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J Colloid Interface Sci. 2016 Dec 15;484:1-9. doi: 10.1016/j.jcis.2016.08.057. Epub 2016 Aug 24.

Synergistic effect of manganese dioxide and diatomite for fast decolorization and high removal capacity of methyl orange.

Author information

1
College of Resources and Environmental Science, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China.
2
College of Resources and Environmental Science, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China. Electronic address: chenjie_cqu@163.com.
3
College of Optoelectronic Engineering, Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, PR China.
4
College of Materials Science and Engineering, Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, PR China.
5
School of Chemical Engineering, The University of Adelaide, Adelaide, SA 5005, Australia.
6
Chongqing Key Laboratory of Catalysis and Functional Organic Molecules, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, PR China.
7
College of Resources and Environmental Science, State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, PR China; College of Materials Science and Engineering, Key Laboratory of Fundamental Science of Micro/Nano-Devices and System Technology, Chongqing University, Chongqing 400044, PR China. Electronic address: zhangyuxin@cqu.edu.cn.

Abstract

MnO2 nanostructures with two different morphologies (nanowires and nanosheets) were uniformly deposited on diatomite via a one-pot hydrothermal method. The fast decolorization and high removal capacity for anionic dye-MO over synthesized composites had been clarified. The results revealed that the equilibrium time was shortened to as low as 10-30min, and the maximum adsorption capacities were 325mgg-1 and 420mgg-1 for nanowires and nanosheets composites, respectively, under the condition of initial pH 3 and ambient temperature. Indeed, the proposed decolorization mechanism was considered to be simultaneous multi-processes during the dye removal, including physical, physicochemical and chemical process. In principle, well-controlled cost-effective composites have promising ability to remove anionic dye pollutants for environmental remediation.

KEYWORDS:

Decolorization; Diatomite; Manganese dioxide; Methyl orange; Wastewater treatment

PMID:
27572609
DOI:
10.1016/j.jcis.2016.08.057

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