丙酮/氯离子协同活化过一硫酸盐降解酸性橙  

Acetone and chloride ion Synergistically activate peroxymonosulfate to decolorize acid orange

作　　者：张珂 许芬 陈家斌[1] 万玲 黄天寅[1] ZHANG Ke;XU Fen;CHEN Jia-bin;WAN Ling;HUANG Tian-yin(School of Enviromental Science and Engineering,Suzhou University of Science and Technology,Suzhou 215009,China)

机构地区：[1]苏州科技大学环境科学与工程学院,江苏苏州215009

出　　处：《中国环境科学》2018年第11期4159-4165,共7页China Environmental Science

基　　金：国家自然科学基金资助项目(51478283);江苏省研究生实践创新计划项目(SJCX17_0677)

摘　　要：采用丙酮/氯离子(Cl^-)协同活化过一硫酸盐(PMS)降解偶氮染料酸性橙7(AO7).研究发现,与Cl^-/PMS体系相比,丙酮/Cl^-/PMS体系降解AO7的效果显著增强,相应的AO7表观速率常数从0.0767增加到0.1725min^(-1).考察了丙酮/Cl^-/PMS体系降解AO7的主要影响因素(初始pH值、Cl^-浓度、PMS浓度、丙酮浓度).结果表明,在碱性环境下,随着Cl^-、PMS和丙酮浓度的增加,AO7的降解效果有所增强;研究丙酮/Cl^-/PMS体系降解AO7的降解机制.自由基猝灭实验表明,丙酮/Cl^-/PMS体系中没有自由基(硫酸根自由基(SO_4^-·)和羟基自由基(HO·))的产生,而次氯酸根(ClO^-)浓度在反应过程中逐渐增加,得出丙酮作为催化剂促进Cl^-和PMS产生更多HClO的结论.通过紫外可见光谱分析,表明AO7分子中偶氮键及萘环结构均被破坏.Acetone and chloride ion(Cl-)were used to synergistically activate peroxymonosulfate(PMS)to decolorize the azo dye,acid orange 7(AO7).It was found that the first-order rate constant increased from 0.0767 to 0.1725min-1 when acetone was added in Cl-/PMS systemIn the acetone/Cl-/PMS system,effect of various factors were explored,including initial pH,Cl-concentration,PMS and acetone dosage.The results indicated that the degradation of AO7 increased with the increase of Cl-、PMS、acetone concentration under alkaline conditions.The degradation mechanism of AO7 in acetone/Cl-/PMS system showed that neither sulfate radical(SO-4?)nor hydroxyl(HO?)was produced therein.Instead,the HOCl concentration was proved to be increased during the reaction.Hence,acetone could promote the reaction between PMS and Cl-to generate more HOCl.From the analysis of UV-vis spectra,the azo bond and naphthalene ring in AO7 was found being destructed.

关 键 词：氯离子 过一硫酸盐 丙酮 酸性橙7 次氯酸 

分 类 号：X703.1[环境科学与工程—环境工程]