硫化亚铁活化过一硫酸盐降解含表面活性剂水溶液中三氯乙烯的效果与机制  

Degradation of trichloroethene in water solution containing surfactant by peroxymonosulfate activated by ferrous sulfide

作　　者：王岽[1] 王鹏 吕树光[2] 刘靖杰 WANG Dong;WANG Peng;LYU Shuguang;LIU Jingjie(SINOPEC Beijing Research Institute of Chemical Industry,Beijing 100013;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process,East China University of Science and Technology,Shanghai 200237)

机构地区：[1]中石化(北京)化工研究院有限公司,北京100013 [2]华东理工大学资源与环境工程学院,国家环境保护化工过程环境风险评价与控制重点实验室,上海200237

出　　处：《环境工程学报》2023年第2期431-441,共11页Chinese Journal of Environmental Engineering

基　　金：国家重点研发计划项目(2018YFC1803304);中国石油化工股份有限公司科技开发项目(321093)。

摘　　要：采用硫化亚铁(FeS)活化过一硫酸盐(PMS)降解含表面活性剂吐温-80(TW-80)水溶液中的三氯乙烯(TCE),考察了PMS和FeS投加量、TW-80浓度、溶液初始pH、无机阴离子(Cl–和HCO3–)对TCE降解的影响,确定了PMS/FeS体系中的主导自由基及TCE降解机理,验证了PMS/FeS体系处理实际地下水中含TW-80的TCE效果。结果表明:增加PMS或FeS投加量有利于TCE的降解,但当其投加剂量分别超过0.8 mmol·L^(-1)和0.6 g·L^(-1)时,TCE降解反而受到抑制,且TCE的降解率随TW-80浓度的增加而下降;PMS/FeS体系对pH有较宽的适用范围,在pH=11时受到抑制,Cl^(–)和HCO_(3)^(–)对TCE降解有抑制作用;通过自由基淬灭实验和电子顺磁共振实验确定了SO_(4)^(–)·、HO·和O_(2)^(–)·是PMS/FeS体系中的主导自由基;相比于其他氯代烃,该体系对四氯乙烯和四氯化碳也有较好的降解效果;实际地下水的处理结果证实PMS/FeS体系在实际应用中具有潜力和优势。Ferrous sulfide(FeS) was used to activate peroxymonosulfate(PMS) for trichloroethylene(TCE)degradation in solution containing Tween-80(TW-80). The effects of PMS and FeS doses, the initial solution pH, inorganic anions(Cl–and HCO3–) on TCE degradation were investigated. The main reactive radicals generated in PMS/FeS system were determined and TCE degradation mechanisms were revealed. The degradation performance of TCE in actual groundwater containing TW-80 was verified by PMS/FeS process.The experimental results showed that the increase of PMS or FeS dosage was favorable to TCE removal, while TCE degradation was inhibited at PMS dose over 0.8 mmol·L^(-1)or FeS dose over 0.6 g·L^(-1). In addition, TCE degradation rate decreased with the increase of TW-80 concentration. PMS/FeS system performed well in a wide pH range, but its effect was seriously inhibited at pH = 11. Both Cl–and HCO3–had inhibitive effects on TCE removal. SO_(4)^(–)·, HO· and O_(2)^(–)· were identified as the main reactive radicals in PMS/FeS system by radical scavenging tests and electron paramagnetic resonance detection. Compared with other chlorinated hydrocarbons,PMS/FeS had a better performance on perchloroethylene and carbon tetrachloride degradation. Finally, the test results using actual groundwater demonstrated that PMS/FeS system had a great application potential in actual groundwater remediation.

关 键 词：三氯乙烯 表面活性剂 过一硫酸盐 硫化亚铁 地下水修复 

分 类 号：X523[环境科学与工程—环境工程]