Wang Wen-Yi, Sang Tian, Zhong Yan, Hu Chao-Hao, Wang Dian-Hui, Ye Jun-Chen, Wei Ni-Ni, Liu Hao
School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China.
Guangxi Key Laboratory of Calcium Carbonate Resources Comprehensive Utilization, Hezhou University, Hezhou 542899, China.
Nanomaterials (Basel). 2022 Nov 7;12(21):3923. doi: 10.3390/nano12213923.
The surfactant modification of catalyst morphology is considered as an effective method to improve photocatalytic performance. In this work, the visible-light-driven composite photocatalyst was obtained by growing CdS nanoparticles in the cubic crystal structure of CdCO, which, after surfactant modification, led to the formation of CdCO elliptical spheres. This reasonable composite-structure-modification design effectively increased the specific surface area, fully exposing the catalytic-activity check point. Cd from CdCO can enter the CdS crystal structure to generate lattice distortion and form hole traps, which productively promoted the separation and transfer of CdS photogenerated electron-hole pairs. The prepared 5-CdS/CdCO@SDS exhibited excellent Cr(VI) photocatalytic activity with a reduction efficiency of 86.9% within 30 min, and the reduction rate was 0.0675 min, which was 15.57 and 14.46 times that of CdS and CdCO, respectively. Finally, the main active substances during the reduction process, the photogenerated charge transfer pathways related to heterojunctions and the catalytic mechanism were proposed and analyzed.
表面活性剂对催化剂形貌的修饰被认为是提高光催化性能的有效方法。在本工作中，通过在CdCO的立方晶体结构中生长CdS纳米颗粒获得了可见光驱动的复合光催化剂，经表面活性剂修饰后，形成了CdCO椭球体。这种合理的复合结构修饰设计有效地增加了比表面积，充分暴露了催化活性位点。CdCO中的Cd可进入CdS晶体结构产生晶格畸变并形成空穴陷阱，有效促进了CdS光生电子-空穴对的分离和转移。制备的5-CdS/CdCO@SDS表现出优异的Cr(VI)光催化活性，30 min内还原效率达86.9%，还原速率为0.0675 min，分别是CdS和CdCO的15.57倍和14.46倍。最后，提出并分析了还原过程中的主要活性物质、与异质结相关的光生电荷转移途径及催化机理。
