Preparation of Hg-Doped CdS and Degradation of Toxic Organic Pollutants under Visible Light Irradation

doi:10.7517/j.issn.1674-0475.2011.01.11

Abstract

Abstract: Mercury doped CdS nanoparticles was prepared by co-precipitation method.The doped CdS nanoparticles were characterized by X-ray diffraction (XRD),X-ray photoelectron spectroscopy (XPS),transmission electron microscope (TEM) and UV-Vis spectrum.The photo-catalytic degradation of Rhodamine B (RhB) and 2,4-dichlorophenol (2,4-DCP) under visible light were used as probe reactions to evaluate photo-catalytic activities by tracing the UV-Vis spectrum and the total organic carbon (TOC) changes.The results indicated that the best mole rate of Hg was 5% of the total metal amounts with the cubic phase crystal,and the band gap of Hg_0.05Cd_0.95S was 2.15 eV.In 30 minutes,the decolouration of RhB was 100% and the mineralization ratio of RhB was 45.5% in 30 hours,the mineralization of 2,4-DCP was up to 55% in hours with a high stability,the dop of the Hg can efficiently inhibit the photo-corrosion of CdS.The mechanism of degradation were evaluated by electron spin resonance (ESR),the findings showed that the degradation process involved hydroxyl radical course.

Key words: co-precipitation, Hg_xCd_1-xS, Hg-doped, Vis-photocatalysis, degradation

CLC Number:

WANG Pan, CAO Ting-ting, FANG Yan-fen, LUO Guang-fu, LI Rui-ping, HUANG Ying-ping. Preparation of Hg-Doped CdS and Degradation of Toxic Organic Pollutants under Visible Light Irradation[J]. Imaging Science and Photochemistry, 2011, 29(1): 11-23.

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