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Synthesis of TiO_2/g-C_3N_4 nanocomposites with phosphate–oxygen functional bridges for improved photocatalytic activity

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Chinese Journal of Catalysis 2017年第6期38卷 1072-1078页

作者： Chong Liu Fazal Raziq Zhijun Li Yang Qu Amir Zada Liqiang Jing Key Laboratory of Functional Inorganic Materials Chemistry Heilongjiang University Harbin 150080 Heilongjiang China College of Environmental and Chemical Engineering Heilongjiang University of Science and Technology Harbin 150027 Heilongjiang China

One of the most general methods to enhance the separation of photogenerated carriers for g‐C3N4is to construct a suitable heterojunctional composite,according to the principle of matching energy *** interface contact in the fabricated nanocomposite greatly influences the charge transfer and separation so as to determine the final photocatalytic ***,the role of interface contact is often neglected,and is rarely reported to ***,it is possible to further enhance the photocatalytic activity of g‐C3N4‐based nanocomposite by improving the interfacial ***,phosphate-oxygen(P-O)bridged TiO2/g‐C3N4nanocomposites were successfully synthesized using a simple wet chemical method,and the effects of the P-O functional bridges on the photogenerated charge separation and photocatalytic activity for pollutant degradation and CO2reduction were *** photocatalytic activity of g‐C3N4was greatly improved upon coupling with an appropriate amount of nanocrystalline TiO2,especially with P-O bridged ***‐controlled steady‐state surface photovoltage spectroscopy and photoluminescence spectroscopy analyses revealed clearly the enhancement of photogenerated charge separation of g‐C3N4upon coupling with the P-O bridged TiO2,resulting from the built P-O bridges between TiO2and g‐C3N4so as to promote effective transfer of excited electrons from g‐C3N4to *** enhancement was responsible for the improved photoactivity of the P-O bridged TiO2/g‐C3N4nanocomposite,which exhibited three‐time photocatalytic activity enhancement for2,4‐dichlorophenol degradation and CO2reduction compared with bare g‐***,radical‐trapping experiments revealed that the·OH species formed as hole‐modulated direct intermediates dominated the photocatalytic degradation of2,4‐*** work provides a feasible strategy for the design and synthesis of high‐performance g‐C3N4‐based nanocomposite photocatalysts for pollutant degradation and

关键词： TiO2/graphitic carbon nitride nanocomposite phosphate–oxygen bridge Charge transfer and separation Photocatalysis Carbon dioxide conversion

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