College of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong, 643000, PR China.
College of Chemistry and Environmental Engineering, Sichuan University of Science and Engineering, Zigong, 643000, PR China.
Environ Res. 2022 Dec;215(Pt 2):114366. doi: 10.1016/j.envres.2022.114366. Epub 2022 Sep 20.
Low activity of photocatalysts is a serious bottleneck to the practical application of photocatalytic technology. In this paper, a series of BiOCl composite photocatalysts containing carbon quantum dots (CQDs) were successfully prepared by adding Panax notoginseng powder (PNP) to the solvothermal synthesis system of BiOCl as a template agent and a raw material for 0D CQDs. CQDs/BiOCl exhibit 2D flake structures and 3D flower-like microspheres self-assembled from thin flakes, holding rich oxygen vacancies (OVs). After detailed characterization, it was found that the amount of OVs on BiOCl could be regulated according to the amount of PNP added. The CQDs/OVs-BiOCl photocatalysts exhibit higher photogenerated charge separation efficiency and photocatalytic activity than the bare BiOCl. When the mass ratio of PNP/BiOCl is 1.0%, the photocatalyst demonstrates the maximum degradation activity for rhodamine B (RhB) and perfluorooctanoic acid (PFOA). In view of the solid observations, a photocatalytic enhancement mechanism of CQDs/BiOCl was elucidated.
光催化剂活性低是限制光催化技术实际应用的一个严重瓶颈。本文通过在 BiOCl 的溶剂热合成体系中添加三七粉作为模板剂和 0D CQDs 的原料，成功制备了一系列含碳量子点（CQDs）的 BiOCl 复合光催化剂。CQDs/BiOCl 呈现出 2D 片状结构和由薄片自组装的 3D 花状微球，具有丰富的氧空位（OVs）。经过详细的表征，发现 BiOCl 上 OVs 的数量可以根据添加的 PNP 量进行调节。与纯 BiOCl 相比，CQDs/OVs-BiOCl 光催化剂表现出更高的光生电荷分离效率和光催化活性。当 PNP/BiOCl 的质量比为 1.0%时，光催化剂对罗丹明 B（RhB）和全氟辛酸（PFOA）的降解活性最高。鉴于这一固态观察结果，阐明了 CQDs/BiOCl 的光催化增强机制。
