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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received December 2, 2014
Accepted May 12, 2015

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Preparation of titanium dioxide/tungsten disulfide composite photocatalysts with enhanced photocatalytic activity under visible light

Lili Zheng Weiping Zhang Xinyan Xiao^†

School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China

Korean Journal of Chemical Engineering, January 2016, 33(1), 107-113(7), 10.1007/s11814-015-0098-7

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Abstract

Titanium dioxide/tungsten disulfide (TiO2/WS2) composite photocatalysts were fabricated via a one-step hydrothermal synthesis process, using TiCl4 as titanium source and bulk WS2 as sensitizer. The morphology, structure, specific surface area and optical absorption properties of the composite photocatalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), specific surface area analyzer and ultraviolet-visible diffuse reflection spectrum (UV-vis DRS), respectively. The photocatalytic activity of as-prepared photocatalysts was evaluated by the degradation of methyl orange (MO) under illumination of 500W Xenon lamp. The results indicated that TiO2/WS2 composite photocatalysts possessed excellent photocatalytic activity, and ~95% of the degradation rate for MO was reached when molar ratio of WS2 to TiO2 was 0.004 and the irradiation time was 60 min. Moreover, the carrier trapping experiment and fluorescence spectra showed that ·O2- was the key component in the photocatalytic degradation process and O2 was reduced to be ·O2- by the electrons from the conduction band of TiO2 and WS2 for the degradation of MO.

Keywords

TiO2 Bulk WS2 Visible-light Methyl Orange Photocatalytic Degradation Mechanism

References

Zhu WS, Xu YH, Li HM, Dai BL, Xu H, Wang C, Chao YH, Liu H, Korean J. Chem. Eng., 31, 2 (2014)
Zhao Y, Li CZ, Liu XH, Go F, Du HL, Shi LY, Appl. Catal. B: Environ., 79(3), 208 (2008)
Kadam AN, Dhabbe RS, Kokate MR, Gaikwad YB, Garadkar KM, Spectroc. Acta Pt. A-Molec. Biomolec. Spectr., 133, 669 (2014)
Qin GH, Zhang Y, Ke XB, Tong XL, Sun Z, Liang M, Xue S, Appl. Catal. B: Environ., 129, 599 (2013)
Zhou XF, Lu J, Cao JL, Xu MF, Wang ZS, Ceram. Int., 40, 3975 (2014)
Mahmood A, Woo SI, Korean J. Chem. Eng., 30, 10 (2013)
Jing DW, Guo LJ, Catal. Commun., 8, 795 (2007)
Ho WK, Yu JC, Lin J, Yu JG, Li PS, Langmuir, 20(14), 5865 (2004)
Jang JS, Li W, Oh SH, Lee JS, Chem. Phys. Lett., 425(4-6), 278 (2006)
Hong E, Choi T, Kim JH, Korean J. Chem. Eng., 32, 3 (2015)
Thomalla M, Tributsch H, J. Phys. Chem. B, 110(24), 12167 (2006)
Jana S, Bera P, Chakraborty B, Mitra BC, Mondal A, Appl. Surf. Sci., 317, 154 (2014)
Suwarnkar MB, Dhabbe RS, Kadam AN, Garadkar KM, Ceram. Int., 40, 5489 (2014)
Kaur J, Singhal S, Ceram. Int., 40, 7147 (2014)
Leghari SAK, Sajjad S, Chen F, Zhang JL, Chem. Eng. J., 166(3), 906 (2011)
Liu SS, Huang JF, Cao LY, Li JY, Ouyang HB, Tao XW, Liu C, Mater. Sci. Semicond. Process, 25, 106 (2014)
Nguyen-Phan TD, Pham VH, Chung JS, Chhowalla M, Asefa T, Kim WJ, Shin EW, Appl. Catal. A: Gen., 473, 21 (2014)
Xu DY, Cheng F, Lu QZ, Dai P, Ind. Eng. Chem. Res., 53(7), 2625 (2014)
Li WJ, Li DZ, Xian JJ, Chen W, Hu Y, Shao Y, Fu XZ, J. Phys. Chem. C, 114, 21482 (2010)
Liu WH, Hu QZ, Mo F, Hu JJ, Feng Y, Tang HW, Ye HN, Miao S, J. Mol. Catal. A-Chem., 395, 222 (2014)
Cao J, Luo BD, Lin HL, Xu BY, Chen SF, J. Hazard. Mater., 217, 107 (2012)