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

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.

Progress in study on endocrine disrupting pesticides (EDPs) in aquatic environment

Background on the generation of the problems of endocrine disrupting pesticides (EDPs) in aquatic environment, characteristics of EDPs, adverse effects and their effect mechanism of EDPs on human and wildlife, the transportation and degradation pathways of EDPs in water and analysis methods of EDPs in water were reviewed. The importance of EDPs in water should be attached to adverse effects on wildlife and human health. It was advised to estab- lish research programs on EDPs in aquatic environment es- pecially in water supply source.