高等学校化学学报 ›› 2022, Vol. 43 ›› Issue (7): 20220192.doi: 10.7503/cjcu20220192

• 研究论文 • 上一篇    下一篇

壳聚糖包裹CdSe量子点组装体的水相可见光催化CO2还原

夏雾1,2, 任颖异1, 刘京1, 王锋1()   

  1. 1.华中科技大学化学与化工学院, 能量转换与储存材料化学教育部重点实验室, 材料化学与服役失效湖北省重点实验室, 武汉 430074
    2.吉首大学化学化工学院, 吉首 416000
  • 收稿日期:2022-03-27 出版日期:2022-07-10 发布日期:2022-05-09
  • 通讯作者: 王锋 E-mail:wangfengchem@hust.edu.cn
  • 基金资助:
    国家自然科学基金(21871102)

Chitosan Encapsulated CdSe QDs Assemblies for Visible Light-induced CO2 Reduction in an Aqueous Solution

XIA Wu1,2, REN Yingyi1, LIU Jing1, WANG Feng1()   

  1. 1.School of Chemistry and Chemical Engineering,Key Laboratory of Materials Chemistry for Energy Conversion and Storage,Ministry of Education,Hubei Key Laboratory of Material Chemistry and Service Failure,Huazhong University of Science and Technology,Wuhan 430074,China
    2.College of Chemistry and Chemical Engineering,Jishou University,Jishou 416000,China
  • Received:2022-03-27 Online:2022-07-10 Published:2022-05-09
  • Contact: WANG Feng E-mail:wangfengchem@hust.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21871102)

摘要:

通过壳聚糖(chitosan)中的氨基与MPA-CdSe(MPA=3-巯基丙酸)量子点(QDs)表面Cd2+的配位作用, 构建了MPA-CdSe@chitosan组装体. 壳聚糖中丰富的氨基和疏水结构为量子点提供了富CO2及疏水的微环境, 从而提升了水相光催化CO2还原效率和选择性. 光催化实验结果表明, 在以抗坏血酸钠(NaHA)为电子牺牲体的条件下, MPA-CdSe@chitosan组装体在水中可将CO2光催化还原为CO, CO的生成效率和选择性分别比不含壳聚糖的MPA-CdSe QDs体系提升169倍和8.6倍. 用组装体系光催化60 h后, CO的生成效率为73.6 mmol/g(基于量子点质量), 对应的选择性达到51.0%, 具有良好的稳定性.

关键词: 光催化, CO2还原, 组装体, CdSe量子点, 壳聚糖

Abstract:

MPA-CdSe@chitosan assemblies were constructed through the coordination of amino groups in chitosan to the surface Cd2+ of CdSe quantum dots(QDs). In MPA-CdSe@chitosan assemblies, chitosan with abundant amino groups and hydrophobic polymeric structure provides a CO2-rich and hydrophobic micro-environment for QDs, thereby promoting the efficiency and selectivity of photocatalytic CO2-to-CO conversion in an aqueous solution. The photocatalytic CO formation efficiency and selectivity of the MPA-CdSe@chitosan assemblies are 169 times and 8.6 times higher, respectively, than those of MPA-CdSe QDs system without chitosan. The MPA-CdSe@chitosan assemblies exhibited good stability of producing CO with an efficiency of 73.6 mmol/g(based on QDs’ mass) and a selectivity of 51.0% after 60 h of photocatalysis.

Key words: Photocatalysis, CO2 reduction, Assembly, CdSe quantum dots, Chitosan

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