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| Effect of P123 on the microstructure and photocatalytic activity of rGO/mesoporous TiO2 films |
| LI Cui-xia, KANG Wei-chao, REN Yi-bo, YANG Zhi-zhong, SHI Xiao, LI Wen-sheng |
| Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China |
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Abstract In this study, self-made GO dispersion liquid and TiO2 precursor sol with a certain amount of the triblock copolymer, (polyethylene oxide, PEO) 20-(polypropylene oxide, PPO) 70-(PEO)20 (P123) were used as raw materials. The reduced graphene oxide/mesoporous TiO2 (rGO/m-TiO2) multilayer films were prepared on glass substrates by alternating dipping-coating combined with heat treatment and ultraviolet lamp irradiation reduction method. The multilayer film was characterized by X-ray diffraction (XRD), Raman spectroscopy (Raman), scanning electron microscopy (SEM), and specific surface area (BET) analysis. The effects of the amount of templating agent P123 on the crystal structure, specific surface area, morphology, pore size distribution, adsorption performance, and photocatalytic performance of the multilayer film were investigated. The photocatalytic degradation of oxytetracycline (OTC) by multilayer film multilayer film was evaluated under ultraviolet light and sunlight. The photocatalytic degradation mechanism was studied under ultraviolet light. The results showed that the crystal structure of TiO2 does not change after adding P123. The optimized pore structure and large specific surface area can be obtained by the introduction of appropriate P123, which are conducive to the adsorption capacity and the photocatalytic activity. The adsorption efficiency of rGO/TiO2 (5wt%P123) film on OTC reached 51.2% for 60min, and the degradation rate of ultraviolet irradiation reached 90.9% for 135 min.The degradation rate reached 91.5% after 50min of sunlight exposure. During the degradation of OTC, hydroxyl radical (·OH) plays a major role in photocatalysis, and hydroxylation and secondary hydroxyl oxidation are the main reaction paths.
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Received: 08 February 2019
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