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A novel CoⅡ-Fenton-like heterogeneous catalyst,(H3O)2[Co1(phen)(H2O)2]2[MoⅥ5O15(PO4)2]·4H2O (phen=l,10-phenanthro-line,C12N2H8) (1),is synthesized and utilized for photocatalytic degradation of organic dyes and antibiotic in a wide range of pH.The experimental results show that 1 acting as the Fenton-like catalyst with H2O2 exhibits remarkable activity at pH 3-9 under vis-light irradiation and is merited with excellent recyclability and reusability.A variety of analytical methods,including in-situ electron paramagnetic resonance (EPR) spectroscopy and density functional theory (DFT) calculations,are applied to study the mechanism on generation of ·OH and O2·- radicals for photocatalytic degradation.It suggests that,unlike the classical Fenton process involving the redox transformation of the central cations,the generation of ·OH and O2·- radicals is associated with the substitution of the coordinating water molecules at Co(Ⅱ) by H2O2 and/or OOH-,followed by the light-driven O-O bond cleavage and dissociation.The outcomes of this study are striking which overcome the obstacles in the classical FeⅡ-Fenton process,including the slow redox transformation between Fe(Ⅱ) and Fe(Ⅲ) and the production of massive iron precipitates especially at elevated pH.It opens up new avenues for the development of the high-performance Fenton(-like) catalysts for photocatalytic degradation over extended pH and provides new insight into the related process.
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篇名 A novel heterogeneous Co(Ⅱ)-Fenton-like catalyst for efficient photodegradation by visible light over extended pH
来源期刊 中国科学:化学(英文版) 学科
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年,卷(期) 2020,(12) 所属期刊栏目 ARTICLES
研究方向 页码范围 1825-1836
页数 12页 分类号
字数 语种 英文
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中国科学:化学(英文版)
月刊
1674-7291
11-5839/O6
16开
北京东黄城根北街16号
1950
eng
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4060
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11421
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