有机蒙脱石负载纳米零价铁活化过硫酸盐降解土壤中四溴双酚A  

Degradation of tetrabromobisphenol A with persulfate activated by nanoscale zero-valent iron supported on organo-montmorillonite in soil

作　　者：丛鑫 赵彬荣 俞顺涛 薛南冬 孙美桢[1,2] 王也 杜思盈 CONG Xin;ZHAO Binrong;YU Shuntao;XUE Nandong;SUN Meizhen;WANG Ye;DU Siying(College of Environmental Science and Engineering,Liaoning Technical University,Fuxin 123000;Technical Center for Soil,Agricultural and Rural Ecology and Environment,Ministry of Ecology and Environment of the People’s Republic China,Beijing 100012;Chinese Research Academy of Environmental Sciences,Beijing 100012)

机构地区：[1]辽宁工程技术大学环境科学与工程学院,阜新123000 [2]生态环境部土壤与农业农村生态环境监管技术中心,北京100012 [3]中国环境科学研究院,北京100012

出　　处：《环境科学学报》2024年第7期462-472,共11页Acta Scientiae Circumstantiae

基　　金：国家重点研发计划(No.2017YFD0800700,2016YFD0800202)。

摘　　要：土壤中四溴双酚A(TBBPA)污染对人体健康和生态环境构成潜在威胁.利用有机蒙脱石(OMt)和纳米零价铁(n ZVI)制备有机蒙脱石负载纳米零价铁(n ZVI@OMt)材料,探究其活化过硫酸盐(PS)对土壤中TBBPA的降解机理.结果表明:在3 g·kg^(-1)n ZVI@OMt、30 mmol·L^(-1)PS、初始p H 5.5和35℃条件下,n ZVI@OMt活化PS体系中TBBPA降解率达到91.18%,且符合伪一级动力学模型.n ZVI@OMt投加量的增加、PS浓度的提高和温度的升高均对TBBPA的降解有促进作用,而初始p H的升高则会抑制其降解.n ZVI@OMt活化PS降解土壤TBBPA的过程中SO_(4)·^(-)和·OH均参与反应.通过异丙基和苯环的断裂及分步脱溴反应实现TBBPA降解.研究表明n ZVI@OMt活化PS体系能有效治理TBBPA污染土壤,为有机物污染土壤修复提供技术支撑.The tetrabromobisphenol A (TBBPA) in soil posed a potential threat to human health and ecological environment.In this study,TBBPA degradation was investigated using nanoscale zero-valent iron(n ZVI) supported on an organo-montmorillonite (OMt) composite (n ZVI/OMt) to activate persulfate (PS).Results demonstrated that n ZVI@OMt can effectively activate PS to degrade TBBPA in soil.Up to 91.18%degradation of TBBPA was achieved within 12 hours under the reaction conditions:3 g·kg^(-1) n ZVI@OMt,30 mmol·L^(-1) PS and p H 5.5 at 35℃,following pseudo-first-order reaction kinetics model.Notably,degradation efficiency of TBBPA was enhanced by the increasing dosage of n ZVI@OMt and concentration of PS as well as the rising temperature,but inhibited by higher initial p H.Both SO_(4)·~-and·OH participated in the TBBPA degradation reaction.The degradation is achieved by the cleavage of isopropyl and benzene rings,coupled with step-by-step debromination.The findings presented the efficacy of n ZVI@OMtactivated PS in treating TBBPA-polluted soil,providing valuable technical supports for soil remediation in cases of organic matter pollution.

关 键 词：四溴双酚A 纳米零价铁 蒙脱石 过硫酸盐 土壤 

分 类 号：X53[环境科学与工程—环境工程]