The Z-scheme CeO₂/BiOI (C/B) was prepared and evaluated for its photocatalytic RhB degradation and selective oxidation of benzylamine to N-benzylidenebenzylamine under visible light irradiation. Close contacts and chemical interactions between CeO₂ and BiOI which are important for efficient charge transfer in the heterojunction were revealed by HRTEM and XPS studies. The C/B heterostructure presented nearly 1.5 and 8.0 times higher RhB degradation activity than BiOI and CeO₂, respectively. The activity of C/B in oxidative coupling of benzylamine was also firstly revealed and found to be more than 2 times higher than both BiOI and CeO₂. Such enhanced photocatalytic performance of the C/B is ascribed to the combined effects of extended visible-light absorption range, increased surface area and improved charge transfer efficiency as evidenced from BET, UV–vis DRS and photoelectrochemical studies. Based on XPS, UV–vis DRS, Mott-Schottky plots and active species quenching results, a Z-scheme charge transfer where photogenerated electron-hole pairs can be effectively separated is proposed for the C/B and h⁺ and O₂^●– are key active species responsible for RhB degradation and N-benzylidenebenzylamine formation. The present work highlights the enhancement of photocatalytic activity based on Z-scheme heterojunction formation and reveals a further application of photocatalysts in organic fine chemical syntheses.

制备Z方案CeO ₂ / BiOI（C / B），并在可见光照射下评估其光催化RhB降解和苄胺选择性氧化为N-亚苄基苄胺。HRTEM和XPS研究揭示了CeO ₂和BiOI之间的紧密接触和化学相互作用，这对于异质结中的有效电荷转移很重要。C / B异质结构分别比BiOI和CeO _2的RhB降解活性高1.5到8.0倍。还首次揭示了C / B在苄胺氧化偶联中的活性，发现其比BiOI和CeO ₂均高2倍以上。。C / B的这种增强的光催化性能归因于扩大的可见光吸收范围，增加的表面积和改善的电荷转移效率的综合作用，这从BET，UV-vis DRS和光电化学研究中得到了证明。基于XPS，UV-vis DRS，Mott-Schottky图和活性物种猝灭结果，提出了一种Z方案电荷转移，其中可以有效分离C / B和h ⁺和O ₂ ^●的光生电子-空穴对^。是负责RhB降解和N-亚苄基苄胺的形成。本工作强调了基于Z方案异质结形成的光催化活性的增强，并揭示了光催化剂在有机精细化学合成中的进一步应用。