Activation of Persulfate by Magnetic MnFe2O4-bentonite for Catalytic Degradation of 2, 4-Dichlorophenol in Aqueous Solutions

doi:10.1007/s40242-017-6485-3

Chemical Research in Chinese Universities ›› 2017, Vol. 33 ›› Issue (3): 415-421.doi: 10.1007/s40242-017-6485-3

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Activation of Persulfate by Magnetic MnFe₂O₄-bentonite for Catalytic Degradation of 2, 4-Dichlorophenol in Aqueous Solutions

ZHAO Yongsheng, LI Qin, REN Hejun, ZHOU Rui

Key Laboratory of Groundwater Resources and Environment, Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130021, P. R. China

Received:2016-12-08 Revised:2017-04-17 Online:2017-06-01 Published:2017-03-07
Contact: ZHOU Rui,E-mail:zhour@jlu.edu.cn E-mail:zhour@jlu.edu.cn
Supported by:
Supported by the Key Project of the National Natural Science Foundation of China(No.41530636) and the National Natural Science Foundation of China(Nos.41302184, 41471252).

Abstract

Abstract:

Magnetic MnFe₂O₄-bentonite was synthesized by chemical co-precipitation method(CCM) and applied as catalyst in heterogeneous activation of persulfate(PS) to oxidize a target pollutant, 2,4-dichlorophenol(2,4-DCP), in aqueous solutions. The surface morphology and structure of MnFe₂O₄-bentonite were characterized by X-ray diffrac-tion(XRD), scanning electron microscope(SEM), energy dispersive X-ray(EDX) and X-ray photoelectron spectros-copy(XPS) analyses.The catalytic activity of MnFe₂O₄-bentonite for 2,4-DCP degradation was evaluated considering the effects of various process parameters, such as mass ratio of MnFe₂O₄ to bentonite, concentration of catalyst, PS concentration, and pH. The MnFe₂O₄-bentonite hybrid exhibited higher catalytic activity than pure MnFe₂O₄. Treatment with 5 g/L MnFe₂O₄-bentonite at 30℃ for 240 min oxidized 92% of 100 mg/L 2,4-DCP(70.2% mineralization), whereas treatment with pure MnFe₂O₄ under the same condition oxidized only 70% of the pollutant. This result indicate the enhanced performance of the activated PS. Moreover, MnFe₂O₄-bentonite exhibits stable performance with minimal loss in activity after five successive runs. Thus, MnFe₂O₄-bentonite could be a promising catalyst in oxidative degradation of 2,4-DCP.

Key words: 2, 4-Dichlorophenol, Advanced oxidation process, Heterogeneous reaction, MnFe₂O₄-bentonite, Sulfate radical

ZHAO Yongsheng, LI Qin, REN Hejun, ZHOU Rui. Activation of Persulfate by Magnetic MnFe₂O₄-bentonite for Catalytic Degradation of 2, 4-Dichlorophenol in Aqueous Solutions[J]. Chemical Research in Chinese Universities, 2017, 33(3): 415-421.

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Activation of Persulfate by Magnetic MnFe₂O₄-bentonite for Catalytic Degradation of 2, 4-Dichlorophenol in Aqueous Solutions

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