无机盐工业
主管:中海油天津化工研究设计院有限公司
主办:中海油天津化工研究设计院有限公司
   中海油炼油化工科学研究院(北京)有限公司
   中国化工学会无机酸碱盐专业委员会
ISSN 1006-4990 CN 12-1069/TQ

无机盐工业 ›› 2025, Vol. 57 ›› Issue (3): 124-132.doi: 10.19964/j.issn.1006-4990.2024-0369

• 催化材料 • 上一篇    

CdS/g-C3N4复合光催化剂的合成及催化机理研究

李子罕1(), 张佳琦1, 李世卓1, 李欣雨1, 刘少卓1, 王一豪1, 郝玉翠1(), 刘剑1, 李彦华2   

  1. 1.唐山学院新材料与化学工程学院,河北 唐山 063099
    2.冀检联(唐山)环境检测技术有限公司,河北 唐山 063010
  • 收稿日期:2024-07-01 出版日期:2025-03-10 发布日期:2025-03-21
  • 通讯作者: 郝玉翠(1980— ),女,硕士,副教授,主要从事环境材料研究;E-mail:zljzjh0001@163.com
  • 作者简介:李子罕(2002— ),男,学士在读,主要从事环境材料研究;E-mail:1156646896@qq.com
  • 基金资助:
    唐山市科技计划项目(22130218G);校企合作技术研发项目(JJL202401)

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

LI Zihan1(), ZHANG Jiaqi1, LI Shizhuo1, LI Xinyu1, LIU Shaozhuo1, WANG Yihao1, HAO Yucui1(), LIU Jian1, LI Yanhua2   

  1. 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:2024-07-01 Published:2025-03-10 Online:2025-03-21

摘要:

以三聚氰胺为原料,通过烧结-超声两步法制备了g-C3N4黄色粉末;再以所制备g-C3N4、硫化钠和乙酸镉为原料,采用水热法成功制备出了CdS纳米颗粒包裹g-C3N4片层结构的CdS/g-C3N4复合光催化剂。采用X射线衍射(XRD)、场发射扫描电子显微镜(FE-SEM)、紫外可见漫反射(UV-Vis-DRS)、X射线荧光光谱(XRF)、X射线光电子能谱(XPS)等对CdS、g-C3N4和CdS/g-C3N4复合光催化剂进行物相组成、微观形貌及物化性能表征。测试结果表明:所制备CdS的微观形貌为纳米颗粒结构,g-C3N4为片层结构;在CdS/g-C3N4复合材料中,g-C3N4片层周围包裹着不规则颗粒CdS,二者紧密结合成了一个整体的复合粉体颗粒。以罗丹明B为目标降解物,以氙灯模拟可见光光源,测试CdS、g-C3N4和CdS/g-C3N4复合材料的光催化性能。结果表明,CdS/g-C3N4复合光催化剂具有良好的光催化性能,当CdS和g-C3N4质量比为1∶5时,复合材料的光催化活性要明显强于单一CdS或g-C3N4样品的催化活性,光照40 min后罗丹明B的降解率可达93.7%,降解过程符合一级动力学方程,其降解速率为6.6×10-2 min-1。通过捕获实验分析得到光降解罗丹明B的主要活性基团为羟基自由基,基于机理和降解结果分析,推测CdS和g-C3N4之间应该是形成了Z型异质结。

关键词: CdS/g-C3N4, 光催化, 水热法, 合成, 催化机理

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

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