高等学校化学学报 ›› 2015, Vol. 36 ›› Issue (8): 1563-1569.doi: 10.7503/cjcu20150142

• 物理化学 • 上一篇    下一篇

碱化辅助水热法制备高活性CdZnS可见光催化剂

卢勇宏1,2, 吴平霄1,2,3(), 黄俊毅1, 陈理想1,2, 朱能武1, 党志1   

  1. 1. 华南理工大学环境与能源学院, 2. 工业聚集区污染控制与生态修复教育部重点实验室,3. 污染控制与生态修复广东省教育厅重点实验室, 广州 510006
  • 收稿日期:2015-02-11 出版日期:2015-08-10 发布日期:2015-07-17
  • 作者简介:联系人简介: 吴平霄, 男, 博士, 教授, 主要从事环境功能材料研究. E-mail:pppxwu@scut.edu.cn
  • 基金资助:
    国家自然科学基金(批准号: 41472038, 41273122, 41073058)、 广东省科技计划项目(批准号: 2014A020216002)和中央高校基本业务费(批准号: 2015ZP007)资助

Alkaline-assisted Hydrothermal Fabrication of CdZnS with Enhanced Visible-light Photocatalytic Performance

LU Yonghong1,2, WU Pingxiao1,2,3,*(), HUANG Junyi1, TRAN Lytuong1,2, ZHU Nengwu1, DANG Zhi1   

  1. 1. School of Environmental and Energy, Guangzhou 510006, China
    2. Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters, Ministry of Education, Guangzhou 510006, China
    3. Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, South China University of Technology, Guangzhou 510006, China
  • Received:2015-02-11 Online:2015-08-10 Published:2015-07-17
  • Contact: WU Pingxiao E-mail:pppxwu@scut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.41472038, 41273122, 41073058), the Science and Technology Planning Project of Guangdong Province, China(No.2014A020216002) and the Fundamental Research Funds for the Central Universities, China(No.2015ZP007)

摘要:

利用碱化辅助水热法制备CdZnS固溶体可见光催化剂CZS-r[r=n(NaOH)/2n(Cd2++Zn2+)]. 采用X射线衍射仪(XRD)、 场发射扫描电子显微镜(FESEM)、 透射电子显微镜(TEM)、 氮气吸附-脱附仪和紫外-可见漫反射光谱仪(UV-Vis DRS)等对材料的晶体结构、 微观结构及带隙能量(Eg)进行了表征. 结果表明, 碱化辅助能有效减小晶体的粒径, 提高颗粒的分散性, 增大材料的比表面积, 并使得材料的带隙宽度变大, 最值得注意的是, 晶体中堆叠层错结构具有的独特界面电位能有效分离光生电子和空穴, 阻碍其复合, 从而显著提高材料的可见光催化制氢活性. 材料的可见光(λ≥420 nm)催化还原制氢实验结果表明, CZS-0.5的5 h平均产氢速率为2154 μmol/(h·g), 是CZS-0[72 μmol/(h·g)]的29.92倍.

关键词: 碱化辅助水热法, 硫化锌镉, 可见光催化剂, 制氢

Abstract:

A series of visible-light photocatalysts, CdZnS[CZS-r, r=n(NaOH)/2n(Cd2++Zn2+)] solid solution, was fabricated by alkaline-assisted hydrothermal method. The crystal structure, microstructure and band gap energy(Eg) of the as-synthesized crystals were characterized by multiple techniques including powder X-ray diffraction(XRD), field emission scanning electron microscopy(FESEM), transmission electron microscopy(TEM), Brunauer-Emmett-Teller(BET) surface area analysis and solid-state UV-Vis diffuse reflectance spectra(UV-Vis DRS). The results showed that alkaline-assisted method can significantly lower the size of the crystals, improve the dispersibility of the particles, enlarge the specific surface area of the semiconductors and introduce the stacking faults. Additionally, the photocatalytic properties of the CzS-r samples were evaluated by hydrogen generation under the irradiation of visible light(λ≥420 nm). It has been found that CZS-0.5 possessed the 5 h average hydrogen production rate of 2154 μmol/(h·g), 29.92 times that of CZS-0[72 μmol/(h·g)], which is mainly ascribed to the unique potential provided by the stacking faults.

Key words: Alkaline-assisted hydrothermal method, CdZnS, Visible-light photocatalyst, Hydrogen production

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