【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.更多还原

【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 of51.0% after 60 h of photocatalysis.更多还原