碱催化过氧化氢氧化法对偶氮染料酸橙7的降解性能
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摘要
针对过氧化氢溶液在碱性条件下降解有机污染物的反应,选择偶氮染料酸橙7(AO7)作为目标污染物,研究各种反应参数对AO7降解的影响;同时,利用抗坏血酸、叔丁醇、糠醇、氯化硝基四氮唑蓝4种不同自由基猝灭剂鉴定染料在降解过程中的主要活性物质.实验结果表明:碱催化过氧化氢的高级氧化体系可有效地降解水中典型偶氮染料AO7,最适pH值为11,且随着过氧化氢浓度的增加和反应温度的上升,AO7的降解速率随之显著升高;超氧自由基是降解AO7的主要活性物质.
Aiming at the reaction of degrading organic pollutants by alkali-catalyzed hydrogen peroxide(H_2O_2),the influence of various parameters on AO7degradation by alkali-activated H_2O_2 was evaluated by choosing azo dye of acid orange 7(AO7)as the target organic pollutant.Furthermore,radical scavengers,including ascorbic acid,t-butanol,furfuryl alcohol and nitro blue tetrazolium,were tested to identify the active species involved in the dye degradation.Experimental results show that the process of alkali-catalyzed H_2O_2is effective for degrading the typical azo dye of AO7in aqueous solution.The optimum pH value for degrading AO7is 11.Moreover,the degradation of AO7is accelerated significantly with the increasing of H_2O_2concentration and reaction temperature.The major reactive oxidant for degrading AO7by alkali-catalyzed H_2O_2is confirmed as O_2~(·-).
Aiming at the reaction of degrading organic pollutants by alkali-catalyzed hydrogen peroxide(H_2O_2),the influence of various parameters on AO7degradation by alkali-activated H_2O_2 was evaluated by choosing azo dye of acid orange 7(AO7)as the target organic pollutant.Furthermore,radical scavengers,including ascorbic acid,t-butanol,furfuryl alcohol and nitro blue tetrazolium,were tested to identify the active species involved in the dye degradation.Experimental results show that the process of alkali-catalyzed H_2O_2is effective for degrading the typical azo dye of AO7in aqueous solution.The optimum pH value for degrading AO7is 11.Moreover,the degradation of AO7is accelerated significantly with the increasing of H_2O_2concentration and reaction temperature.The major reactive oxidant for degrading AO7by alkali-catalyzed H_2O_2is confirmed as O_2~(·-).
引文
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[2]LONG Xizi,PAN Qinrong,WANG Chuqiao,et al.Microbial fuel cell-photoelectrocatalytic cell combined system for the removal of azo dye wastewater[J].Bioresource Technology,2017,244:182-191.DOI:10.1016/j.biortech.2017.07.088.
[3]TEH C Y,BUDIMAN P M,SHAK K P Y,et al.Recent advancement of coagulation-flocculation and its application in wastewater treatment[J].Industrial and Engineering Chemistry Research,2016,55(16):4363-4389.DOI:10.1021/acs.iecr.5b04703.
[4]FALAS P,WICK A,CASTRONOVO S,et al.Tracing the limits of organic micropollutant removal in biological wastewater treatment[J].Water Research,2016,95:240-249.DOI:10.1016/j.watres.2016.03.009.
[5]BARRERADIAZ C,LINARESHEMANDEZ I,ROAMORALES G,et al.Removal of biorefractory compounds in industrial wastewater by chemical and electrochemical pretreatments[J].Industrial and Engineering Chemistry Research,2009,48(3):1253-1258.DOI:10.1021/ie800560n.
[6]PIGNATELLO J J,OLIVEROS E,MACKAY A.Advanced oxidation processes for organic contaminant destruction based on the Fenton reaction and related chemistry[J].Critical Reviews in Environmental Science and Technology,2006,36(1):1-84.DOI:10.1080/10643380500326564.
[7]王炳煌,张倩,汤须崇,等.废铁屑活化过硫酸盐降解偶氮染料RB5废水[J].华侨大学学报(自然科学版),2017,38(5):653-658.DOI:10.11830/ISSN.1000-5013.201607002.
[8]张圆春,汤须崇,薛秀玲,等.低成本铁碳复合非均相Fenton催化剂制备及其性能[J].华侨大学学报(自然科学版)2017,38(4):515-520.DOI:10.11830/ISSN.1000-5013.201704013.
[9]BOKARE A D,CHOI W.Review of iron-free Fenton-like systems for activating H2O2in advanced oxidation processes[J].Journal of Hazardous Materials,2014,275(2):121-135.DOI:10.1016/j.jhazmat.2014.04.054.
[10]LTAIEF A H,SABATINO S,PROIETO F,et al.Electrochemical treatment of aqueous solutions of organic pollutants by electro-Fenton with natural heterogeneous catalysts under pressure using Ti/IrO2-Ta2O5 or BDD anodes[J].Chemosphere,2018,202:111-118.DOI:10.1016/j.chemosphere.2018.03.061.
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[12]KATAIFAS A,LIPINSKA M,STRUTYNSKI K.Alkaline hydrogen peroxide as a degradation agent of methylene blue-kinetic and mechanistic studies[J].Reaction Kinetics,Mechanisms and Catalysis,2010,101(2):251-266.DOI:10.1007/s11144-010-0234-7.
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[14]CHRISTENSEN H,SEHESTED K,CORFITZEN H.Reaction of hydroxyl radical with hydrogen peroxide at ambient and elevated temperatures[J].Journal of Physical Chemistry,1982,86(9):1588-1590.DOI:10.1021/j100206a023.
[15]QIANG Zhimin,CHANG J H,HUANG C P.Electrochemical generation of hydrogen peroxide from dissolved oxygen in acidic solutions[J].Water Research,2002,36(1):85-94.DOI:10.1016/S0043-1354(01)00235-4.
[16]BUXTON G V,GREENSTOCK C L,HELMAN W P,et al.Critical review of rate constants for reactions of hydrated electrons,hydrogen atoms and hydroxyl radicals in aqueous solution[J].Journal of Physical and Chemical Reference Data,1988,17(2):513-886.DOI:10.1063/1.555805.
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