Selective transformation of organics by visible-light-driven photocatalysis has been considered as a green and efficient strategy for the synthesis of fine chemicals. Herein, we fabricated mesoporous structured TiO₂ with CdS nanoparticles successfully by a photodeposition method. The photocatalytic selective oxidation of benzyl alcohols and reduction of 4-nitroaniline were demonstrated over the as-prepared samples under visible-light irradiation. The CdS-decorated TiO₂ with the photodeposition time of 90 min exhibited highest activity, which was higher than that of the commercial CdS, bare TiO₂, CdS/P25, and CdS/SiO₂. Further experimental results indicated that the higher performance was attributed to the moderate deposition of CdS forming a closely connected heterojunction with TiO₂, which promoted the separation of photogenerated electrons and holes. Based on the results of active species detection, possible mechanisms for photocatalytic selective oxidation of benzyl alcohol and reduction of 4-nitroaniline were proposed. Our study may provide guidance for selective transformation of organics via construction of heterojunction photocatalysts.

中文翻译：

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CdS / TiO ₂光催化剂上高效可见光驱动的光催化有机转化的新见解

通过可见光驱动的光催化选择性地转化有机物已被认为是合成精细化学品的绿色有效策略。本文中，我们通过光沉积法成功地制备了具有CdS纳米粒子的介孔结构TiO ₂。在可见光照射下，在制备的样品上证明了苄醇的光催化选择性氧化和4-硝基苯胺的还原。光沉积时间为90分钟的CdS修饰的TiO ₂表现出最高的活性，高于商业CdS，裸露的TiO ₂，CdS / P25和CdS / SiO _2的活性。。进一步的实验结果表明，较高的性能归因于CdS的适度沉积，与TiO ₂形成紧密连接的异质结，从而促进了光生电子和空穴的分离。根据活性物质的检测结果，提出了苯甲醇的光催化选择性氧化和4-硝基苯胺还原的可能机理。我们的研究可为通过异质结光催化剂的构建选择性转化有机物提供指导。