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Catalysts 2017, 7(1), 19; doi:10.3390/catal7010019

Core-Shell MnO2-SiO2 Nanorods for Catalyzing the Removal of Dyes from Water

Department of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
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Academic Editor: Keith Hohn
Received: 23 November 2016 / Revised: 24 December 2016 / Accepted: 28 December 2016 / Published: 6 January 2017
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Abstract

This work presented a novel core-shell MnO2@m-SiO2 for catalyzing the removal of dyes from wastewater. MnO2 nanorods were sequentially coated with polydopamine (PDA) and polyethyleneimine (PEI) forming MnO2@PDA-PEI. By taking advantage of the positively charged amine groups, MnO2@PDA-PEI was further silicificated, forming MnO2@PDA-PEI-SiO2. After calcination, the composite MnO2@m-SiO2 was finally obtained. MnO2 nanorod is the core and mesoporous SiO2 (m-SiO2) is the shell. MnO2@m-SiO2 has been used to degrade a model dye Rhodamine B (RhB). The shell m-SiO2 functioned to adsorb/enrich and transfer RhB, and the core MnO2 nanorods oxidized RhB. Thus, MnO2@m-SiO2 combines multiple functions together. Experimental results demonstrated that MnO2@m-SiO2 exhibited a much higher efficiency for degradation of RhB than MnO2. The RhB decoloration and degradation efficiencies were 98.7% and 84.9%, respectively. Consecutive use of MnO2@m-SiO2 has demonstrated that MnO2@m-SiO2 can be used to catalyze multiple cycles of RhB degradation. After six cycles of reuse of MnO2@m-SiO2, the RhB decoloration and degradation efficiencies were 98.2% and 71.1%, respectively. View Full-Text
Keywords: MnO2 nanorods; polydopamine; dyes; SiO2 MnO2 nanorods; polydopamine; dyes; SiO2
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MDPI and ACS Style

Gong, W.; Meng, X.; Tang, X.; Ji, P. Core-Shell MnO2-SiO2 Nanorods for Catalyzing the Removal of Dyes from Water. Catalysts 2017, 7, 19.

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