The charge separation ability and CO₂ adsorption capacity of photocatalysts are considered to be two very important influencing factors in photocatalytic CO₂ reduction reactions. In this study, mesoporous g-C₃N₄ (MCN) with high specific surface area is synthesized by constructing a mesoporous structure to quantify the relationship between the CO₂ adsorption capacity and the photocatalytic CO₂ reduction activity. Moreover, Ag particles functioned as active sites effectively promote the charge separation efficiency and enhance the photocatalytic activity. More importantly, it is confirmed that the synergistic effect between the mesoporous structure (strong adsorption capacity of CO₂) and Ag particles (effective charge separation) can significantly enhance the photocatalytic activity. The CO evolution rate of 3.0%Ag/mesoporous g-C₃N₄ (Ag/MCN) reaches 1.66 μmol∙g^-1∙h^-1, which is 2.81, 2.41 and 4.37 times that of pristine MCN, 1.0% Ag/bulk g-C₃N₄ (Ag/BCN) and pristine bulk g-C₃N₄ (BCN), respectively. The study provides useful insight into the development of photocatalysts with high activity for CO₂ reduction via controlled structure and surface modification engineering.

光催化剂的电荷分离能力和CO ₂吸附能力被认为是光催化CO ₂还原反应中两个非常重要的影响因素。本研究通过构建介孔结构合成了具有高比表面积的介孔gC ₃ N _{4 (MCN)，以量化CO 2}吸附能力与光催化CO ₂还原活性之间的关系。此外，Ag颗粒作为活性位点有效地提高了电荷分离效率并增强了光催化活性。更重要的是，证实了介孔结构（CO的强吸附能力）之间的协同效应₂）和Ag颗粒（有效的电荷分离）可以显着提高光催化活性。3.0%Ag/介孔gC ₃ N ₄ (Ag/MCN)的CO析出率达到1.66 μmol∙g ^-1 ∙h ^-1，是原始MCN、1.0% Ag/bulk gC的2.81、2.41和4.37倍分别为₃ N ₄ (Ag/BCN) 和原始块状 gC ₃ N ₄ (BCN)。该研究为通过受控结构和表面改性工程开发具有高活性 CO ₂还原的光催化剂提供了有用的见解。