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Date of Publication:2017-01-01

Journal:无机材料学报

Volume:32

Issue:4

Page Number:351-356

ISSN No.:1000-324X

Abstract:SiC nanoparticles were synthesized by direct current (DC) arc-discharge plasma method,using bulk Si as silicon source and in a mixed atmosphere of CH4,H2 and Ar.The chemical composition and morphology of the SiC nano product were affected by the pressure of CH4 obviusly.These products were characterized by Transmission electron microscopy (TEM),Raman spectra,Fourier transform infrared (FTIR) spectroscopy,X-ray diffraction (XRD),and X-ray photoelectron spectroscopy (XPS).The results indicate that the product contains the main phases of 3C-and 6H-SiC,while prepared at low CH4 pressure of 0.005 MPa,which exists few Si/SiC core-shell structures in the product.The SiC nanoparticles,prepared at 0.01 MPa CH4,were used as the catalyst to remove the Cl atoms in persistent 2,4-dichlorophenol through photoelectric catalytic reduction.The results show that the SiC nanoparticles have good photoelectric catalytic reductive dechlorination ability under ultraviolet illumination at a constant optical intensity of 500 mW/cm2.The removal efficiency reaches about 92.5％ and the adsorption efficiency is 19.6％ at an appropriate bias potential of-1.02 V after 180 min of photoelectric catalysis.Hence,SiC nanoparticles are identified as a kind of low-cost photoelectrocatalysis candidates to replace noble metals in wastewater treatments.

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