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Synthesis, Property Characterization and Photocatalytic Activity of Novel Mulriple Polymer Polyaniline/Bi2SnTiO7
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1  State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210093, China

Abstract: Novel mulriple polymer polyaniline/Bi2SnTiO7 was synthesized by chemical oxidation in-situ polymerization method and sol-gel method for the first time. The structural and photocatalytic properties of novel polyaniline/Bi2SnTiO7 have been characterized by X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy and X-ray spectrometry. The photocatalytic degradation of methylene blue was realized under visible light irradiation with novel polyaniline/Bi2SnTiO7 as catalyst. The results showed that novel polyaniline/Bi2SnTiO7 owned higher catalytic activity compared with Bi2SnTiO7 or pure TiO2 or N-doped TiO2 for photocatalytic degradation of methylene blue under visible light irradiation. The photocatalytic degradation of methylene blue with novel polyaniline/Bi2SnTiO7 or N-doped TiO2 as catalyst followed the first-order reaction kinetics, and the first-order rate constant was 0.01350 or 0.00333 min-1. After visible light irradiation for 220 min with novel polyaniline/Bi2SnTiO7 as catalyst, complete removal and mineralization of methylene blue was observed. The reduction of the total organic carbon, the formation of inorganic products, SO42- and NO3-, and the evolution of CO2 revealed the continuous mineralization of methylene blue during the photocatalytic process. The possible photocatalytic degradation pathway of methylene blue was obtained under visible light irradiation. Novel mulriple polymer polyaniline/Bi2SnTiO7/(visible light) photocatalysis system was found to be suitable for textile industry wastewater treatment and could be used to solve other environmental chemical pollution problems.
Keywords: Polyaniline/Bi2SnTiO7; synthesis; property; photocatalytic activity; methylene blue; visible light irradiation; photodegradation pathway