Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 65, Issue -, Pages 236-245Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2017.03.003
Keywords
MnO2/Au-NPs nanocomposite; In-situ generation; Dye degradation; Synergistic effect and interfacial effect; Enhanced oxidative degradation
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Funding
- National Natural Science Foundation of China [21277048, 21505046]
- China Postdoctoral Science Foundation [2016 M590336]
- Chenguang Program - Shanghai Education Development Foundation
- Chenguang Program - Shanghai Municipal Education Commission [15CG21]
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In this work, the gold nanoparticles (Au-NPs) were in-situ generated on the surface of MnO2 nanosheets to form MnO2/Au-NPs nanocomposite in a simple and cost-effective way. Multiple experiments were carried out to optimize the oxidation of basic dye (Methylene Blue (MB)), including the molar ratio of MnO2 to chloroauric acid (HAuCl4), the pH of the solution and the effect of initial material. Under the optimal condition, the highest degradation efficiency for MB achieved to 98.9% within 60 min, which was obviously better than commercial MnO2 powders (4.3%) and MnO2 nanosheets (74.2%). The enhanced oxidative degradation might attribute to the in-situ generation of ultra-small and highly-dispersed Au-NPs which enlarged the synergistic effect and/or interfacial effect between MnO2 nanosheets and Au-NPs and facilitated the uptake of electrons by MnO2 from MB during the oxidation, thus validating the application of MnO2/Au-NPs nanocomposite for direct removal of organic dyes from wastewater in a simple and convenient fashion. (C) 2017 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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