CdS/g-C3N4复合光催化剂的合成及催化机理研究

doi:10.19964/j.issn.1006-4990.2024-0369

Abstract

Abstract:

g-C₃N₄ yellow powder was prepared by sintering and ultrasonic two-step method using melamine as raw material.Then the CdS/g-C₃N₄ composite photocatalyst with CdS nanoparticles coated to g-C₃N₄ layer structure was successfully prepared by hydrothermal method using the prepared g-C₃N₄，sodium sulfide and cadmium acetate as raw materials.The phase composition，microstructure，physical and chemical properties of CdS，g-C₃N₄ and CdS/g-C₃N₄ composite photocatalysts were characterized by X-ray diffraction（XRD），field emission scanning electron microscopy（FE-SEM），ultraviolet-visible-infrared diffuse reflectance spectroscopy（UV-Vis-DRS），X-ray fluorescence spectroscopy（XRF）and X-ray photoelectron spectroscopy（XPS）.The test results showed that the microstructure of prepared CdS was nanoparticle and g-C₃N₄ was lamellar structure.In the CdS/g-C₃N₄ composite materials，the g-C₃N₄ layer was surrounded by irregular CdS particles，g-C₃N₄ and CdS were closely combined into a whole composite powder particles.The photocatalytic properties of CdS，g-C₃N₄ and CdS/g-C₃N₄ composites were tested using Rhodamine B as target degradation material and xenon lamp as light source.The results showed that CdS/g-C₃N₄ composite photocatalyst had good photocatalytic performance，when the mass ratio of CdS to g-C₃N₄ was 1∶5，the photocatalytic activity of the composite was significantly stronger than that of single CdS or g-C₃N₄ sample.The degradation rate of Rhodanine B reached 93.7% after 40 min illumination，which was in line with the first-order kinetic equation，and the degradation rate was 6.6×10^-2 min^-1.The main active free radical for photodegradation of Rhodamine B was hydroxyl free radical.Based on the mechanism and degradation results，it was speculated that Z-type heterojunction should be formed between CdS and g-C₃N₄.

Key words: CdS/g-C₃N₄, photocatalysis, hydrothermal method, synthesis, catalytic mechanism

CLC Number:

TQ127.1

LI Zihan, ZHANG Jiaqi, LI Shizhuo, LI Xinyu, LIU Shaozhuo, WANG Yihao, HAO Yucui, LIU Jian, LI Yanhua. Study on synthesis and catalytic mechanism of CdS/g-C₃N₄composite photocatalyst[J]. Inorganic Chemicals Industry, 2025, 57(3): 124-132.

Figures/Tables 9

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Study on synthesis and catalytic mechanism of CdS/g-C₃N₄composite photocatalyst

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Study on synthesis and catalytic mechanism of CdS/g-C3N4 composite photocatalyst