期刊
JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
卷 91, 期 5, 页码 1257-1265出版社
WILEY
DOI: 10.1002/jctb.4715
关键词
activated carbon fibers; heterogeneous cobalt catalyst; peroxymonosulfate; enhanced activity; dyes
类别
资金
- State Key Program of National Natural Science of China [51133006]
- National Natural Science Foundation of China [51302246]
- Zhejiang Provincial Natural Science Foundation of China [LY14E030013, LY14E030015]
BACKGROUNDThe development of effective and green peroxymonosulfate (PMS) activation processes has attracted considerable attention and still remains a great challenge in the environmental field. Herein, the cobalt catalyst was innovatively supported onto activated carbon fibers (ACFs) to construct an outstanding heterogeneous catalyst, Co@ACFs, for PMS activation. RESULTSCo@ACFs could effectively activate PMS to decompose dyes with about 100% removal rate in 35 min. Co@ACFs maintained its catalytic ability without detectable Co leaching during repeated batch experiments. More importantly, the catalyst presented an enhanced decomposition performance over most reported heterogeneous Co catalysts due to the significant role of ACFs: (i) high adsorption capacity in favor of the enhanced catalytic activity; (ii) ACFs as an electron donor to accelerate Co-II/Co-III cycle thereby speeding up degradation. Combining electron paramagnetic resonance (EPR) with radical scavengers, it was found that both sulfate and hydroxyl radicals (SO4 center dot-, (OH)-O-center dot) were responsible for the degradation of dyes. Unexpectedly, (OH)-O-center dot was the dominant radical, different from the reported mechanism in typical Co/PMS. CONCLUSIONThis study not only paves the way to further develop highly efficient and green PMS activation processes, but also provides a new practical method for application to wastewater remediation. (c) 2015 Society of Chemical Industry
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