摘要
双酚S(BPS)是一种新兴的内分泌干扰物,在环境中广泛存在,并对自然环境和人体健康有严重危害。制备了FeS-Fe^(0)纳米复合材料作为催化剂,明确了FeS-Fe^(0)纳米复合材料活化PS体系(FeS-Fe^(0)/PS体系)的反应条件对去除BPS的影响,包括材料中FeS与Fe^(0)摩尔比、材料投加量、PS浓度、溶液初始pH值等,并应用X射线衍射分析、X射线光电子能谱分析等技术表征该复合材料,通过反应体系对比实验、Fe离子溶出实验、PS的消耗实验、猝灭实验、电子顺磁共振波谱检测,探究了FeS-Fe^(0)纳米复合材料的活化机理。实验结果表明:FeS-Fe^(0)/PS体系降解BPS的最优条件为溶液初始pH=3、FeS与Fe^(0)摩尔比1∶25、材料投加量0.10 g/L、PS浓度1.0 mM;FeS-Fe^(0)/PS体系中产生的硫酸根自由基(SO_(4)^(·-))和羟基自由基(HO·)可降解BPS,且HO·占主导作用;FeS-Fe^(0)纳米复合材料表面的FeS促进了铁离子的溶出和循环,因此其活化能力优于纳米零价铁。
Bisphenol S(BPS)is an emerging endocrine disruptor,which is widespread in the environment and has serious harm to the natural environment and human health.This paper prepares FeS-Fe^(0)nanocomposite as catalysts,and determines the influence of the reaction conditions of FeS-Fe^(0)nanocomposite activated PS system(FeS-Fe^(0)/PS system)on the removal of BPS,including the molar ratio of FeS to Fe^(0)in the FeS-Fe^(0)nanocomposite,the dosage of catalyst,the concentration of oxidant PS,the initial pH of the reaction solution and so on.Using X-ray diffraction,X-ray photoelectron spectroscopy and other techniques to characterize FeS-Fe^(0)nanocomposite,the paper explores the activation mechanism of FeS-Fe^(0)nanocomposite through system comparison experiments,Fe ion dissolution experiments,utilization rate of oxidant PS,quenching experiments and electron spin-resonance spectroscopy.The results show that the optimal conditions for the FeS-Fe^(0)/PS system to degrade BPS are pH=3,n(FeS)∶n(Fe^(0))=1∶25,catalyst dosage 0.10 g/L,PS concentration1.0 mM;the sulfate radicals(SO_(4)^(·-))and hydroxyl radicals(HO·)produced in the FeS-Fe^(0)/PS system can degrade BPS,and HO·occupies a dominant position.FeS on the surface of FeS-Fe^(0)nanocomposite can promote the dissolution and circulation of iron ions,so the ability of Fe^(0)-FeS nanocomposite to activate PS is better than that of nano zero valent iron.
作者
席岩星
杜江坤
魏哲
崔雅云
徐田田
XI Yanxing;DU Jiangkun;WEI Zhe;CUI Yayun;XU Tiantian(School of Environmental Studies,China University of Geosciences(Wuhan),Wuhan 430078,China)
出处
《安全与环境工程》
CAS
CSCD
北大核心
2022年第1期189-198,共10页
Safety and Environmental Engineering
基金
国家自然科学基金项目(41907153)。
