WS_(2)对Fe^(2+)/过氧化钙类芬顿体系降解双酚A的助催化作用  

Co-catalytic effect of WS_(2) on degradation of bisphenol A in Fe^(2+)/CaO_(2) Fentonlike system

作　　者：谢春生 张德 黎素 肖纯 XIE Chunsheng;ZHANG De;LI Su;XIAO Chun(Provincial Key Laboratory of Environmental Health and Land Resource,School of Environmental and Chemical Engineering,Zhaoqing University,Zhaoqing 526061;Zhaoqing Lingyu Environmental Protection Industry Co.,Ltd,Zhaoqing 526061)

机构地区：[1]肇庆学院环境与化学工程学院,广东省环境健康与资源利用重点实验室,肇庆526061 [2]肇庆领誉环保实业有限公司,肇庆526061

出　　处：《环境科学学报》2022年第11期56-65,共10页Acta Scientiae Circumstantiae

基　　金：肇庆市科技创新指导类项目(No.2021040302003);肇庆学院创新科研团队项目。

摘　　要：Fe^(2+)/过氧化钙类芬顿体系(Fe^(2+)/CaO_(2))在实际应用中易受到铁离子循环缓慢的限制.因此,本研究利用商业WS_(2)作为Fe^(2+)/CaO_(2)体系的助催化剂以促进Fe^(3+)/Fe^(2+)快速循环,进而高效降解双酚A(BPA).在最佳条件下,WS_(2)/Fe^(2+)/CaO_(2)体系在15 min内对BPA(10 mg·L^(-1))的降解率为99.7%.同时,该体系展示出良好的应用前景,可适用于多种水体,亦可高效降解多种难降解有机污染物.自由基淬灭实验和EPR分析表明,羟基自由基(·OH)、单线态氧(^(1)O_(2))和超氧自由基(·O_(2)^(-))是BPA降解的主要活性氧物种,其中·OH贡献最大.WS_(2)表面暴露的W^(4+)还原性位点,促进了Fe^(2+)的再生,进一步提高了类芬顿的催化性能.WS_(2)具有良好的稳定性,6次重复循环使用后BPA的降解率仍高达99%.本研究为基于过氧化钙的类芬顿法处理有机废水提供了一种新的见解.Fe^(2+)/CaO_(2) Fenton-like system is easily limited by the slow iron ion cycle in practical applications.Herein,commercial WS_(2) as a co-catalyst of Fe^(2+)/CaO_(2) to promote the Fe^(3+)/Fe^(2+)cycle for efficient degradation of bisphenol A(BPA).Under the optimal conditions,the degradation rate of BPA(10 mg·L^(-1))was 99.7% within 15 min in WS_(2)/Fe^(2+)/CaO_(2) system.Besides,the system could be suitable for various water bodies and degrade other refractory organic pollutants,which showed good application prospects.Radical quenching experiments and EPR analysis showed that hydroxyl radical(·OH),superoxide radical(·O_(2)^(-))and singlet oxygen(^(1)O_(2))were the main reactive oxygen species for BPA degradation,and·OH contribute most to the degradation of BPA.The exposed W^(4+)reductive sites on the surface of WS_(2) promoted the regeneration of Fe^(2+)and further improved the catalytic performance of Fenton-like system.WS_(2) exhibited good stability,and the degradation rate of BPA was still as high as 99% even after six repeated cycles.This study provides a new insight into calcium peroxide-based Fenton-like for the treatment of organic wastewater.

关 键 词：WS_(2) CaO_(2) 类芬顿 双酚A 助催化 

分 类 号：X703[环境科学与工程—环境工程]