Abstract
Recent improvements in the performance of photocatalysts made it possible to tackle pollution through environment friendly methods. This study investigates the modification of the photocatalytic activity of TiO2 by employing WO3 and conductive polymers, namely, polyaniline (Pani) and polypyrrole (Ppy). Basing on our previous improvement of TiO2 using a conductive polymer and activated carbon (AC), this study determines the activated carbon forms of TiO2. The prepared composites are characterized using X-ray powder diffraction, transmission electron microscopy, Fourier transform infrared, thermogravimetric analysis, Brunauer–Emmet–Teller, and UV–Vis spectroscopy. The specific surface area of the mesoporous composites is as follows: WO3/TiO2·AC (Pani) > WO3/TiO2·AC (Ppy) > WO3/TiO2·Pani > WO3/TiO2·Ppy (127 > 98 > 68 > 44 m2 g−1), which exhibited a similar trend to the photocatalytic performances (100 > 95 > 91 > 72 % conversion rate). This result could be attributed to higher porosity, surge of charge separation, and photo-responding range extension induced by the synergistic effect of WO3, conducting polymers, and TiO2 in the samples.
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Acknowledgments
The authors would like to acknowledge the financial support of the work by the Universiti Kebangsaan Malaysia for funding this project under research Grant: Dana Impak Perdana (DLP-2013-015) and FRGS/1/2012/TK07/UKM/3/4 from Ministry of Higher education (MOHE) Malaysia and Centre of Research and Innovation management (CRIM) UKM.
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Ghoreishi, K.B., Asim, N., Che Ramli, Z.A. et al. Highly efficient photocatalytic degradation of methylene blue using carbonaceous WO3/TiO2 composites. J Porous Mater 23, 629–637 (2016). https://doi.org/10.1007/s10934-015-0117-4
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DOI: https://doi.org/10.1007/s10934-015-0117-4