Citation: Gang Nie, Jia Huang, Yezhou Hu, Yaobin Ding, Xiaoyan Han, Heqing Tang. Heterogeneous catalytic activation of peroxymonosulfate for efficient degradation of organic pollutants by magnetic Cu⁰/Fe₃O₄ submicron composites[J]. Chinese Journal of Catalysis, ;2017, 38(2): 227-239. doi: 10.1016/S1872-2067(16)62566-4 shu

Heterogeneous catalytic activation of peroxymonosulfate for efficient degradation of organic pollutants by magnetic Cu⁰/Fe₃O₄ submicron composites

Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education, College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, Hubei China

Received Date: 14 September 2016
Revised Date: 28 October 2016

Fund Project: This work was supported by the National Natural Science Foundation of China (21377169, 21507168), the Fundamental Research Funds for the Central Universities (CZW15078), and the Natural Science Foundation of Hubei Province of China (2014CFC1119, 2015CFB505).

Magnetic Cu⁰/Fe₃O₄ submicron composites were prepared using a hydrothermal method and used as heterogeneous catalysts for the activation of peroxymonosulfate (PMS) and the degradation of organic pollutants. The as-prepared magnetic Cu⁰/Fe₃O₄ submicron composites were composed of Cu⁰ and Fe₃O₄ crystals and had an average size of approximately 220 nm. The Cu⁰/Fe₃O₄ composites could efficiently catalyze the activation of PMS to generate singlet oxygen, and thus induced the rapid degradation of rhodamine B, methylene blue, orange II, phenol and 4-chlorophenol. The use of 0.1 g/L of the Cu⁰/Fe₃O₄ composites induced the complete removal of rhodamine B (20 μmol/L) in 15 min, methylene blue (20 μmol/L) in 5 min, orange II (20 μmol/L) in 10 min, phenol (0.1 mmol/L) in 30 min and 4-chlorophenol (0.1 mmol/L) in 15 min with an initial pH value of 7.0 and a PMS concentration of 0.5 mmol/L. The total organic carbon (TOC) removal higher than 85% for all of these five pollutants was obtained in 30 min when the PMS concentration was 2.5 mmol/L. The rate of degradation was considerably higher than that obtained with Cu⁰ or Fe₃O₄ particles alone. The enhanced catalytic activity of the Cu⁰/Fe₃O₄ composites in the activation of PMS was attributed to the synergistic effect of the Cu⁰ and Fe₃O₄ crystals in the composites. Singlet oxygen was identified as the primary reactive oxygen species responsible for pollutant degradation by electron spin resonance and radical quenching experiments. A possible mechanism for the activation of PMS by Cu⁰/Fe₃O₄ composites is proposed as electron transfer from the organic pollutants to PMS induces the activation of PMS to generate ¹O₂, which induces the degradation of the organic pollutants. As a magnetic catalyst, the Cu⁰/Fe₃O₄ composites were easily recovered by magnetic separation, and exhibited excellent stability over five successive degradation cycles. The present study provides a facile and green heterogeneous catalysis method for the oxidative removal of organic pollutants.
- Heterogeneous catalysis,
- Magnetic Cu⁰/Fe₃O₄ composite,
- Peroxymonosulfate,
- Singlet oxygen,
- Oxidative degradation
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Heterogeneous catalytic activation of peroxymonosulfate for efficient degradation of organic pollutants by magnetic Cu0/Fe3O4 submicron composites

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Heterogeneous catalytic activation of peroxymonosulfate for efficient degradation of organic pollutants by magnetic Cu⁰/Fe₃O₄ submicron composites