高等学校化学学报 ›› 2021, Vol. 42 ›› Issue (6): 1924.doi: 10.7503/cjcu20200745

• 物理化学 • 上一篇    下一篇

蜂窝状C3N4/CoSe2/GA复合光催化剂的制备及CO2还原性能

王鹏, 阳敏, 汤森培, 陈飞台, 李佑稷()   

  1. 吉首大学化学化工学院, 吉首 416000
  • 收稿日期:2020-10-13 出版日期:2021-06-10 发布日期:2021-06-08
  • 通讯作者: 李佑稷 E-mail:bcclyj@163.com
  • 基金资助:
    国家自然科学基金(21763010);吉首大学校级科研项目(Jdy19019)

Preparation of Cellular C3N4/CoSe2/GA Composite Photocatalyst and Its CO2 Reduction Activity

WANG Peng, YANG Min, TANG Sengpei, CHEN Feitai, LI Youji()   

  1. Department of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China
  • Received:2020-10-13 Online:2021-06-10 Published:2021-06-08
  • Contact: LI Youji E-mail:bcclyj@163.com
  • Supported by:
    the National Natural Science Foundation of China(21763010);the Special Research Project from Jishou University,China(Jdy19019)

摘要:

以六水金氯化钴、 硒粉和尿素为前驱体, 通过水热法合成C3N4/CoSe2纳米粒子, 再将其锚定在石墨烯气凝胶(Graphene aerogel, GA)表面, 制备蜂窝状C3N4/CoSe2/GA光催化剂. 采用X射线衍射(XRD)、 X射线光电子能谱(XPS)、 扫描电子显微镜(SEM)、 透射电子显微镜(TEM)和紫外-可见漫反射光谱(UV-Vis DRS)等手段对材料的结构、 形貌和光学性能进行表征. 同时以氙灯作为模拟可见光光源, 通过CO2光催化还原为CO考察所制备纳米材料的光催化活性. 结果表明, 在C3N4纳米片表面引入了CoSe2和GA并制备出蜂窝状结构 C3N4/CoSe2/GA催化剂, 通过GA, CoSe2与C3N4耦合可以显著提高光吸收密度以及扩展光响应范围, 呈现了更低的荧光强度和最大的电子转移速率. 在同种光催化下, C3N4/CoSe2/GA对CO2还原催化效率最大, CO产量达到5.75 μmol·g-1·h-1, 并且重复使用性能良好.

关键词: 氮化碳, 硒化钴, 石墨烯气凝胶, 二氧化碳还原, 光催化

Abstract:

C3N4/CoSe2 nanoparticles were synthesized by hydrothermal method using cobalt chloride hexahydrate, selenium powder and urea as precursors, and then were anchor on the surface of graphene aerogel(GA) to prepare C3N4/CoSe2/GA photocatalyst. The structure, surface morphology and optical properties of the materials were characterized by X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), transmission electron microscopy(TEM) and UV-Vis diffuse-relective spectroscopy(UV-Vis DRS). At the same time, the photocatalytic activity of the prepared nanomaterials was investigated by reduction of CO2 to CO with using the xenon lamp as visible light source. The results showed that the cellular C3N4/CoSe2/GA catalyst was successfully prepared by introducing CoSe2 and GA on the surface of C3N4 nanometer sheet, and the coupling of GA and CoSe2 with C3N4 could significantly improve the optical absorption density and expand the optical response range, showing lower fluorescence intensity and maximum electron transfer rate. Under the same photocatalysis condition, C3N4/CoSe2/GA displayed the highest catalytic efficiency for CO2 reduction, the CO yield reached 5.75 μmol·g-1·h-1, and the photocatalytic performance was good in repeating process.

Key words: C3N4, CoSe2, Grapheme aerogel, CO2 reduction, Photocatalysis

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