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论文类型：期刊论文

发表时间：2012-03-01

发表刊物：SYNTHETIC METALS

收录刊物：SCIE、EI

卷号：162

期号：3-4

页面范围：296-302

ISSN号：0379-6779

关键字：PoPD/TiO2 composite photocatalyst; Methylene blue (MB); Wastewater treatment; Visible light irradiation

摘要：Poly-o-phenylenediamine (PoPD)/TiO2 composite photocatalyst with high activity and easy separation was facilely synthesized using ultraviolet light photoinitiating method. In this method, hydroxyl radicals produced by TiO2 under the ultraviolet light irradiation replaced conventional oxidant such as ammonium persulfate (APS) to induce polymerization of o-phenylenediamine (oPD) monomer on the surface of TiO2. The factors that influence the synthesis of PoPD/TiO2 composite photocatalyst and the optimum reaction conditions were studied thoroughly. The as prepared POPD/TiO2 composite photocatalyst was characterized by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FT-IR), and UV-vis absorption spectra. The results showed that a dense conductive PoPD layer with moderate thickness was formed on the surface of TiO2, which can favor adsorption of organic pollutants and make full use of visible light. The novel PoPD/TiO2 composite catalyst was evaluated for their photocatalytic activity towards the degradation of methylene blue (MB) under visible light irradiation. The results were compared with synthesized pure TiO2 nanoparticles and the enhanced degradation was obtained with PoPD/TiO2 composite photocatalyst. More significantly, the PoPD/TiO2 composite photocatalyst exhibited easy separation and less deactivation after several runs. The advantages of the prepared PoPD/TiO2 composite photocatalysts revealed its great practical potential in photocatalytic reactions. (C) 2011 Elsevier B.V. All rights reserved.