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Preparation and photocatalytic activity of TiO2-coated granular activated carbon composites by a molecular adsorption-deposition method

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Abstract

TiO2 nanoparticle-coated granular activated carbon (GAC) composite photocatalysts (CPs) were successfully prepared by a molecular adsorption-deposition (MAD) method. The CPs were detected by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray Photoelectron Spectroscopy (XPS), BET surface area and UV-Vis adsorption spectroscopy, and their photoactivity was evaluated by methyl orange (MO) photodegradation. The results show that small-sized TiO2 nanoparticles were dispersed well, deposited on the surface of GAC, and showed slight blue shift in comparison with pure TiO2. With the increase in TiO2 content, the CPs showed band gaps in lower energy, smaller surface areas and the higher content of Ti3+ ions. Compared with pure TiO2 and others CPs samples, CPs-382 sample showed the highest photoactivity due to the optimum TiO2 content and surface area besides the synergic effect of photocatalytic degradation of TiO2 and adsorptive property of GAC. In addition, the CPs could be very easily reclaimed, recycled and reused for methyl orange removal while high photoactivity is preserved.

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Authors and Affiliations

  1. College of Chemistry and Chemical Engineering, Jishou University, Jishou, 416000, China

    YouJi Li, Jing Li, MingYuan Ma, YuZhu Ouyang & WenBin Yan

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  1. YouJi Li
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  2. Jing Li
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  3. MingYuan Ma
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  4. YuZhu Ouyang
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  5. WenBin Yan
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Correspondence to YouJi Li.

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Supported by the Natural Science Foundation of Hunan Province (Grant No. 06JJ50150), the Scientific Research Fund of Science and Technology Department of Hunan Province (Grant No. 2007GK3060) and Jishou University (Grant No. JSDXKYZZ200648)

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Li, Y., Li, J., Ma, M. et al. Preparation and photocatalytic activity of TiO2-coated granular activated carbon composites by a molecular adsorption-deposition method. Sci. China Ser. B-Chem. 51, 1036–1043 (2008). https://doi.org/10.1007/s11426-008-0115-3

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  • DOI: https://doi.org/10.1007/s11426-008-0115-3

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