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Materials 2014, 7(12), 8024-8036; doi:10.3390/ma7128024

Enhanced Photocatalytic Degradation of Methyl Orange Dye under the Daylight Irradiation over CN-TiO2 Modified with OMS-2

Laboratory of Eco-Environment Engineering Research, Key Laboratory of Arable Land Conservation, Ministry of Agriculture, College of Resources & Environment, Huazhong Agricultural University, Wuhan 430070, China
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Received: 22 October 2014 / Revised: 2 December 2014 / Accepted: 9 December 2014 / Published: 12 December 2014
(This article belongs to the Special Issue Photocatalytic Materials)
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Abstract

In this study, CN-TiO2 was modified with cryptomelane octahedral molecular sieves (OMS-2) by the sol-gel method based on the self-assembly technique to enhance its photocatalytic activity under the daylight irradiation. The synthesized samples were characterized by X-ray diffraction (XRD), UV-vis spectroscopy, Fourier transform infrared spectroscopy (FT-IR) and porosimeter analysis. The results showed that the addition of OMS-2 in the sol lead to higher Brunauer-Emmett-Teller (BET) surface area, pore volume, porosity of particle after heat treatment and the specific surface area, porosity, crystallite size and pore size distribution could be controlled by adjusting the calcination temperature. Compared to the CN-TiO2-400 sample, CN-TiO2/OMS-2-400 exhibited greater red shift in absorption edge of samples in visible region due to the OMS-2 coated. The enhancement of photocatalytic activity of CN-TiO2/OMS-2 composite photocatalyst was subsequently evaluated for the degradation of the methyl orange dye under the daylight irradiation in water. The results showed that the methyl orange dye degradation rate reach to 37.8% for the CN-TiO2/OMS-2-400 sample under the daylight irradiation for 5 h, which was higher than that of reference sample. The enhancement in daylight photocatalytic activities of the CN-TiO2/OMS samples could be attributed to the synergistic effects of OMS-2 coated, larger surface area and red shift in adsorption edge of the prepared sample. View Full-Text
Keywords: CN-codoped; OMS-2; daylight; photocatalysis; TiO2 CN-codoped; OMS-2; daylight; photocatalysis; TiO2
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hassan, M.E.; Chen, J.; Liu, G.; Zhu, D.; Cai, J. Enhanced Photocatalytic Degradation of Methyl Orange Dye under the Daylight Irradiation over CN-TiO2 Modified with OMS-2. Materials 2014, 7, 8024-8036.

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