Synthesis of Carbon Ball Modified g-C3N4 for Improved Photocatalytic Activity†

doi:10.7503/cjcu20170780

Abstract

Abstract:

Carbon balls were prepared by hydrothermal method using glucose as the raw material, and the carbon ball modified g-C₃N₄ samples were synthesized by simple wet chemical method. The results showed that the photocatalytic activities of g-C₃N₄ were improved after being modified by appropriate amount of carbon balls for both degradating 2,4-dichlorophenol and splitting water. And based on the results of steady-state surface photovoltage spectroscopy, photoluminescence spectroscopy, I-V curve and electrochemical impedance spectrometry, it is revealed that the mechanism of improved photocatalytic activity is that carbon balls promote the photogenerated electron transfer of g-C₃N₄, thereby improving the separation of the photogenerated carriers.

Key words: g-C₃N₄, Carbon ball, Modification, Charge transfer and separation, Photocatalysis

CLC Number:

O644

TrendMD:

LIU Chong, LIU Lilai, NIE Jiahui. Synthesis of Carbon Ball Modified g-C₃N₄ for Improved Photocatalytic Activity^†[J]. Chem. J. Chinese Universities, 2018, 39(7): 1511.

Figures/Tables 9

Fig.1 XRD patterns of samples C, C-H(A) and CN, XC-CN(B)

Fig.2 DRS spectra of samples C, CN and XC-CN

Fig.3 SEM images of samples C(A), CN(B) and 1%C-CN(C)

Fig.4 FTIR spectra of samples CN, XC-CN(A) and C, C-H(B)

Fig.5 SPS responses of samples CN and XC-CN in air

Fig.6 PL spectra of samples C, CN and XC-CN

Fig.7 Photocatalytic activities for 2,4-DCP degradation(A) and the production of H2(B) on samples CN and XC-CN^ (A) a. CN; b. 0.1%C-CN; c. 1%C-CN; d. 3%C-CN; e. 5%C-CN.

Fig.8 I-V curves and the electrochemical impedance spectra(EIS, inset) of samples CN, 1%C-CN and 3%C-CN

Fig.9 Schematic illustration of the transfer and separation of photogenerated charges in the carbon ball modified g-C3N4

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Synthesis of Carbon Ball Modified g-C₃N₄ for Improved Photocatalytic Activity^†

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