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Facile synthesis of composite polyferric magnesium-silicate-sulfate coagulant with enhanced performance in water and wastewater
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作者 Xiangtao Huo Rongxia Chai +2 位作者 Lizheng Gou Mei Zhang Min Guo 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2024年第3期574-584,共11页
The coagulation process is a widely applied technology in water and wastewater treatment.Novel composite polyferric mag-nesium-silicate-sulfate(PFMS)coagulants were synthesized using Na_(2)SiO_(3)·9H_(2)O,Fe_(2)(... The coagulation process is a widely applied technology in water and wastewater treatment.Novel composite polyferric mag-nesium-silicate-sulfate(PFMS)coagulants were synthesized using Na_(2)SiO_(3)·9H_(2)O,Fe_(2)(SO_(4))_(3),and MgSO_(4) as raw materials in this paper.The effects of aging time,Fe:Si:Mg,and OH:M molar ratios(M represents the metal ions)on the coagulation performance of the as-pre-pared PFMS were systematically investigated to obtain optimum coagulants.The results showed that PFMS coagulant exhibited good co-agulation properties in the treatment of simulated humic acid-kaolin surface water and reactive dye wastewater.When the molar ratio was controlled at Fe:Si:Mg=2:2:1 and OH:M=0.32,the obtained PFMS presented excellent stability and a high coagulation efficiency.The removal efficiency of ultraviolet UV254 was 99.81%,and the residual turbidity of the surface water reached 0.56 NTU at a dosage of 30 mg·L^(-1).After standing the coagulant for 120 d in the laboratory,the removal efficiency of UV254 and residual turbidity of the surface wa-ter were 88.12%and 0.68 NTU,respectively,which accord with the surface water treatment requirements.In addition,the coagulation performance in the treatment of reactive dye wastewater was greatly improved by combining the advantages of magnesium and iron salts.Compared with polyferric silicate-sulfate(PFS)and polymagnesium silicate-sulfate(PMS),the PFMS coagulant played a better decolor-ization role within the pH range of 7-13. 展开更多
关键词 polyferric-magnesium-silicate-sulfate composite coagulants water and wastewater excellent stability high coagulation ef-ficiency DECOLORIZATION
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Preparation and decolorization of sapindus mukurossi extract and its application in sebum-control shampoos
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作者 Kaibo Wan Ling Ma +4 位作者 Diansong Chen Zhizhen Li Christos C.Zouboulis Kuan Chang Jing Wang 《Journal of Dermatologic Science and Cosmetic Technology》 2024年第2期1-8,共8页
Background:Sapindus mukurossi extract(SME)is a kind of natural surface active ingredient with potential applications in cleansing products.However,the polyphenols and pigments contained in the extract may cause color ... Background:Sapindus mukurossi extract(SME)is a kind of natural surface active ingredient with potential applications in cleansing products.However,the polyphenols and pigments contained in the extract may cause color browning of the products during storage especially at elevated temperatures,affecting its high level addition in the products.Objective:To explore a decolorization process suitable for industrialization realize the high level addition of SME and explore the potential of SME in the field of controlling sebum esters.Materials and Methods:SME was prepared by adsorbing polyphenols on the D301 resin and oxidation decoloring oxidation.Investigated its sebum-control efficacy by SZ95 model and clinical study.Results:The results demonstrate that the D301 resin displays the best adsorption selectivity for polyphenols in SME,and the polyphenol adsorption ratio of D301 resin(5 wt%)can reach 83.6%;The optimal decolorization conditions are pH=7.8,temperature 73℃and decolorization time 5.7 h when H2O2 content is 6%,The prepared SME shows no obvious changes in color and retain stable during the high temperature(50℃)test period of 28 days.4μg/mL of SME decreases the lipid synthesis of SZ95 cells by 24.8%.The clinic efficacy of the shampoo containing 10%SME(by dry extract weigh)is further evaluated.No significant changes in the skin moisture content and transepidermal water loss(TEWL)are observed within four weeks after using the product,while the scalp sebum level is significantly reduced.Conclusion:In this study,we prepared a light-colored,highly stable SME,enabled its high-level addition in cleansing and care products and found its sebum-control efficacy. 展开更多
关键词 Sapindus mukurossi extract Resin adsorption Oxidative decolorization Sebum-control
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Preparation and photocatalytic performance of porous ZnO microrods loaded with Ag 被引量:4
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作者 贾志刚 彭宽宽 +1 位作者 李艳华 诸荣孙 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第4期873-878,共6页
Porous silver-modified ZnO microrods photocatalysts were synthesized through direct thermal decomposition of the Ag-doped zinctartrate precursor,which was prepared by homogeneous precipitation method at 80 °C for... Porous silver-modified ZnO microrods photocatalysts were synthesized through direct thermal decomposition of the Ag-doped zinctartrate precursor,which was prepared by homogeneous precipitation method at 80 °C for 2 h.The obtained samples were characterized by XRD,FTIR,TG?DTA and UV-VIS absorption spectroscopy.The photocatalytic activity of the as-prepared porous Ag/ZnO microrods was tested with the photocatalytic degradation of methyl orange.The results indicate that doping Ag greatly improves the photocatalytic efficiency of ZnO and 3% Ag-doped(mole fraction) ZnO porous microrod photocatalyst exhibits the highest photocatalytic decolorization efficiency,leading to as much as 80% reduction of MO concentration in 120 min.Moreover,the 3% Ag-doped porous microrods also possess higher photocatalytic activity under the real sunlight irradiation. 展开更多
关键词 Ag/ZnO porous material photocatalytic performance DECOLORATION
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Screening of One Microbial Flocculant for Treatment of Methyl Orange Wastewater and its Decolorization Effect 被引量:6
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作者 张蔚萍 严平 +2 位作者 孙德四 王晓倩 侯梦然 《Agricultural Science & Technology》 CAS 2011年第12期1929-1931,共3页
[Objective] To screen out a microbial flocculant with good decolorization effect on methyl orange wastewater,and study the effect of different cultural conditions on decolorization effect of methyl orange.[Method] Abs... [Objective] To screen out a microbial flocculant with good decolorization effect on methyl orange wastewater,and study the effect of different cultural conditions on decolorization effect of methyl orange.[Method] Absorbance of methyl orange solution before and after decolorization was determined by spectrophotometer,and the decolorization rate was calculated to compare the effects of different cultural conditions on removal rate of methyl orange.[Result]An optimal actinomycete stain(F-1-2) was screened out,and the best cultural condition was as follows:with sucrose as carbon source and NaNO3 as nitrogen source,cultured in constant temperature oscillator at 150 r/min,30℃ for 72 h.Under the optimal condition,the removal rate against methyl orange could reach 68.4%.[Conclusion]Different culture conditions have great impact on decolorization effect of strain. 展开更多
关键词 Microbial flocculant Optimal condition DECOLORIZATION
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Decarbonization and Decolorization of Large Sapphire Crystals Grown by the Temperature Gradient Technique
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作者 徐军 周国清 +6 位作者 邓佩珍 司继良 钱小波 王银珍 周圣明 周永宗 朱人元 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2006年第2期245-248,共4页
A crystalline sapphire (Al2O3) boule (Ф10 × 80mm^3) grown by the temperature gradient technique (TGT) is a bit colored due to carbon volatilization from the graphite heater at high temperatures and the abs... A crystalline sapphire (Al2O3) boule (Ф10 × 80mm^3) grown by the temperature gradient technique (TGT) is a bit colored due to carbon volatilization from the graphite heater at high temperatures and the absorption of transitional metal inclusions in the raw material. The sapphire becomes colorless and transparent after decolorization and decarbonization in successive annealings in air and hydrogen at high temperatures. The quality, optical transmissivity,and homogeneity of the sapphire are remarkably improved. 展开更多
关键词 SAPPHIRE DECOLORIZATION decarbonization ANNEALING
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Screening of Decolorizing Fungi for Rose Bengal and Water-soluble Colour Paste and Its Decolorization Conditions 被引量:1
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作者 魏宝阳 沈炜 +3 位作者 田云 高国赋 卢向阳 曾秀军 《Agricultural Science & Technology》 CAS 2010年第8期164-168,共5页
The strain No. 2 which was isolated from the soil through enrichment culture was used as the experimental material. It was cultured in liquid medium to research decolorizing effect to Rose Bengal and soluble color pas... The strain No. 2 which was isolated from the soil through enrichment culture was used as the experimental material. It was cultured in liquid medium to research decolorizing effect to Rose Bengal and soluble color paste under the different conditions of different media,carbon sources,nitrogen sources,initial pH values and culture temperatures. The results revealed that the optimum decolorizing conditions were using bean juice medium and PDA medium as the minimal medium,sucrose as the carbon source,and ammonium nitrate as the nitrogen source,initial pH 6.0-8.0. In addition,the strain was primarily identified as Aspergillus flavus according to its morphous and ITS sequence analysis. 展开更多
关键词 ITS sequence DYESTUFF DECOLORIZATION Aspergillus flavus
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Decolorization of reactive dyes by laccase immobilized in alginate/gelatin blent with PEG 被引量:15
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作者 WANG, Ping FAN, Xuerong +2 位作者 CUI, Li WANG, Qiang ZHOU, Aihui 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第12期1519-1522,共4页
To achieve effective decolorization of reactive dyes,laccase immobilization was investigated.Laccase 0.2%(m/V)(Denilite IIS) was trapped in beads of alginate/gelatin blent with polyethylene glycol(PEG),and then the su... To achieve effective decolorization of reactive dyes,laccase immobilization was investigated.Laccase 0.2%(m/V)(Denilite IIS) was trapped in beads of alginate/gelatin blent with polyethylene glycol(PEG),and then the supporters were activated by cross-linking with glutaraldehyde.The results of repeated batch decolorization showed that gelatin and appropriate concentration of glutaraldehyde accelerated the decolorization of Reactive Red B-3BF(RRB);PEG had a positive effect on enzyme stability and led to an inc... 展开更多
关键词 DECOLORIZATION reactive dyes LACCASE IMMOBILIZATION ALGINATE GELATIN
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Influence of particle size and salinity on adsorption of basic dyes by agricultural waste: dried Seagrape (Caulerpa lentillifera) 被引量:15
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作者 Pimol Punjongharn Khanidtha Meevasana Prasert Pavasant 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第6期760-768,共9页
Green macroalga Caulerpa lentillifera was found to have reasonable adsorption capacity for basic dyes, Astrazon Blue FGRL (AB), Astrazon Red GTLN (AR), and Astrazon Golden Yellow GL-E (AY). The initial dye conce... Green macroalga Caulerpa lentillifera was found to have reasonable adsorption capacity for basic dyes, Astrazon Blue FGRL (AB), Astrazon Red GTLN (AR), and Astrazon Golden Yellow GL-E (AY). The initial dye concentration was in the range of 100-1,800 mg/L. The dried algal sorbent was ground and sieved into 3 sizes: S (0.1-0.84 mm), M (0.84-2.0 mm), and L sizes (larger than 2.0 mm). For all conditions examined in this work (at 25℃ in batch systems), the adsorption reached equilibrium within the first hour. The kinetic data corresponded well with the pseudo second order kinetic model where the rate constant, k2, decreased as the sorbent size increased for all dyes. The adsorption isotherms followed both Langmuir and Freundlich models. Among three sorbent sizes, S size gave the highest adsorption capacity followed by M and L sizes. A reduction of sorbent size increased the specific surface area for mass transfer, and also increased the total pore volume, thus providing more active sites for adsorption. The adsorption of AB was adversely influenced by the protonation of algal surface at low pH. On the other hand, the adsorption of AR and AY could be due to weak electrostatic interaction, which was not significantly affected by pH. Increasing salinity of the system caused a decrease in adsorption capacity possibly due to the competition between Na^+ and the dye cations for the binding sites on algal surface. Moreover, an increase in salinity generated a compressed electrical double layer on the algal surface which exerted repulsive force, retarding the adsorption of positive charged molecules such as the basic dyes. 展开更多
关键词 textile dye ADSORPTION DECOLORIZATION Caulerpa lentillifera KINETICS isotherms salt concentration
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Isolation and characterization of Pseudomonas otitidis WL-13 and its capacity to decolorize triphenylmethane dyes 被引量:18
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作者 WU Jing JUNG Byung-Gil +2 位作者 KIM Kyoung-Sook LEE Young-Choon SUNG Nak-Chang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第7期960-964,共5页
Pseudomonas otitidis WL-13, which has a high capacity to decolorize triphenylmethane dyes, was isolated from activated sludge obtained from a wastewater treatment plant of a dyeing industry. This strain exhibited a re... Pseudomonas otitidis WL-13, which has a high capacity to decolorize triphenylmethane dyes, was isolated from activated sludge obtained from a wastewater treatment plant of a dyeing industry. This strain exhibited a remarkable color-removal capability when tested against several triphenylmethane dyes under both shaking and static conditions at high concentrations of dyes. More than 95% of Malachite Green and Brilliant Green was removed within 12 h at 500 μmol/L dye concentration under shaking conditions. Crystal Violet lost about 13% of its color under the same conditions tested. The rate of decolorization increased when the M9 medium was supplemented with yeast extract. The optimum pH and temperature for color removal were 7-9 and 35-40℃, respectively. The observed changes in the visible spectra and the inspection of bacterial growth indicated the color-removal by the adsorption of dye to the cells during incubation with strains. 展开更多
关键词 ADSORPTION DECOLORIZATION Pseudomonas otitidis WL-13 triphenylmethane dye
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Biodecolorization and partial mineralization of Reactive Black 5 by a strain of Rhodopseudomonas palustris 被引量:9
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作者 WANG, Xingzu CHENG, Xiang +1 位作者 SUN, Dezhi Qi, Hong 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第10期1218-1225,共8页
A strain of photosynthetic bacterium, Rhodopseudomonas palustris W1, isolated from a lab-scale anaerobic moving bed biofilm reactor (MBBR) treating textile e?uent was demonstrated to decolorize Reactive Black 5 (RB5) ... A strain of photosynthetic bacterium, Rhodopseudomonas palustris W1, isolated from a lab-scale anaerobic moving bed biofilm reactor (MBBR) treating textile e?uent was demonstrated to decolorize Reactive Black 5 (RB5) effciently under anaerobic condition. By a series of batch tests, the suitable conditions for RB5 decolorization were obtained, namely, pH < 10, light presence, glutamine or lactate as carbon source with concentration more than 500 mg/L when lactate is selected, NH4Cl as a nitrogen source wi... 展开更多
关键词 DECOLORIZATION MINERALIZATION Reactive Black 5 (RB5) photosynthetic bacterium metabolite analysis
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Production of laccase by Coriolus versicolor and its application in decolorization of dyestuffs: (Ⅱ) Decolorization of dyes by laccase containing fermentation broth with or without self-immobilized mycelia 被引量:7
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作者 LIN Jian ping LIAN Wei +1 位作者 XIA Li ming CEN Pei lin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2003年第1期5-8,共4页
The capability of decolorization for commercial dyes by Coriolus versicolor fermentation broth containing laccase with or without immobilized mycelium was evaluated. With cell free fermentation broth containing l... The capability of decolorization for commercial dyes by Coriolus versicolor fermentation broth containing laccase with or without immobilized mycelium was evaluated. With cell free fermentation broth containing laccase, high decolorization ratio was achieved for acid orange 7, but not for the other dyes concerned. The immobilized mycelium was proved to be more efficient than the cell free system. All the four dyestuffs studied were found being decolourized with certain extent by immobilized mycelium. The repeated batch decolorization was carried out with satisfactory results. The experimental data showed that the continuous decolorization of wastewater from a printing and dyeing industry was possible by using the self immobilized C. Versicolor. 展开更多
关键词 LACCASE textile dyes immobilized mycelium DECOLORIZATION Coriolus versicolor
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Quantitative structure-activity relationship study on the biodegradation of acid dyestuffs 被引量:9
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作者 LI Yin XI Dan-li 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第7期800-804,共5页
Quantitative structure-biodegradability relationships (QSBRs) were established to develop predictive models and mechanistic explanations for acid dyestuffs as well as biological activities. With a total of four desc... Quantitative structure-biodegradability relationships (QSBRs) were established to develop predictive models and mechanistic explanations for acid dyestuffs as well as biological activities. With a total of four descriptors, molecular weight (MW), energies of the highest occupied molecular orbital (EHOMO), the lowest unoccupied molecular orbital (ELUMO), and the excited state (EES), calculated using quantum chemical semi-empirical methodology, a series of models were analyzed between the dye biodegradability and each descriptor. Results showed that EHOMO and Mw were the dominant parameters controlling the biodegradability of acid dyes. A statistically robust QSBR model was developed for all studied dyes, with the combined application of EHOMO and Mw. The calculated biodegradations fitted well with the experimental data monitored in a facultative-aerobic process, indicative of the reliable prediction and mechanistic character of the developed model. 展开更多
关键词 quantitative structure-activity relationship (QSAR) acid dyestuff BIODEGRADABILITY DECOLORIZATION
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Fenton Reagent Generated in Electrolysis Cell and Its Usage in Degradation and Decolorization of Dyes 被引量:8
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作者 CHEN Zhen ZHENG Xi +4 位作者 CHEN Ri-yao LAN Rui-fang LIN Zhi-hong CHEN Yu-feng ZHANG Yi-kang 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2002年第1期34-37,共4页
The Electro-chemistry process to produce Fenton reagents has been described. The in situ oxidation of dyes, acid chrome and alizarin red(Fenton reagents) with electrogenerated hydroxyl radicals was investigated. The \... The Electro-chemistry process to produce Fenton reagents has been described. The in situ oxidation of dyes, acid chrome and alizarin red(Fenton reagents) with electrogenerated hydroxyl radicals was investigated. The \{ I-V \} cyclic voltammograms were measured. The redox peaks of the dyes were not observed in the treated dye solutions instead of a couple of O_2/H_2O_2 redox peaks. The IR results indicate that acid chrome dye was decomposed into naphthylamine and phenol aminophenol sulfonic acid. The degradation and the decolorization of the dyes were comfirmed by the visible spectrum and the chemical analysis. The COD_ cr removing rate was close to 80%. 展开更多
关键词 DYE Wastewater DEGRADATION DECOLORIZATION
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Efficient decolorization of dye-containing wastewater using mycelial pellets formed of marine-derived Aspergillus niger 被引量:6
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作者 Tao Lu Qilei Zhang Shanjing Yao 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第3期330-337,共8页
In order to improve the efficient decolorization of dye-containing water by biosorbent and understand the biosorption mechanism, the self-immobilization mycelial pellets were prepared using a marine-derived fungus Asp... In order to improve the efficient decolorization of dye-containing water by biosorbent and understand the biosorption mechanism, the self-immobilization mycelial pellets were prepared using a marine-derived fungus Aspergillus niger ZJUBE-1, and an azo dye, Congo red was chosen as a model dye to investigate batch decolorization efficiency by pellets. The pellets as biosorbent showed strong salt and acid tolerance in biosorption process. The results for dye adsorption showed that the biosorption process fitted well with models of pseudo-second-order kinetic and Langmuir isotherm, with a maximum adsorption capacity of 263.2 mg·g^(-1) mycelium. During 6 batches of continuous decolorization operation, the mycelial pellets could possess efficient decolorization abilities(>98.5%).The appearance of new peak in the UV–Vis spectral result indicated that the decolorization process may also contain biodegradation. The mechanism studies showed that efficient biosorption ability of pellets only relies on the active zone on the surface of the pellet, which can be enhanced by nutrition supplement or be shifted outward by a reculture process. 展开更多
关键词 Mycelial pellets Batch decolorization Nutrition supplement Re-culture Dye wastewater treatment Adsorption mechanism
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Decolorization on Indigo Dyeing Wastewater by Laccase from Coriolus versicolor 被引量:10
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作者 Enli Gao Weijia Zhong +2 位作者 Xiaolan Fu Fushan Chen Zhigang Ye 《Meteorological and Environmental Research》 CAS 2013年第1期53-56,共4页
[ Object] The study aimed to discuss the decolorization on indigo dyeing wastewater by laccase from Coriolus versicolor. [ Method ] Firstly, the effects of temperature, pH, indigo concentration, HBT concentration, lac... [ Object] The study aimed to discuss the decolorization on indigo dyeing wastewater by laccase from Coriolus versicolor. [ Method ] Firstly, the effects of temperature, pH, indigo concentration, HBT concentration, laccase dosage on the decolorization of indigo dyeing wastewater by laccase/HBT, and then the synergism of laccase and acid cellulase was analyzed. [Result] Using ABTS as the substrate, the kinetic parame- ters, K,, and Vmax, were 0.318 mmol/L and 0.035 5 mmol/( L . min) respectively. The decolorization rate of indigo reached 96.5% when the lacca- se acted on indigo for 40 min with HBT as an introducer at temperature 50 ℃, pH =4.5, indigo concentration 100 mg/L, HBT concentration 0.1% and laccase dosage 100 lU/L. Due to the synergism of laccase and acid cellulase during the bio-finishing of blue jeans, the backstaining degree of blue jeans reduced by 85% when the amount of laccase added was 15 000 IU/kg. Menawhile, the synergism of the laccase and acid cellulase de- creased indigo concentration in wastewater by 83.8%. [ Conclusion ] The laccase from Coriolus versicolor had a good prospect in the bio-finishing of blue jeans and the decolorization of indigo dyeing wastewater. 展开更多
关键词 LACCASE Coriolus versicolor INDIGO DECOLORIZATION Dyeing wastewater China
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Comparison of decolorization of reactive azo dyes by microorganisms isolated from various sources 被引量:6
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作者 S.Padamavathy S.Sandhya +2 位作者 K.Swaminathan Y.V.Subrahmanyam S.N.Kaul 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2003年第5期628-632,共5页
Azo dyes are among the oldest man made chemicals and they are still widely used in the textile, printing and the food industries. About 10%-15% of the total dyes used in the industry is released into the environment ... Azo dyes are among the oldest man made chemicals and they are still widely used in the textile, printing and the food industries. About 10%-15% of the total dyes used in the industry is released into the environment during the manufacturing and usage. Some dyes and some of their N substituted aromatic bio transformation products are toxic and/or carcinogenic and therefore these dyes are considered to be environmental pollutants and health hazards. These azo dyes are degraded by physico chemical and biological methods. Of these, biological methods are considered to be the most economical and efficient. In this work, attempts were made to degrade these dyes aerobically. The organisms which were efficient in degrading the following azo dyes Red RB, Remazol Red, Remazol Blue, Remazol Violet, Remazol Yellow, Golden Yellow, Remazol Orange, Remazol Black were isolated from three different sources viz., wastewater treatment plant, paper mill effluent treatment plant and tannery wastewater treatment plant. The efficiency of azo dye degradation by mixed cultures from each source was analyzed. It was found that mixed cultures from tannery treatment plant worked efficiently in decolorizing Remazol Red, Remazol Orange, Remazol Blue and Remazol Violet, while mixed cultures from the paper mill effluent worked efficiently in decolorizing Red RB, Golden Yellow and Remazol Yellow. The mixed cultures from wastewater treatment plant efficiently decolorized Remazol Black. 展开更多
关键词 azo dyes DECOLORIZATION aerobic transformation
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Effects of glucose on the decolorization of Reactive Black 5 by yeast isolates 被引量:6
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作者 YANG Qingxiang TAO Lingxia +1 位作者 YANG Min ZHANG Hao 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2008年第1期105-108,共4页
The cometabolic roles of glucose were investigated in decolorization of an azo dye, Reactive Black 5, by yeast isolates, Debaryomyces polymorphus and Candida tropicalis. The results indicated that the dye degradation ... The cometabolic roles of glucose were investigated in decolorization of an azo dye, Reactive Black 5, by yeast isolates, Debaryomyces polymorphus and Candida tropicalis. The results indicated that the dye degradation by the two yeasts was highly associated with the yeast growth process and glucose presence in the medium. Color removal of 200 mg dye/L was increased from 76.4% to 92.7% within 60 h to 100% within 18-24 h with the increase of glucose from 5 to 10 g/L, although the activity of manganese dependent peroxidase (MnP) decreased by 2-8 times in this case. Hydrogen peroxide of 233.3 μg/L was detected in 6 h in D. polymorphus culture. The cometabolic functions of glucose and hydrogen peroxide could be also confirmed by the further color removals of 95.8% or 78,9% in the second cycle of decolorization tests in which 7 g glucose/L or 250 μg H202/L was superadded respectively together with 200 mg dye/L. 展开更多
关键词 DECOLORIZATION YEAST manganese dependent peroxidase Azo dye Reactive Black 5
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小麦秸秆发酵产生的真菌Pleurotus ostreatus IBL-02锰过氧化物酶的溶胶-凝胶固定化及其催化污水脱色(英文) 被引量:4
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作者 Muhammad Asgher Bazgha Aslam +1 位作者 Hafiz Muhammad Nasir Iqbal 《催化学报》 SCIE EI CAS CSCD 北大核心 2013年第9期1756-1761,共6页
Solid state bio-processing of wheat straw was carried out through an indigenous fungal strain Pleurotus ostreatus IBL-02 under pre-optimized fermentation conditions. The maximum activity, 692±12 U/mL, of the indu... Solid state bio-processing of wheat straw was carried out through an indigenous fungal strain Pleurotus ostreatus IBL-02 under pre-optimized fermentation conditions. The maximum activity, 692±12 U/mL, of the industrially important manganese peroxidase (MnP) enzyme was recorded after five days of still culture incubation. The crude MnP was 2.1-fold purified with a specific activity of 860 U/mg after purification on a Sephadex-G-100 gel column. On native and SDS-PAGE electrophoresis gels, the purified MnP fraction was a single homogenous band of 45 kDa. An active fraction of MnP was immobilized using hydrophobic sol-gel entrapment comprising tetramethoxysilane (T) and propyltrimethoxysilane (P) at different T:P molar ratios. Characterization revealed that after 24 h incubation at varying pH and temperatures, the MnP fraction immobilized at a T:P ratio of 1:2 in the sol-gel retained 82% and 75% of its original activity at pH4 and 70 ℃, respectively. The optimally active fraction at a 1:2 T:P ratio was tested against MnSO4 as a substrate to determine the kinetic catalytic constants KM and Vmax . To explore the industrial applicability of P. ostreatus IBL-02 MnP, both the free and immobilized MnP were used for the decolorization of four different textile industrial effluents. A maximum of 100% decolorization was achieved for the different textile effluents within the shortest time period. A lower KM , higher Vmax , hyper-activation, and enhanced acidic and thermal resistance up to 70 ℃ were the novel catalytic features of the sol-gel immobilized MnP, suggesting that it may be a potential candidate for biotechnological applications particularly for textile bioremediation purposes. 展开更多
关键词 PLEUROTUS ostreatus IBL-02 Bio-catalysis Manganese PEROXIDASE Immobilization Sol-gel Textile effluent DECOLORIZATION
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Potential of plant polyphenol oxidases in the decolorization and removal of textile and non-textile dyes 被引量:4
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作者 AMJAD ALI Khan QAYYUM Husain 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2007年第4期396-402,共7页
In this study an effort has been made to use plant polyphenol oxidases; potato (Solanum tuberosum) and brinjal (Solanum melongena), for the treatment of various important dyes used in textile and other industries.... In this study an effort has been made to use plant polyphenol oxidases; potato (Solanum tuberosum) and brinjal (Solanum melongena), for the treatment of various important dyes used in textile and other industries. The ammonium sulphate fractionated enzyme preparations were used to treat a number of dyes under various experimental conditions. Majority of the treated dyes were maximally decolorized at pH 3.0. Some of the dyes were quickly decolorized whereas others were marginally decolorized. The initial first hour was sufficient for the maximum decolorization of dyes. The rate of decolorization was quite slow on long treatment of dyes. Enhancement in the dye decolorization was noticed on increasing the concentration of enzymes. The complex mixtures of dyes were treated with both preparations of polyphenol oxidases in the buffers of varying pH values. Potato polyphenol oxidase was significantly more effective in decolorizing the dyes to higher extent as compared to the enzyme obtained from brinjal polyphenol oxidase. Decolorization of dyes and their mixtures, followed by the formation of an insoluble precipitate, which could be easily removed simply by centrifugation. 展开更多
关键词 DECOLORIZATION textile dyes polyphenol oxidases POTATO BRINJAL wastewater treatment removal of dyes
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Treatment of Dye Wastewater by Using a Hybrid Gas/Liquid Pulsed Discharge Plasma Reactor 被引量:5
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作者 鲁娜 李杰 +1 位作者 吴彦 佐藤正之 《Plasma Science and Technology》 SCIE EI CAS CSCD 2012年第2期162-166,共5页
A hybrid gas/liquid pulsed discharge plasma reactor using a porous ceramic tube is proposed for dye wastewater treatment. High voltage pulsed discharge plasma was generated in the gas phase and simultaneously the plas... A hybrid gas/liquid pulsed discharge plasma reactor using a porous ceramic tube is proposed for dye wastewater treatment. High voltage pulsed discharge plasma was generated in the gas phase and simultaneously the plasma channel was permeated through the tiny holes of the ceramic tube into the water phase accompanied by gas bubbles. The porous ceramic tube not only separated the gas phase and liquid phase but also offered an effective plasma spreading channel. The effects of the peak pulse voltage, additive gas varieties, gas bubbling rate, solution conductivity and TiO2 addition were investigated. The results showed that this reactor was effective for dye wastewater treatment. The decoloration efficiency of Acid Orange II was enhanced with an increase in the power supplied. Under the studied conditions, 97% of Acid Orange II in aqueous solution was effectively decolored with additive oxygen gas, which was 51% higher than that with argon gas, and the increasing 02 bubbling rate also benefited the decoloration of dye wastewater. Water conductivity had a small effect on the level of decoloration. Catalysis of TiO2 could be induced by the pulsed discharge plasma and addition of TiO2 aided the decoloration of Acid Orange II. 展开更多
关键词 pulsed discharge plasma porous ceramic tube dye wastewater DECOLORATION
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