Enhanced photocatalytic performance of polymeric C3N4 doped with theobromine composed of an imidazole ring and a pyrimidine ring

doi:10.1016/S1872-2067(19)63337-1

Chinese Journal of Catalysis ›› 2019, Vol. 40 ›› Issue (6): 875-885.DOI: 10.1016/S1872-2067(19)63337-1

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Enhanced photocatalytic performance of polymeric C₃N₄ doped with theobromine composed of an imidazole ring and a pyrimidine ring

Zehao Li^a, Qian Yang^a, Chengcheng Chen^a, Zhengguo Zhang^a,b, Xiaoming Fang^a,b,c

a Key Laboratory of Enhanced Heat Transfer and Energy Conservation, The Ministry of Education, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China;
b Guangdong Engineering Technology Research Center of Efficient Heat Storage and Application, South China University of Technology, Guangzhou 510640, Guangdong, China;
c Key Laboratory Fuel Cell Technology Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, Guangdong, China

Received:2018-11-13 Revised:2019-02-26 Online:2019-06-18 Published:2019-04-26
Contact: S1872-2067(19)63337-1
Supported by:
This work was supported by the National Natural Science Foundation of China (21276088, U1507201), Natural Science Foundation of Guangdong Province (2014A030312009), and China Postdoctoral Science Foundation (2018M640784).

Abstract

Abstract:

Molecular doping has been proven to be an effective approach to adjusting the electronic structure of polymeric carbon nitride (PCN) and thus improving its optical properties and photocatalytic activity. Herein, theobromine, a compound composed of an imidazole ring and a pyrimidine ring, was first copolymerized with urea to prepared doped PCN. Experimental investigations and theoretical calculations indicate that, a narrowing in band gap and a positive shift in valence band positon happened to the theobromine doped PCN, owing to the synergistic effect between the pyrimidine ring and the imidazole ring in the theobromine molecule. Moreover, it is shown that the doping with theobromine at a suitable mass fraction makes the obtained sample exhibit decreased photoluminescent emission, enhanced photocurrent density, and reduced charge-transport resistance. Consequently, an enhancement in the photocatalytic activity for water oxidation is found for the sample, which oxygen evolution rate is 4.43 times higher than that of the undoped PCN. This work sheds light on the choice of the molecular dopants for PCN to improve its photocatalytic performance.

Key words: Polymeric carbon nitride, Molecular doping, Theobromine, Photocatalytic oxygen evolution, Dye degradation

Zehao Li, Qian Yang, Chengcheng Chen, Zhengguo Zhang, Xiaoming Fang. Enhanced photocatalytic performance of polymeric C₃N₄ doped with theobromine composed of an imidazole ring and a pyrimidine ring[J]. Chinese Journal of Catalysis, 2019, 40(6): 875-885.

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Enhanced photocatalytic performance of polymeric C₃N₄ doped with theobromine composed of an imidazole ring and a pyrimidine ring

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