The conversion of CO₂ into high-value fuels and industrial chemicals using solar energy has always been a popular research topic, and the development of highly active and stable photocatalysts is the key. In the present work, a direct Z-scheme heterojunction composite of tubular g-C₃N₄(TCN) and amino-functionalized UiO-66(UNH) were synthesized by solvothermal method. XRD, SEM and XPS showed that UNH grew in situ on the surface of the tubular structure of TCN and there was a close interaction via “–CO–NH–” covalent bonding between them. Photocatalytic CO₂ reduction experiments exhibited that the composite T/U-0.65 possessed the optimal catalytic performance, with CH₄ yields 14.85 times and 3 times higher than those of pure TCN and pure UNH, respectively. In addition, T/U-0.65 had excellent cycle stability, maintaining a CH₄ yield of 89.25% through the 8th cycle. Photoelectrochemical characterization and ESR radical trapping experiments further demonstrated that the heterojunction composition was conducive to the photocatalytic reduction of CO₂ activity.

中文翻译：

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UiO-66-NH2 和管状 g-C3N4 的直接 Z 型异质结的制备，用于 CO2 稳定光催化还原为 CO 和 CH4


利用太阳能将CO ₂转化为高价值燃料和工业化学品一直是热门的研究课题，而开发高活性和稳定的光催化剂是关键。在本工作中，通过溶剂热法合成了管状gC ₃ N ₄ (TCN)和氨基功能化UiO-66(UNH)的直接Z型异质结复合材料。 XRD、SEM和XPS表明UNH在TCN管状结构的表面原位生长，并且它们之间通过“-CO-NH-”共价键存在紧密的相互作用。光催化CO ₂还原实验表明，复合材料T/U-0.65具有最佳的催化性能，CH ₄收率分别是纯TCN和纯UNH的14.85倍和3倍。此外，T/U-0.65具有优异的循环稳定性，在第8次循环中CH ₄收率保持在89.25%。光电化学表征和ESR自由基捕获实验进一步证明异质结组合物有利于光催化还原CO ₂活性。