Defect engineering is considered an effective means to improve the photocatalytic performance of semiconductors. However, current research on defects mainly focuses on single atom vacancies, lacking research on atomic vacancy pairs. In this work, we used SnS 2 as the research model and constructed SnS 2 nanostructures with rich S vacancies and dual S vacancy pairs, respectively. By comparing the photocatalytic activation O 2 performance of SnS 2 under different defect effects, it was found that dual S vacancy pairs have better performance optimization characteristics than S vacancies. Combining experiments and theoretical calculations, it is confirmed that dual S vacancy pairs have significant advantages over S vacancies in regulating the band structure, improving the separation efficiency of photogenerated charges and the migration rate of charge carriers, as well as activating the interface reaction of O 2 . In addition, when the catalyst is used for the removal of organic matter in water, it can be found that the optimization effect of dual defects on performance has good sustainability. This work contributes to a deeper understanding of the application scope of defect engineering and provides new ideas for the development of highly active photocatalysts.
Bo Yang,Wenjing Wang,Zhenzhong Hu,Boxiong Shen,Sheng-Qi Guo
Developing new photocatalysts to achieve efficient removal of phthalate esters (PAEs) in water is an important research task in environmental science. However, existing modification strategies for photocatalysts often focus on enhancing the efficiency of material photogenerated charge separation, neglecting the degradation characteristics of PAEs. In this work, we proposed an effective strategy for the photodegradation process of PAEs: introducing vacancy pair defects. We developed a BiOBr photocatalyst containing “Bi-Br” vacancy pairs, and confirmed that it has an excellent photocatalytic activity in removing phthalate esters (PAEs). Through a combination of experimental and theoretical calculations, it is proved that “Bi-Br” vacancy pairs can not only improve the charge separation efficiency, but also alter the adsorption configuration of O 2 , thus accelerating the formation and transformation of reactive oxygen species . Moreover, “Bi-Br” vacancy pairs can effectively improve the adsorption and activation of PAEs on the surface of samples, surpassing the effect of O vacancies. This work enriches the design concept of constructing highly active photocatalysts based on defect engineering, and provides a new idea for the treatment of PAEs in water.
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