Morphology and band structure regulation of graphitic carbon nitride microspheres by solvothermal temperature to boost photocatalytic activity

Applied Physics A Solids and Surfaces - Tập 124 - Trang 1-11 - 2018
Shuaijun Wang1,2, Qingyun Yan1,2, Pei Dong1,2, Chaocheng Zhao1,2, Yongqiang Wang1,2, Fang Liu1,2, Lin Li1,2,3
1College of Chemical Engineering, China University of Petroleum Huadong, Qingdao, People’s Republic of China
2State Key Laboratory of Petroleum Pollution Control, Changping, Beijing, People’s Republic of China
3College of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao, People’s Republic of China

Tóm tắt

Graphitic carbon nitride (g-C3N4) microspheres (CNMS) were fabricated via a solvothermal method by using supramolecular complexes of dicyandiamide and cyanuric chloride as precursors. The effect of solvothermal temperature on the morphology, band structure, and activity was systematically investigated. Structural characterization results indicate that the samples prepared at 180 °C (CNMS-180) and 200 °C (CNMS-200) possess spherical morphology, while irregular bulk particles were obtained at 160 °C (CN-160). In addition, the band gap increased as the solvothermal temperature decreased from 200 to 160 °C. In comparison with CN-160 and CNMS-200, the valence band of CNMS-180 was more positive and thus gives higher photo-oxidation capability. Accordingly, CNMS-180 exhibits higher photocatalytic degradation efficiency on Rhodamine B, stronger photocurrent response, and lower charge transfer resistance. Additionally, CNMS-180 exhibits excellent stability after four runs. This work might provide a guidance for the regulation of morphology and band structure of g-C3N4-based materials prepared at low temperatures.

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