Citation: Hongju Han, Min Fu, Yalin Li, Wei Guan, Peng Lu, Xueli Hu. In-situ polymerization for PPy/g-C₃N₄ composites with enhanced visible light photocatalytic performance[J]. Chinese Journal of Catalysis, ;2018, 39(4): 831-840. doi: 10.1016/S1872-2067(17)62997-8 shu

In-situ polymerization for PPy/g-C₃N₄ composites with enhanced visible light photocatalytic performance

Hongju Han ^a, ,
Min Fu ^a ,
Yalin Li ^b ,
Wei Guan ^c ,
Peng Lu ^a ,
Xueli Hu ^a

a Chongqing Key Laboratory of Catalysis and New Environmental Materials, College of Environment and Resources, Chongqing Technology and Business University, Chongqing 400067, China;
b Chongqing Shapingba Environmental Monitoring Station, Chongqing 400031, China;
c Chongqing Key Laboratory of Environmental Materials & Remediation Technologies, Chongqing University of Arts and Sciences, Chongqing 402160, China

Received Date: 8 November 2017
Revised Date: 11 December 2017

Fund Project: This work was supported by the Specialized Innovation of Social and People's Livelihood in Chongqing (cstc2016shmszx20012), Converting Outstanding Achievements of University-funded Projects of Chongqing (KJZH17122), National Natural Science Foundation of China (5160080705), Key Laboratory Open Project from CTBU (1556036), Scientific and Technological Research Program of Chongqing Municipal Education Commission (KJ130704), and Innovative Research Project from CTBU (yjscxx2016-060-34).

Polypyrrole-modified graphitic carbon nitride composites (PPy/g-C₃N₄) are fabricated using an in-situ polymerization method to improve the visible light photocatalytic activity of g-C₃N₄. The PPy/g-C₃N₄ is applied to the photocatalytic degradation of methylene blue (MB) under visible light irradiation. Various characterization techniques are employed to investigate the relationship between the structural properties and photoactivities of the as-prepared composites. Results show that the specific surface area of the PPy/g-C₃N₄ composites increases upon assembly of the amorphous PPy nanoparticles on the g-C₃N₄ surface. Owing to the strong conductivity, the PPy can be used as a transition channel for electrons to move onto the g-C₃N₄ surface, thus inhibiting the recombination of photogenerated carriers of g-C₃N₄ and improving the photocatalytic performance. The elevated light adsorption of PPy/g-C₃N₄ composites is attributed to the strong absorption coefficient of PPy. The composite containing 0.75 wt% PPy exhibits a photocatalytic efficiency that is 3 times higher than that of g-C₃N₄in 2 h. Moreover, the degradation kinetics follow a pseudo-first-order model. A detailed photocatalytic mechanism is proposed with·OH and·O₂^- radicals as the main reactive species. The present work provides new insights into the mechanistic understanding of PPy in PPy/g-C₃N₄ composites for environmental applications.
- PPy/g-C₃N₄composites,
- In-situ polymerization,
- Visible light photocatalysis,
- Mechanism,
- Environmental remediation
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In-situ polymerization for PPy/g-C3N4 composites with enhanced visible light photocatalytic performance

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In-situ polymerization for PPy/g-C₃N₄ composites with enhanced visible light photocatalytic performance