钒氧化物活化过硫酸钠降解2,4,6-三氯酚的机制  

Mechanism of persulfate activation with vanadium oxides for 2,4,6-TCP degradation

作　　者：吴文慧[1,2] 邓亚梅[2] 施维林[1] 方国东[2] 周东美[2] 

机构地区：[1]苏州科技大学环境科学与工程学院,苏州215009 [2]中国科学院土壤环境与污染修复重点实验室,南京土壤研究所,南京210008

出　　处：《环境工程学报》2017年第5期3244-3250,共7页Chinese Journal of Environmental Engineering

基　　金：苏州科技学院校研究生创新项目(SKCX15_034);江苏省自然科学基金资助项目(BK20141047);江苏省环保科技课题(2015011);国家自然科学基金资助项目(31570515);江苏高校水处理技术与材料协同创新项目;苏州市科技支撑计划项目(SS201421,SS201523);苏州市环保科技项目(2015-3)

摘　　要：研究了三氧化二钒(V_2O_3)活化过硫酸钠(SPS)降解2,4,6-三氯酚(TCP)的效果,分别考察了V_2O_3投加量、SPS和TCP浓度对其降解的影响。结果表明,在V_2O_3投加量为0.05 g·L^(-1),SPS浓度为1.0 mmol·L^(-1),TCP初始浓度为5.0mg·L^(-1)时,反应24 h,有72.4%的TCP被降解。提高V_2O_3投加量不利于TCP的降解,而增加SPS浓度能有效增加TCP的降解速率;利用自由基淬灭反应和电子顺磁共振技术(EPR)对反应体系的主导自由基进行了鉴定,发现羟基是体系降解TCP的主要活性物种,推测并初步证实了V_2O_3活化SPS的过程,发现了二氧化钒(VO_2)和五氧化二钒(V_2O_5)也能活化SPS降解TCP。In the present study,activation of persulfate with V_2O_3 for 2,4,6-TCP degradation was investigated,and the effects of V_2O_3 loading,SPS concentration on 2,4,6-TCP degradation was also studied.The experimental results showed that 72.4% of 5.0 mg·L^（-1）2,4,6-TCP was degraded with 1.0 mmol·L^（-1）SPS in the presence of 0.05 g·L^（-1）V_2O_3 within 24 h,which indicated that SPS can be efficiently activated with V_2O_3 for 2,4,6-TCP degradation.Increasing V_2O_3 loading inhibited 2,4,6-TCP degradation,while increasing SPS concentration enhanced its degradation.Electron paramagnetic resonance technique coupled with free radical quenching studies were used to identify the dominant reactive species for 2,4,6-TCP degradation in the V_2O_3/SPS system.The results indicated that hydroxyl radical was the dominant reactive species for 2,4,6-TCP degradation.The likely process for SPS activation was proposed,and was supported the fact that SPS can be activated with VO_2 and V_2O_5 for 2,4,6-TCP degradation.

关 键 词：钒氧化物 活化 过硫酸盐 降解 2 4 6-TCP 

分 类 号：X53[环境科学与工程—环境工程]