Citation: Chong Liu, Fazal Raziq, Zhijun Li, Yang Qu, Amir Zada, Liqiang Jing. Synthesis of TiO₂/g-C₃N₄ nanocomposites with phosphate-oxygen functional bridges for improved photocatalytic activity[J]. Chinese Journal of Catalysis, ;2017, 38(6): 1072-1078. doi: 10.1016/S1872-2067(17)62850-X shu

Synthesis of TiO₂/g-C₃N₄ nanocomposites with phosphate-oxygen functional bridges for improved photocatalytic activity

Chong Liu ^a,b, ,
Fazal Raziq ^a ,
Zhijun Li ^a ,
Yang Qu ^a ,
Amir Zada ^a ,
Liqiang Jing ^a

a. Key Laboratory of Functional Inorganic Materials Chemistry, Heilongjiang University, Harbin 150080, Heilongjiang, China;
b. College of Environmental and Chemical Engineering, Heilongjiang University of Science and Technology, Harbin 150027, Heilongjiang, China

Received Date: 23 March 2017
Revised Date: 19 April 2017

Fund Project: This work was supported by the National Natural Science Foundation of China (U1401245, 91622119), the Program for Innovative Research Team in Chinese Universities (IRT1237), the Research Project of Chinese Ministry of Education (213011A), and the Science Foundation for Excellent Youth of Harbin City of China (2014RFYXJ002)

One of the most general methods to enhance the separation of photogenerated carriers for g-C₃N₄ is to construct a suitable heterojunctional composite, according to the principle of matching energy levels. The interface contact in the fabricated nanocomposite greatly influences the charge transfer and separation so as to determine the final photocatalytic activities. However, the role of interface contact is often neglected, and is rarely reported to date. Hence, it is possible to further enhance the photocatalytic activity of g-C₃N₄-based nanocomposite by improving the interfacial connection. Herein, phosphate-oxygen (P-O) bridged TiO₂/g-C₃N₄ nanocomposites 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 CO₂ reduction were investigated. The photocatalytic activity of g-C₃N₄ was greatly improved upon coupling with an appropriate amount of nanocrystalline TiO₂, especially with P-O bridged TiO₂. Atmosphere-controlled steady-state surface photovoltage spectroscopy and photoluminescence spectroscopy analyses revealed clearly the enhancement of photogenerated charge separation of g-C₃N₄ upon coupling with the P-O bridged TiO₂, resulting from the built P-O bridges between TiO₂ and g-C₃N₄ so as to promote effective transfer of excited electrons from g-C₃N₄ to TiO₂. This enhancement was responsible for the improved photoactivity of the P-O bridged TiO₂/g-C₃N₄ nanocomposite, which exhibited three-time photocatalytic activity enhancement for 2,4-dichlorophenol degradation and CO₂ reduction compared with bare g-C₃N₄. Furthermore, radical-trapping experiments revealed that the ·OH species formed as hole-modulated direct intermediates dominated the photocatalytic degradation of 2,4-dichlorophenol. This work provides a feasible strategy for the design and synthesis of high-performance g-C₃N₄-based nanocomposite photocatalysts for pollutant degradation and CO₂ reduction.
- TiO₂/graphitic carbon nitride nanocomposite,
- Phosphate-oxygen bridge,
- Charge transfer and separation,
- Photocatalysis,
- Carbon dioxide conversion
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Synthesis of TiO₂/g-C₃N₄ nanocomposites with phosphate-oxygen functional bridges for improved photocatalytic activity