Abstract Photocatalytic CO2 reduction is considered as a feasible approach for solving greenhouse effect and energy shortage. Promoting electron migration and inhibiting electron-hole recombination are key challenges for efficient photocatalytic CO2 reduction. Here, we successfully synthesized Cu:TiO2-CS composite as photocatalyst by a facile solvothermal method to improve the high-catalytic effect on CO2 reduction. The as-prepared composite exhibits excellent photocatalytic CO2 reduction performance under 300 W xenon lamp irradiation, with the yields of CO and CH4 up to 4.48 μmol/g and 5.34 μmol/g, which is 10 times higher than that of TiO2. This impressive amelioration can be attributed to the synergy of organic polymer (chitosan) and inorganic material (Cu:TiO2). This work may provide a constructing guidance in designing the composite photocatalyst concerning CO2 photocatalytic reduction.

中文翻译：

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通过壳聚糖和 Cu:TiO2 之间的协同效应增强光催化 CO2 还原性能

摘要 光催化CO2 还原被认为是解决温室效应和能源短缺的可行途径。促进电子迁移和抑制电子-空穴复合是有效光催化 CO2 还原的关键挑战。在这里，我们通过简便的溶剂热法成功合成了 Cu:TiO2-CS 复合材料作为光催化剂，以提高对 CO2 还原的高催化效果。所制备的复合材料在 300 W 氙灯照射下表现出优异的光催化 CO2 还原性能，CO 和 CH4 的产率分别高达 4.48 μmol/g 和 5.34 μmol/g，是 TiO2 的 10 倍。这种令人印象深刻的改善可归因于有机聚合物（壳聚糖）和无机材料（Cu:TiO2）的协同作用。