过渡金属离子活化过硫酸盐去除土壤中的芘  

Removal of pyrene in contaminated soil by transition metal ions activated persulfate

作　　者：张宏玲[1] 李森[1] 张杨[1] 罗勇[1] 商照聪[1] 吴向阳[1] 

机构地区：[1]上海化工研究院,上海200062

出　　处：《环境工程学报》2016年第10期6009-6014,共6页Chinese Journal of Environmental Engineering

基　　金：2014上海市科委土壤专项(14231200502)

摘　　要：比较研究了Fe^(2+)、Co^(2+)和Ag^+活化Na_2S_2O_8及KHSO_5对土壤中芘的氧化降解效果,并对上述反应过程进行动力学研究及芘降解产物成分分析。在土水质量比为1∶5,氧化剂和过渡金属离子添加摩尔比为10∶1,30℃恒温水浴磁力搅拌及反应时间5~120 min条件下开展了系列实验。结果表明,3种离子中Fe^(2+)活化Na_2S_2O_8氧化降解芘的去除效果最优,反应120 min后芘去除率为93.4%;Co^(2+)是活化KHSO_5的最佳过渡金属离子,反应5 min后芘去除率达94.5%,在反应120 min后芘去除率增高至97.0%。此外,降解动力学拟合结果表明Fe^(2+)、Co^(2+)和Ag^+活化Na_2S_2O_8和KHSO_5降解芘的过程符合准一级反应动力学,且土壤中绝大部分芘可被活化过硫酸盐体系氧化降解。The degradation efficiency of pyrene in soil by Fe2＋-,Co2＋-,and Ag＋-activated Na2S2O8 and KHSO5was investigated comparatively,and the kinetics of the reaction process and by-products of pyrene were analyzed. The experiments were carried out with a soil-to-water weight ratio of 1 ∶ 5,oxidant-to-transition-metal-ion molar ratio of 10 ∶ 1,constant water bath temperature of 30 ℃ with magnetic stirring,and reaction time of 5 to 120 min. The results showed that Na2S2O8 activated by Fe2＋performed better in the removal of pyrene than the other two types of metal ions,and the obtained maximum removal yield of pyrene was 93. 4% in the case of a reaction time of 120 min. In contrast,Co2＋was revealed to be the best transition metal ion for activating KHSO5 among the three types of metal ions,displaying a pyrene removal yield of 94. 5% with a reaction time of 5 min,which increased to 97. 0% at 120 min. Furthermore,the fitting results of degradation kinetics demonstrated that the pyrene degradation process by Fe2＋-,Co2＋-,and Ag＋-activated Na2S2O8 and KHSO5follows pseudo-first-order reaction kinetics,and the pyrene in soil was almost completely degraded by the activated persulfate system.

关 键 词：过硫酸钠 过硫酸氢钾 过渡金属离子 芘污染土壤 芘 

分 类 号：X53[环境科学与工程—环境工程]