Treatment of Organic Pollutants in Aqueous Solution by Homogenous and Heterogeneous Advanced Oxidation Processes
Online published: 2005-01-15
Supported by
supported by State Laboratory Innovation Base Foundation (001108) , Pilot Project of Knowledge Innovation Program of Chinese Academy of Sciences (KZCX2SW2121) , Chinese Academy of Sciences Project (KZCX22409
以UV/H2O2 均相高级氧化技术及TiO2 光电催化非均相氧化技术为例，选择硝基苯、4 硝基苯酚、喹啉和活性艳橙K R等为目标化合物，对高级氧化技术处理水中有机污染物进行了研究。研究表明，UV/H2O2体系中产生的·OH是硝基苯、4 硝基苯酚和喹啉降解的直接原因，有机物的降解可用准一级动力学进行很好的描述。系统研究了溶液pH值、氧化剂浓度及水体中存在的常见无机阴离子如HCO3- 、NO3- 、Cl-等对有机物降解的影响，探讨了各有机物的降解途径。建立了一种新的三维光电填充床催化反应器，结果表明，三维电极的使用，可以显著提高有机物的光催化氧化效率。外加电压和溶液中NaCl对活性艳橙K R和喹啉的氧化起着促进作用，同时还研究了溶液酸度条件、空气流速及氧气对光电催化的影响。
张文兵 , 傅家谟 , 肖贤明 , 盛国英 . 均相和非均相高级氧化技术处理水中有机污染物的研究[J]. 中国科学院大学学报, 2005 , 22(1) : 122 -127 . DOI: 10.7523/j.issn.2095-6134.2005.1.019
Nitrobenzene , 42nitrophenol , quinoline and reactive brilliant orange K-R were chosen as the model compounds to study the degradation of organic pollutants by homogeneous advanced oxidation process , UV/H2O2, and heterogeneous advanced oxidation process , photoelectrocatalytic oxidation. It was found that hydroxyl radical generated by the decomposition of hydrogen peroxide under the UV irradiation was the direct reason that caused organic pollutants to degrade. The degradation of organic pollutants by UVPH-O2 process accorded well with the pseudo-first order kinetics. The effects of pH values , oxidant concentration and anion ions such as HCO- 3, NO- 3 and Cl - have been studied systematically. The degradation pathways of organic pollutants by UV/H2O2 were discussed. A newly- designed continuous flow three-dimensional electrode-packed bed photocatalytic reactor was built up to investigate the photoelectrocatalytic degradation performance of organic pollutants. The results showed that application of the three-dimensional electrode could improve the removal efficiencies of photocatalytic process significantly. The applied cell voltage and the presence of NaCl would increase the removal efficiency of organic pollutants dramatically. And the effects of pH values , airflow and oxygen on the photoelectrocatalytic degradation of organic pollutants were also studied.
[1] Hoffmann MR , Martin ST, Won YC. Environmental application of semiconductor photocatalysis. Chem. Rev. , 1995 , 95 : 69～96
[2] Zhang WB , Xiao XM, Fu JM, et al . Use of H2O2 advanced oxidation processes for removal of organic pollutants in water. China Water andWastewater , 2002 , 18 (3) : 89～92 (in Chinese with English abstract)
[3] Pontius FW. Complying with the new drinking water quality regulations. J . Am. Water Works Assoc , 1990 , 82 : 2～52
[4] De Laat J , Dore M. Degradation of chloroethanes in dilute aqueous solution by H2O2PUV. Wat . Res . ,1994 , 28 : 2507～2519
[5] Adams CD , Kazhikannil JJ . Effects of UVPH2O2 preoxidation on the aerobic biodegradability of quaternary amine surfactants. Wat . Res . , 2000 ,34 : 668～672
[6] Candal RJ , Zeltner WA , Anderson MA. Effect of pH and applied potential on photocurrent and oxidtion rate of saline solutions of formic acid in aphotoelectrocatalytic reactor. Environ. Sci . Technol . , 2000 , 34 : 3443～3451
[7] An TC , Zhang WB , Zhu XH , et al . A novel photoelectrocatalytic reactor and photoelectrocatalytic advanced oxidation of formic acid. ChineseJournal of Catalysis , 2003 , 24 : 338～342 (in Chinese with English abstract)
[8] Li XZ, Li FB , Fan CM, et al . Photoelectrocatalytic degradation of humic acid in aqueous solution using a TiPTiO2 mesh photoelectrode in aqueoussolution. Wat . Res . , 2002 , 36 :2215～2224
[9] Zhang WB , An TC , Xiao XM, et al . Photochemical degradation performance of quinoline aqueous solution in the presence of hydrogen peroxide.J . Environ. Sci . Heal A , 2003 , 38 : 2599～2611
[10] Zhang WB , Xiao XM, An TC , et al . Kinetics , degradation pathway and reaction mechanism of advanced oxidation of 42nitrophenol in water byUVPH2O2 process. J . Chem. Technol . Biotechnol . , 2003 , 78 : 788～794
[11] Liao CH , Kang SF , Wu FA. Hydroxyl radical scavenging role of chloride and bicarbonate ions in the H2O2PUV process. Chemosphere , 2001 , 44 :1193～1200
[12] Zhang WB , Xiao XM, Fu JM, et al . Degradation of nitrophenol in water by UVPH2O2 process and influencing factors. Research of EnvironmentalSciences , 2001 , 14 : 10～11 ,15 (in Chinese with English abstract)
[13] Zhang WB , Xiao XM, Fu JM, et al . Effect of anions in aqueous solution on the degradation of 42nitrophenol by UVPH2O2 process. ChinaEnvironmental Science , 2002 , 22 : 301～304 (in Chinese with English abstract)
[14] Martin S , Fritz HF. Photochemical degradation of hydrophilic xenobiotics in the UVPH2O2 process : Influence of nitrate on the degradation rate ofEDTA , 22amino212naphthalene2sulfonate , diphenyl242sulfonate and 4 ,4p2diaminostilbene22 , 2p2disulfonate. Wat . Res . , 1997 , 31 : 2885～2891
[15] Nadtochenko V , Kiwi J . Primary photochemical reactions in the photo2Fenton system with ferric chloride. 1. A case study of xylidine oxidation asa model compound. Environ. Sci . Technol . , 1998 , 32 : 3273～3281
[16] Zhang WB , An TC , Xiao XM, et al . Photoelectrocatalytic degradation of reactive brilliant orange K2R in a new continuous flowphotoelectrocatalytic reactor. Appl . Catal . A , 2003 , 255 : 221～229
[17] An TC , Zhang WB , Xiao XM, et al . Photoelectrocatalytic degradation of quinoline with a novel three2dimensional electrode2packed bedphotocatalytic reactor. J . Photochem. Photobio. A , 2004 , 61 : 233～242
[18] An TC , Xiong Y, Li GY, et al . Synergetic effect in degradation of formic acid using a new photoelectrochemical reactor. J . Photochem.Photobiol . A , 2002 , 152 : 155～165
附中文参考文献
[2] 张文兵,肖贤明,傅家谟,等. 过氧化氢高级氧化技术去除水中有机污染物. 中国给水排水, 2002 , 18 (3) :89～92
[7] 安太成,张文兵,朱锡海,等. 一种新型光电催化反应器的研制及其对甲酸的光电深度氧化, 催化学报, 2003 , 24 : 338～342
[12] 张文兵,肖贤明,傅家谟,等. UVPH2O2 降解水中硝基酚及影响因素. 环境科学研究, 2001 , 14 : 10～11 ,15
[13] 张文兵,肖贤明,傅家谟,等. 溶液中阴离子对UVPH2O2 降解42硝基酚的影响. 中国环境科学, 2002 , 22 : 301～304
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