Preparation and photocatalytic performance of carbon dots/g-C3N4 composite catalyst

被引：0

作者：

Hao C. ^{[1
]}

Yang Z. ^{[1
]}

Chang Q. ^{[1
]}

Xue C. ^{[1
]}

Li N. ^{[1
]}

Hu S. ^{[1
]}

机构：

[1] School of Energy and Power Engineering, North University of China, Taiyuan

来源：

Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2023年 / 40卷 / 10期

基金：

中国国家自然科学基金;

关键词：

carbon dots; composite catalyst; degradation; g-C[!sub]3[!/sub]N[!sub]4[!/sub; photocatalysis; rhodamine B;

D O I：

10.13801/j.cnki.fhclxb.20230720.001

中图分类号：

学科分类号：

摘要：

The light absorption and photo-induced carrier recombination of g-C3N4 are the key problems that limit its efficient photocatalytic applications. Herein, carbon dots (CDs) were synthesized using coal pitch as precursor and then the CDs/g-C3N4 composite catalyst was prepared by ultrasonic-assisted method. The structure, optical and photoelectrochemical properties of the catalyst were characterized by TEM, XRD, UV-Vis diffuse reflection spectrum, PL spectrum, EIS test and photocurrent response test. The results show that the regulation of band structure and the formation of interface after the introduction of CDs expand the range of light absorption of the composite photocatalyst, promote the effective separation and migration of photogenerated electrons and holes, and thus facilitate the photocatalytic reaction. Using rhodamine B (RhB) as the model, the photocatalytic activity of CDs/gC3N4 composite catalyst is significantly higher than that of pure g-C3N4 under visible light irradiation. The degradation rate of RhB can reach 98.6% within 40 min, and the degradation rate constant of CDs/g-C3N4 is 6.8 times that of g-C3N4. The capture of experiment of active species reveals that •O2− plays a major role in the degradation system. In addition, CDs/g-C3N4 composite catalyst exhibit good stability. After 5 cycles, the degradation rate of RhB is still up to 97.5%, which shows a good application prospect in visible light photocatalysis. © 2023 Beijing University of Aeronautics and Astronautics (BUAA). All rights reserved.

引用

页码：5811 / 5819

页数：8

共 30 条

[11] WU Jianbo, SHI Liang, ZHENG Xiaoqiang, Et al., g-C3N4/ BiOCl composite photocatalyst used as 2D/2D heterojunction for photocatalytic degradation of dyes, Acta Materiae Compositae Sinica, 40, 1, pp. 323-333, (2023)
[12] TANG C S, CHENG M, LAI C, Et al., Recent progress in the applications of non-metal modified graphitic carbon nitride in photocatalysis[J], Coordination Chemistry Reviews, 474, (2023)
[13] LIANG Jiachi, LI Xinqi, ZUO Jianliang, Et al., Morphology control of g-C3N4 with improved photocatalytic performance, New Chemical Materials, 50, 8, pp. 223-228, (2022)
[14] ZHENG Fukai, LI Zonglin, CAO Yuqi, Et al., Cobalt and carbon co-doped carbon nitride for enhanced photocatalytic hydrogen evolution[J], Chinese Journal of Inorganic Chemistry, 37, 11, pp. 2029-2036, (2021)
[15] SARAEV A A, KURENKOVA A Y, ZHURENOK A V, Et al., Selectivity control of CO2 reduction over Pt/g-C3N4 photocatalysts under visible light[J], Catalysts, 13, 2, pp. 273-287, (2023)
[16] WON J H, KIM M K, OH H S, Et al., Scalable production of visible light photocatalysts with extended nanojunctions of WO3/g-C3N4 using zeta potential and phase control in sol-gel process[J], Applied Surface Science, 612, (2023)
[17] FU J W, YU J G, JIANG C J, Et al., g-C3N4-based heterostructured photocatalysts[J], Advanced Energy Materials, 8, 3, (2018)
[18] CHE Wangyuan, LIU Changjun, YANG Kun, Et al., Research progress in preparation, property and applications of fluorescent carbon dots[J], Acta Materiae Compositae Sinica, 33, 3, pp. 431-450, (2016)
[19] CAI T T, LIU B, PANG E N, Et al., A review on the preparation and applications of coal-based fluorescent carbon dots[J], New Carbon Materials, 35, 6, pp. 646-666, (2020)
[20] ZHAO Z X, REISCHAUER S, PIEBER B, Et al., Carbon dot/TiO2 nanocomposites as photocatalysts for metallaphotocatalytic carbon-heteroatom cross-couplings[J], Green Chemistry, 23, 12, pp. 4524-4530, (2021)

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