Efficient degradation of clofibric acid by electro-enhanced peroxydisulfate activation with Fe-Cu/SBA-15 catalyst
Efficient degradation of clofibric acid by electro-enhanced peroxydisulfate activation with Fe-Cu/SBA-15 catalyst
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DOI：
10.1016/j.apcatb.2018.02.014
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
Heng Lin;X. Zhong;C. Ciotonea;X. Fan;X. Mao;Yating Li;Bin Deng;Hui Zhang;S. Royer
中科院分区：
文献类型：
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作者：
Heng Lin;X. Zhong;C. Ciotonea;X. Fan;X. Mao;Yating Li;Bin Deng;Hui Zhang;S. Royer
采用介孔氧化硅负载单氧化物和双氧化物在非均相电增强过硫酸盐活化体系中降解氯贝酸。氧化系统包括多相过硫酸盐（PDS，S2O82−）活化与电化学过程相结合，导致产生高活性自由基（SO4自由基dot−和自由基dotOH）。降解反应参数的影响，其中初始溶液pH值，电流密度，S2O82−浓度和催化剂负载量，进行了研究。利用电子顺磁共振（EPR）分析和自由基淬灭实验证实了催化剂产生反应性自由基的效率。根据CFA浓度降低来评价催化性能，而催化剂的稳定性随后通过量化反应期间金属浸出到水溶液中以及反应前后材料表面特性的演变来进行。鉴定了CFA的主要降解中间体，以提出CFA可能的降解途径。
Mesoporous silica supported mono and bimetallic oxides are employed for the degradation of clofibric acid (CFA) in the heterogeneous electro-enhanced persulfate activation system. The oxidation system includes heterogeneous peroxydisulfate (PDS, S2O82−) activation coupled with electrochemical process, leading to the production of highly reactive radicals (SO4radical dot−and radical dotOH). The influence of degradation reaction parameters, amongst the initial solution pH, current density, S2O82−concentration and catalyst loading, is investigated. Efficiency of catalyst to generate reactive radicals is confirmed using electron paramagnetic resonance (EPR) analysis and radical quenching experiments. The catalytic performance was evaluated in terms of CFA concentration abatement, while the stability of catalyst is followed by quantifying the metal leaching into the aqueous solution during reaction and the evolution of surface characteristics of the materials before and after reaction. The main degradation intermediates were identified in order to propose a possible degradation pathway of CFA.