Cu-Co双金属氢氧化物非均相类芬顿催化剂去除磺胺甲恶唑  

Degradation of sulfamethoxazole using the heterogeneous Fenton-like catalyst of Cu-Co bimetallic hydroxide

作　　者：曾佚浩 陈运进 卢耀斌 曾翠平 刘广立 骆海萍 张仁铎 ZENG Yihao;CHEN Yunjin;LU Yaobin;ZENG Cuiping;LIU Guangli;LUO Haiping;ZHANG Renduo(Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology,School of Environmental Science and Engineering,Sun Yat-Sen University,Guangzhou 510006,China;Guangzhou Jingxi Underground Water Purification Plant,Guangzhou 510655,China)

机构地区：[1]中山大学环境科学与工程学院,广东省环境污染控制与修复技术重点实验室,广州510006 [2]广州京溪地下净水厂,广州510655

出　　处：《环境工程学报》2020年第9期2474-2484,共11页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(51608547,51278500,51308557);国家重点研发计划资助项目(2017YFB0903703);广州市科技计划项目(201804010450)。

摘　　要：作为一种广谱性抗生素,磺胺甲恶唑(SMX)在常规城市污水生物处理过程中去除率较低,仍需要发展高效的去除方法。为此,通过原位溶剂热生长法,在碳毡上合成Cu-Co双金属氢氧化物(CuCo-BH)非均相催化剂,且在此基础上开展了类芬顿催化剂催化降解SMX的研究。对催化剂的SEM、TEM、XPS和XRD表征结果表明,CuCo-BH在碳毡上异向生长并呈棒状结构,宽度为40~115 nm,最大长度可达650 nm。在生长温度为105℃、反应时间为5 h的条件下,制备得到性能较好的CuCo-BH催化剂,在pH=7、H2O2=50 mmol·L^−1、反应时间60 min的条件下,对初始浓度为50 mg·L^−1的SMX去除率达到100%;在SMX=3 mg·L^−1、H2O2=15 mmol·L^−1、pH=7、反应时间为30 min的条件下,催化剂重复使用5次,SMX的去除率仍高于94%。·OH和O2^-的淬灭实验以及电子顺磁共振波谱仪(ESR)的测定分析结果表明,·OH对SMX的降解起到了关键的作用。以上研究结果可为SMX在污水深度处理中的高效去除提供一种新的方法。Sulfamethoxazole(SMX)is a kind of broad-spectrum antibiotic.Its removal rate is low in the conventional biological treatment of municipal wastewater,and thus it is necessary to develop efficient methods for SMX removal.In this study,Cu-Co bimetal hydroxide heterogeneous(CuCo-BH)catalyst was synthesized on carbon felt by in-situ solvothermal growth method,and then was applied in the heterogeneous Fenton-like process for SMX degradation.The results of SEM,TEM,XPS and XRD showed that the catalyst anisotropically grew on the carbon felt and developed a rod-like structure with the width of 40~115 nm and the maximum length of 650 nm.The CuCo-BH catalyst with good performance was synthesized under the conditions of growth temperature 105℃ and growth time 5 h.At pH=7,H2O2=50 mmol·L−1,reaction time of 60 min and initial SMX concentration of 50 mg·L^−1,the removal rate of SMX reached 100%using our catalyst.The SMX removal maintained above 94%after the catalyst was recycled for 5 times under the conditions of SMX=3 mg·L^−1,H2O2=15 mmol·L^−1,pH=7,and reaction time of 30 min.The quenching experiments of·OH and O2^- ,and electron paramagnetic resonance spectrometer measurements showed that hydroxyl radical played a key role in the degradation of SMX.This study provides a new method for the efficient SMX removal in advanced wastewater treatment.

关 键 词：双金属氢氧化物 非均相类芬顿 磺胺甲恶唑 催化机理 

分 类 号：X703[环境科学与工程—环境工程]