同Cl-、HCO3-浓度的抑制作用.结果表明,在室温条件下,当紫外光波长为254 nm,H2O2为15 m ...采用UV/H2O2技术对污染水体中的MTBE进行了氧化降解试验,考察了不同MTBE初始浓度,不同H2O2浓度,不同pH值,不同波长的紫外光对降解效果的影响,以及不同Cl-、HCO3-浓度的抑制作用.结果表明,在室温条件下,当紫外光波长为254 nm,H2O2为15 m mol/L,pH为3.0时对起始浓度为1 m mol/L的MTBE具有较好的降解效果;反应60 min,MTBE去除率可达97.6%.实验证明,UV/H2O2氧化技术是降解MTBE的一种有效方法.展开更多
采用UV-Fenton技术光催化氧化高浓度邻苯二甲酸二辛酯(DOP)生产废水,确定最佳操作条件为:初始pH=3.8,H2O2浓度为9.99 g/L,H2O2/Fe2+摩尔比为20∶1,光照反应60 m in。此条件下的废水COD去除率为89.1%,出水COD值在570 mg/L左右。经正交试...采用UV-Fenton技术光催化氧化高浓度邻苯二甲酸二辛酯(DOP)生产废水,确定最佳操作条件为:初始pH=3.8,H2O2浓度为9.99 g/L,H2O2/Fe2+摩尔比为20∶1,光照反应60 m in。此条件下的废水COD去除率为89.1%,出水COD值在570 mg/L左右。经正交试验确定影响处理效果各因素的重要性顺序为:H2O2浓度>H2O2/Fe2+摩尔比>光照反应时间>pH。UV的加入与单独的Fenton体系存在正相关的协同作用。废水降解的表观过程符合一级反应动力学模式。展开更多
Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to develop two novel o...Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to develop two novel organic-inorganic hybrid antimony-based optical materials,(C_(3)H_(5)N_(2))Sb F_(2)SO_(4)(I)and(C_(5)H_(6)N)Sb F_(2)SO_(4)(Ⅱ),which were obtained by introducing Sb^(3+)cation containing stereochemically active lone-pair(SCALP)and organicπ-conjugated cations into sulphate system.The synergistic interactions of the organicπ-conjugated cations,the inorganic[SbO_(2)F_(2)]^(3-)seesaw anions and the[SO_(4)]^(2-)distorted tetrahedra anions make their ultraviolet(UV)absorption edges approach 297 and 283 nm,respectively,and raise their birefringence up to 0.193@546 nm and 0.179@546 nm,respectively.Interestingly,although the two compounds have the same stoichiometric ratio and similar one-dimensional(1D)chain structure,they show opposite macroscopic symmetry,where the NCS compound(Ⅱ)exhibits a large secondharmonic generation(SHG)response(1.6 times that of KH_(2)PO_(4)).The two reported compounds are found to be promising UV optical materials in the experimental tests.展开更多
为了研究满足压载水排放标准的处理系统,建立了可以实现单独控制的以钛基氧化锡钌(Ti/SnO2-RuO2)为阳极材料的电催化系统和紫外辐射复合压载水处理系统。以杜氏盐藻、青岛大扁藻、锥状克里斯普藻和四爿藻为目标处理微生物,对该系统进行...为了研究满足压载水排放标准的处理系统,建立了可以实现单独控制的以钛基氧化锡钌(Ti/SnO2-RuO2)为阳极材料的电催化系统和紫外辐射复合压载水处理系统。以杜氏盐藻、青岛大扁藻、锥状克里斯普藻和四爿藻为目标处理微生物,对该系统进行微藻灭活实验结果表明,Ti/SnO2-RuO2阳极电催化-UV复合系统克服了单独电催化系统高能耗、单独紫外辐射系统紫外灯衰减迅速的缺点,在紫外辐射出度45μW/cm2、电流密度130 m A/cm2、HRT为1.0 s的条件下,处理出水4 h后活藻数量可以达到国际海事组织(IMO)对压载水中10~50μm微生物的灭活要求。总剩余氧化物(TRO)含量会随时间推移而有衰减,且没有出现细胞光复活和修复现象,说明该复合系统具有理想的持续灭活作用。展开更多
Single-atom catalysts(SACs)are gaining increasing recognition because of their superior catalytic properties for various reactions.However,the performance of SACs is often limited by the lack of neighboring metal cent...Single-atom catalysts(SACs)are gaining increasing recognition because of their superior catalytic properties for various reactions.However,the performance of SACs is often limited by the lack of neighboring metal centers to cooperate in catalysis.Herein,a synergetic interaction between neighboring Cu atoms of a few-atom catalyst(FAC)on graphdiyne(GDY)is found to greatly enhance the production of acetate in the CO electroreduction reaction relative to Cu SACs.In a 1.0 M KOH electrolyte,this Cu FAC exhibits an acetate Faradaic efficiency of 53.8±1.5%,an ultrahigh relative purity of up to 97 wt%for liquid products,and excellent stability over 23 h continuous electrolysis at–0.8 V versus reversible hydrogen electrode.Theoretical studies suggest that the intersite catalytic communication between two neighboring metal atoms confined in each pore of GDY facilitates the formation of acetic acid through either stepwise hydrogenation of CH_(2)CO^(*)or the direct reaction of H_(2)Owith CH_(2)CO^(*).Our study demonstrates the unprecedented synergetic catalysis of Cu FAC in promoting the selective CO electroreduction toward acetate production.展开更多
The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized an...The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized and tested in NH 3-Selective catalytic reduction（SCR） of NO,and the samples were characterized by the Brunaller,Emmett and Teller（BET absorbed gas N 2）,X-ray diffraction（XRD）,high resolution transmission electron microscopy（HR-TEM）,and temperature programmed desorption（TPD NH 3） techniques.The improvement mechanism of the interaction between the titania and ceria had been explored and discussed from two aspects of micro-structure and surface acidity.The interaction between the titania and ceria greatly improved the catalytic activity but had little effect on the active temperature.It was first reported that the acid amount determined the catalytic activity and the acid strength determined the active temperature for NH 3-SCR of NO.展开更多
Fine particles of zinc-cerium oxides （ZCO） used as an ultraviolet filter were prepared via combustion synthesis route. The catalytic activity, UV-shielding performance, surface modification and application of ZCO in...Fine particles of zinc-cerium oxides （ZCO） used as an ultraviolet filter were prepared via combustion synthesis route. The catalytic activity, UV-shielding performance, surface modification and application of ZCO in polyester varnish were discussed in detail. The experimental results indicate that the photo-catalytic activity of ZCO is much smaller than these of ZnO and TiO2; the oxidation catalytic activity of ZCO is far lower than that of CeO2; the ZCO has shown excellent ultraviolet absorption in the range of UV; addition modified ZCO （MZCO） into polyester will enhance the UV-shielding capability of polyester.展开更多
文摘Synergetic effects for p-nitrophenol degradation were observed in the combination of two-advanced oxidation processes, UV/Fe3+ and electrocatalysis. The enhancement of removal rate for p-nitrophenol and COD was around 123% and 278%, respectively. The possible contributions for the synergetic effects were the electrochemically regeneration of ferric ion and the role of the oxygen that formed on the anode.
文摘In this paper, the stereoselective homogeneous catalysis polymerization of phenylacetylene by using two kinds of catalysts W(CO)_5CH_3I and W(CO)_4I_2 produced from UV laser photolysis of W (CO)_6 in CH_3I, I_2—C_6H_6 and CHI_3—C_6H_6 respectively was studied. The effects of laser energy, laser irradiation time and lifetime of catalyst on the polymerization of phenylacetylene were discussed. The photoproducts of W (CO)_6 in CH_3I, I2—C_6H_6 and CHI_3—C_6I_6 were determined by IR spectra. The structures of polyphenylacetylene obtained by W (CO)_5CH_3I and W (CO)_4I_2 catalysts were characterized by IR spectra and ~1H NMR spectra.
文摘采用UV/H2O2技术对污染水体中的MTBE进行了氧化降解试验,考察了不同MTBE初始浓度,不同H2O2浓度,不同pH值,不同波长的紫外光对降解效果的影响,以及不同Cl-、HCO3-浓度的抑制作用.结果表明,在室温条件下,当紫外光波长为254 nm,H2O2为15 m mol/L,pH为3.0时对起始浓度为1 m mol/L的MTBE具有较好的降解效果;反应60 min,MTBE去除率可达97.6%.实验证明,UV/H2O2氧化技术是降解MTBE的一种有效方法.
文摘采用UV-Fenton技术光催化氧化高浓度邻苯二甲酸二辛酯(DOP)生产废水,确定最佳操作条件为:初始pH=3.8,H2O2浓度为9.99 g/L,H2O2/Fe2+摩尔比为20∶1,光照反应60 m in。此条件下的废水COD去除率为89.1%,出水COD值在570 mg/L左右。经正交试验确定影响处理效果各因素的重要性顺序为:H2O2浓度>H2O2/Fe2+摩尔比>光照反应时间>pH。UV的加入与单独的Fenton体系存在正相关的协同作用。废水降解的表观过程符合一级反应动力学模式。
基金supported by the National Natural Science Foundation of China(Nos.22122106,22071158,21971171,22305166)the Fundamental Research Funds from Sichuan University(No.2021SCUNL101)the Natural Science Foundation of Sichuan Province(No.2023NSFC1066)。
文摘Finding suitable strategies to effectively enhance the optical properties of materials are the goal being pursued by researchers.Herein,cation-anion synergetic interactions strategy was proposed to develop two novel organic-inorganic hybrid antimony-based optical materials,(C_(3)H_(5)N_(2))Sb F_(2)SO_(4)(I)and(C_(5)H_(6)N)Sb F_(2)SO_(4)(Ⅱ),which were obtained by introducing Sb^(3+)cation containing stereochemically active lone-pair(SCALP)and organicπ-conjugated cations into sulphate system.The synergistic interactions of the organicπ-conjugated cations,the inorganic[SbO_(2)F_(2)]^(3-)seesaw anions and the[SO_(4)]^(2-)distorted tetrahedra anions make their ultraviolet(UV)absorption edges approach 297 and 283 nm,respectively,and raise their birefringence up to 0.193@546 nm and 0.179@546 nm,respectively.Interestingly,although the two compounds have the same stoichiometric ratio and similar one-dimensional(1D)chain structure,they show opposite macroscopic symmetry,where the NCS compound(Ⅱ)exhibits a large secondharmonic generation(SHG)response(1.6 times that of KH_(2)PO_(4)).The two reported compounds are found to be promising UV optical materials in the experimental tests.
文摘为了研究满足压载水排放标准的处理系统,建立了可以实现单独控制的以钛基氧化锡钌(Ti/SnO2-RuO2)为阳极材料的电催化系统和紫外辐射复合压载水处理系统。以杜氏盐藻、青岛大扁藻、锥状克里斯普藻和四爿藻为目标处理微生物,对该系统进行微藻灭活实验结果表明,Ti/SnO2-RuO2阳极电催化-UV复合系统克服了单独电催化系统高能耗、单独紫外辐射系统紫外灯衰减迅速的缺点,在紫外辐射出度45μW/cm2、电流密度130 m A/cm2、HRT为1.0 s的条件下,处理出水4 h后活藻数量可以达到国际海事组织(IMO)对压载水中10~50μm微生物的灭活要求。总剩余氧化物(TRO)含量会随时间推移而有衰减,且没有出现细胞光复活和修复现象,说明该复合系统具有理想的持续灭活作用。
基金supported by the National Natural Science Foundation of China(grant nos.21771098,21903016,and 21901110)Shenzhen R&D Fund(grant no.KQTD20180411143418361)+2 种基金Stable Support Plan Program of Shenzhen Natural Science Fund(grant no.20200925152742003)and Educational Commission of Guangdong Province(grant no.2020KTSCX121)S.T.and E.H.are supported by the Assistant Secretary for Energy Efficiency and Renewable Energy,Vehicle Technology Office of the US Department of Energy(DOE)through the Advanced Battery Materials Research(BMR)Program under contract no.DE-SC0012704.
文摘Single-atom catalysts(SACs)are gaining increasing recognition because of their superior catalytic properties for various reactions.However,the performance of SACs is often limited by the lack of neighboring metal centers to cooperate in catalysis.Herein,a synergetic interaction between neighboring Cu atoms of a few-atom catalyst(FAC)on graphdiyne(GDY)is found to greatly enhance the production of acetate in the CO electroreduction reaction relative to Cu SACs.In a 1.0 M KOH electrolyte,this Cu FAC exhibits an acetate Faradaic efficiency of 53.8±1.5%,an ultrahigh relative purity of up to 97 wt%for liquid products,and excellent stability over 23 h continuous electrolysis at–0.8 V versus reversible hydrogen electrode.Theoretical studies suggest that the intersite catalytic communication between two neighboring metal atoms confined in each pore of GDY facilitates the formation of acetic acid through either stepwise hydrogenation of CH_(2)CO^(*)or the direct reaction of H_(2)Owith CH_(2)CO^(*).Our study demonstrates the unprecedented synergetic catalysis of Cu FAC in promoting the selective CO electroreduction toward acetate production.
基金supported by National Natural Science Foundation of China (21106071 and 50872052)National High-Tech Research and Development Program of China (863 Program,2009AA05Z313)+1 种基金New Teachers' Fund for Doctor Stations the Ministry of Education of China(20113221120004)Research Subject of Environmental Protection Department of Jiangsu Province of China (201016)
文摘The promotional effect of the interaction between titania and ceria on the catalytic performance for selective reduction of NO was studied.The catalysts,CeO 2,TiO 2,CeO 2 /TiO 2 and Ti x Ce 1-x O 2,were synthesized and tested in NH 3-Selective catalytic reduction（SCR） of NO,and the samples were characterized by the Brunaller,Emmett and Teller（BET absorbed gas N 2）,X-ray diffraction（XRD）,high resolution transmission electron microscopy（HR-TEM）,and temperature programmed desorption（TPD NH 3） techniques.The improvement mechanism of the interaction between the titania and ceria had been explored and discussed from two aspects of micro-structure and surface acidity.The interaction between the titania and ceria greatly improved the catalytic activity but had little effect on the active temperature.It was first reported that the acid amount determined the catalytic activity and the acid strength determined the active temperature for NH 3-SCR of NO.
基金the Nation Ministry Education Scientific Research Fund for Study Abroad Returnee([2004]527)
文摘Fine particles of zinc-cerium oxides （ZCO） used as an ultraviolet filter were prepared via combustion synthesis route. The catalytic activity, UV-shielding performance, surface modification and application of ZCO in polyester varnish were discussed in detail. The experimental results indicate that the photo-catalytic activity of ZCO is much smaller than these of ZnO and TiO2; the oxidation catalytic activity of ZCO is far lower than that of CeO2; the ZCO has shown excellent ultraviolet absorption in the range of UV; addition modified ZCO （MZCO） into polyester will enhance the UV-shielding capability of polyester.
