| 降解偶氮染料AO7的研究：动力学及反应途径 |
| 摘要点击 6292 全文点击 2444 投稿时间：2009-09-13 修订日期：2009-12-28 |
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| 中文关键词 高级氧化技术(AOTs) 硫酸自由基 紫外光解 降解途径 废水处理 |
| 英文关键词 advanced oxidation technologies (AOTs) sulfate radical UV photolysis degradation pathway wastewater treatment |
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| 中文摘要 |
| 紫外光分解过硫酸盐（S2O2-8）是一种新型的高级氧化技术，可以产生强氧化性的硫酸根自由基（SO·-4）.以偶氮染料AO7为目标污染物，重点研究了反应体系氧化剂K2S2O8浓度、溶液初始pH值和无机阴离子（H2PO-4、HCO-3、NO-3和Cl-）对反应体系的影响.结果表明，AO7的降解遵循准一级动力学，当AO7初始浓度为0.14 mmol/L时，最佳的氧化剂K2S2O8与污染物AO7的摩尔比为20.pH值对UV/K2S2O8体系降解AO7的反应速率影响较大，增大pH有利于SO·-4转化为·OH.溶液中的无机离子对反应体系有一定的抑制作用.采用GC/MS分析了UV/K2S2O8体系降解AO7的主要中间产物（萘酚、1,2-苯并吡喃酮、邻苯二甲酸），并根据中间产物的分析推测了降解途径. |
| 英文摘要 |
| The UV photolysis of S2O2-8 is a novel advanced oxidation technologies (AOTs), which leads to the formation of strong oxidizing radicals, sulfate radicals (SO·-4）. The effect of oxidant K2S2O8concentration, the initial pH of solution and various inorganic anions (H2PO-4, HCO-3, NO-3 and Cl-) were investigated using AO7, a kind of azo dye, as a model pollutant. The degradation kinetics of AO7 followed pseudo first-order kinetics and reaction rates related to PMS concentrations. When the initial concentration of AO7 was 0.14 mmol/L, the optimal molar ratio of oxidant K2S2O8 to pollutants AO7 was 20. The effect of initial pH had great effect on the AO7 degradation rate during UV/ K2S2O8 system. Increasing system pH results in the formation of ·OH from SO·-4. The effects of four inorganic anions (H2PO-4, HCO-3, NO-3 and Cl-) all had some negative effect on the degradation of AO7. Based on the results of GC/MS, three main intermediates (2-naphthalenol, coumarin and 1,2-benzenedicarboxylic acid) were identified, thus the degradation pathway for SO·-4 induced by UV/K2S2O8 was proposed accordingly. |
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