As a significant technology of CO₂ utilization, artificial CO₂ photoreduction has received more and more attention. Herein, g-C₃N₄ catalysts modified with Bi and/or Cu for CO₂ photothermal reduction were prepared by solvothermal synthesis and impregnation methods. Performance evaluation and physicochemical and photo- and thermochemical characterization indicated that Bi and Cu modification effectively enhanced the photo-absorption properties of g-C₃N₄ catalysts, improving charge transfer efficiency and catalytic performance. Compared with single-metal modification, Bi and Cu co-modification showed a narrower bandgap and more excellent light and CO₂ absorption capacity, suggesting a certain synergistic effect of Bi and Cu co-modification. The alteration of the light absorption properties may be related to the surface plasmon effect of Bi and Cu, and the co-loading of Bi and Cu can exacerbate the effect, which can effectively enhance the photoresponsivity of the catalysts, leading to higher catalytic performance.

中文翻译：

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负载Bi、Cu的石墨氮化碳催化剂用于二氧化碳光热还原的研究


人工CO ₂光还原作为CO ₂利用的重要技术越来越受到人们的关注。本文通过溶剂热合成和浸渍方法制备了Bi和/或Cu修饰的用于CO ₂光热还原的gC ₃ N ₄催化剂。性能评价以及物理化学和光热化学表征表明，Bi和Cu改性有效增强了gC ₃ N ₄催化剂的光吸收性能，提高了电荷转移效率和催化性能。与单金属修饰相比，Bi和Cu共修饰表现出更窄的带隙和更优异的光和CO ₂吸收能力，表明Bi和Cu共修饰具有一定的协同效应。光吸收性能的改变可能与Bi和Cu的表面等离子体效应有关，Bi和Cu的共负载可以加剧这种效应，从而可以有效增强催化剂的光响应性，从而获得更高的催化性能。