Inorganic Chemicals Industry >

2025 , Vol. 57 >Issue 3: 124 - 132

DOI: https://doi.org/10.19964/j.issn.1006-4990.2024-0369

Catalytic Materials

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

  • LI Zihan ,
  • ZHANG Jiaqi ,
  • LI Shizhuo ,
  • LI Xinyu ,
  • LIU Shaozhuo ,
  • WANG Yihao ,
  • HAO Yucui ,
  • LIU Jian ,
  • LI Yanhua
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  • 1. School of New Materials and Chemical Engineering，Tangshan University，Tangshan 063099，China
    2. Jijianlian（Tangshan） Environmental Testing Technology Co. ，Ltd. ，Tangshan 063010，China

Received date: 2024-07-01

  Online published: 2025-03-21

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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

Cite this article

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-C3N4 composite photocatalyst[J]. Inorganic Chemicals Industry, 2025 , 57(3) : 124 -132 . DOI: 10.19964/j.issn.1006-4990.2024-0369

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