US/nZVI/H_2O_2系统协同降解对羟基苯甲酸乙酯
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摘要
以对羟基苯甲酸乙酯(EP)为目标污染物,考察了US/nZVI/H_2O_2系统中有机物污染物的降解特性。以US(超声波)、H_2O_2、nZVI(纳米零价铁)分别或联合对EP进行试验,使用控制变量法,检测不同操作参数和不同的H_2O_2、nZVI的量对EP降解的影响。结果表明,US/nZVI/H_2O_2联合系统对EP的降解存在协同作用,说明在US/nZVI/H_2O_2体系中,同时存在超声波的空化作用和nZVI的还原作用,nZVI和H_2O_2的存在大大提高了体系中羟基自由基的生成效率。
Ethyl p-hydroxybenzoate(EP) was used as the target contaminant, and its degradation was analyzed by US/nZVI/H_2O_2 system. The effect of different operating parameters and different amounts of H_2O_2, nZVI on the degradation of EP was examined by a control variable method. US(ultrasonic), H_2O_2, and nZVI(nano-zero-valent iron) were tested on EP alone and in combination. The results showed that the US/nZVI/H_2O_2 combined system had a synergistic effect on the degradation of EP, indicated that in the US/nZVI/H_2O_2 system, there were ultrasonic cavitation and nZVI reduction simultaneously. The presence of nZVI and H_2O_2 greatly increased the efficiency of hydroxyl radical generation in this system. The possible degradation pathways of EP were analyzed on the basis of data comparisons and previous reports.
Ethyl p-hydroxybenzoate(EP) was used as the target contaminant, and its degradation was analyzed by US/nZVI/H_2O_2 system. The effect of different operating parameters and different amounts of H_2O_2, nZVI on the degradation of EP was examined by a control variable method. US(ultrasonic), H_2O_2, and nZVI(nano-zero-valent iron) were tested on EP alone and in combination. The results showed that the US/nZVI/H_2O_2 combined system had a synergistic effect on the degradation of EP, indicated that in the US/nZVI/H_2O_2 system, there were ultrasonic cavitation and nZVI reduction simultaneously. The presence of nZVI and H_2O_2 greatly increased the efficiency of hydroxyl radical generation in this system. The possible degradation pathways of EP were analyzed on the basis of data comparisons and previous reports.
引文
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[2]BLEDZKA D,GROMADZNSKA J,WASOWICZ W.Parabens.From environmental studies to human health[J].Environment International,2014,67:27-42.
[3]PHLILIPPA D D.Human Health Implications of Personal Care Products:Breast Cancer and Other Breast-Related Diseases[M].Reference Module in Earth Systems and Environmental Sciences,2018.
[4]STETER J R,ROCHA R S,DIONISIO D,et al.Electrochemical oxidation route of methyl paraben on a boron-doped diamond anode[J].Electrochimica Acta,2014,117(4):127-133.
[5]YU Y Y,HUANG Q X,WANG Z F,et al.Occurrence and behavior of pharmaceuticals,steroid hormones,and endocrine-disrupting personal care products in wastewater and the recipient river water of the Pearl River Delta,South China[J].Journal of Environmental Monitoring,2011,13(4):871-878.
[6]ALBERO B,PEREZ C,SANCHEZ-BRUNETE C,et al.Occurrence and analysis of parabens in municipal sewage sludge from wastewater treatment plants in Madrid(Spain)[J].Journal of Hazardous Materials,2012,239-240:48-55.
[7]BARZEGAR G,JORFI S,ZAREZADEH V,et al.4-Chlorophenol degradation using ultrasound/peroxymonosulfate/nanoscale zero valent iron:Reusability,identification of degradation intermediates and potential application for real wastewater[J].Chemosphere,2018,201:370-379.
[8]JIANG J,PANG S Y,MA J.Factors affecting the yield of oxidants from the reaction of nanoparticulate zero-valent iron and oxygen[J].Environmental Science&Technology,2008,42(14):5377-5378.
[9]XU L J,WANG J L.A heterogeneous Fenton-like system with nanoparticulate zero-valent iron for removal of 4-chloro-3-methyl phenol[J].Journal of Hazardous Materials,2011,186(1):256-264.
[10]LUO X Z,YANG X M,WANG D,et al.Degradation of diclofenac by ultrasonic irradiation:Kinetic studies and degradation pathways[J].Chemosphere,2014,113:165-170.
[11]WANG X K,YAO Z Y,WANG J G,et al.Degradation of reactive brilliant red in aqueous solution by ultrasonic cavitation[J].Ultrasonics Sonochemistry,2008,15(1):43-48.
[12]LIAO X J,RAGHAVAN G S V,YAYLAYAN V A.A novel way to prepare n-butylparaben under microwave irradiation[J].Tetrahedron Letters,2002,43(1):45-48.
[13]刘侃侃，罗才武.超声波/零价铁协同降解2,4-二氯苯酚和五氯苯酚的研究[J].净水技术，2010(1):30-33.
[14]GRAHAN N.A systematic study of the degradation of dimethyl phthalate using a high-frequency ultrasonic process[J].Ultrasonics Sonochemistry,2013,20(3):892-899.
[15]史雅慧.抗生素废水的超声空化效应降解的研究[D].济南：济南大学，2010.
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