The improvement of CO₂ conversion efficiency over semiconductor photocatalysts is usually restricted by their poor CO₂ adsorption capacity. In this work, a zirconium-based organic framework (UiO-66) was introduced as an effective CO₂ adsorbent to couple with TiO₂ photocatalyst. The designed two-step strategy endowed the TiO₂/UiO-66 composite with hierarchical porous structure, which ensured the sufficient exposed catalytic sites and a high CO₂ uptake of 78.9 cm³ g^-1. In consequence, a high CH₄ production rate of 17.9 μmol g^-1 h^-1 with 90.4 % selectivity was achieved in a mild gas-solid system using water as electron donors. Interestingly, the photocatalytic efficiency reached the similar level to that of pure CO₂ atmosphere even under diluted CO₂ condition (≤ 2%). Further, the enhanced mechanism was discussed in detail to present the superiority of such designed composite structure from the aspects of CO₂ enrichment and exposure of sufficient catalytic sites.

相对于半导体光催化剂，CO ₂转化效率的提高通常受到其较差的CO ₂吸附能力的限制。在这项工作中，引入了锆基有机骨架（UiO-66）作为有效的CO ₂吸附剂，并与TiO ₂光催化剂偶联。设计的两步策略使TiO ₂ / UiO-66复合材料具有分层的多孔结构，从而确保了足够的暴露催化位点和78.9 cm ³  g ^-1的高CO ₂吸收率。结果，CH ₄的高生产率为17.9μmolg ^-1 h ^-1在以水为电子给体的温和气固体系中，具有90.4％的选择性。有趣的是，即使在稀释的CO ₂条件下（≤2％），光催化效率也达到了与纯CO ₂气氛相似的水平。此外，从CO ₂富集和足够的催化部位暴露的角度，对增强的机理进行了详细的讨论，以展示这种设计的复合结构的优越性。