欢迎访问《环境科学学报》编辑部网站！

快速检索			高级检索

研究报告

Co-catalytic effect of WS₂ on degradation of bisphenol A in Fe²⁺/CaO₂ Fenton-like system

摘要：Fe²⁺/过氧化钙类芬顿体系（Fe²⁺/CaO₂）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WS₂作为Fe²⁺/CaO₂体系的助催化剂以促进Fe³⁺/Fe²⁺快速循环，进而高效降解双酚A（BPA）.在最佳条件下，WS₂/Fe²⁺/CaO₂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（¹O₂）和超氧自由基（·O₂^-）是BPA降解的主要活性氧物种，其中·OH贡献最大.WS₂表面暴露的W⁴⁺还原性位点，促进了Fe²⁺的再生，进一步提高了类芬顿的催化性能.WS₂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.

Abstract：Fe²⁺/CaO₂ Fenton-like system is easily limited by the slow iron ion cycle in practical applications. Herein， commercial WS₂ as a co-catalyst of Fe²⁺/CaO₂ to promote the Fe³⁺/Fe²⁺ 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 WS₂/Fe²⁺/CaO₂ 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 （·O₂^-） and singlet oxygen （¹O₂） were the main reactive oxygen species for BPA degradation， and ·OH contribute most to the degradation of BPA. The exposed W⁴⁺ reductive sites on the surface of WS₂ promoted the regeneration of Fe²⁺ and further improved the catalytic performance of Fenton-like system. WS₂ 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.