Wang Hui, Zhang Chenyu, Kong Lingru, Wang Yi, Zhang Sijia, Zhang Xiulian, Ding Jie, Ren Nanqi
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Heilongjiang Provincial Key Laboratory of Polar Environment and Ecosystem, Harbin Institute of Technology, Harbin 150090, China.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
J Hazard Mater. 2022 Apr 5;427:128105. doi: 10.1016/j.jhazmat.2021.128105. Epub 2021 Dec 29.
A novel porous core-shell magnetic β-cyclodextrin/graphitic carbon nitride photocatalyst (Mβ-CD/GCN) was synthesized and employed in a solar light driven catalytic system for the degradation of polychlorinated biphenyls (PCBs). The Mβ-CD/GCN display superior photocatalytic performance on account of porous structure and ultrathin GCN nanosheets design, the former improves the utilization of visible light by multiple scattering and reflection of incident light, and the latter accelerates electron transfer. The ultrahigh specific surface area (1255 m g) of Mβ-CD/GCN provided a large number of active sites for adsorption and degradation of the target pollution. The pseudo-first order reaction rate constant (k) for the degradation of PCB180 by Mβ-CD/GCN was 0.021 min, which improved 3.23 times than the bulk GCN. Additionally, the effects of various reaction parameters and water matrices were studied on the degradation of PCB180. Three possible degradation pathways and mechanism of PCB180 were speculated according to the identification of reaction intermediates and detection of reactive species. The solar light driven Mβ-CD/GCN catalytic technology is a promising method not only for the control of persistent organic pollutants (POPs), but also the catalyst could be recovered and reused through simple magnetic separation.
合成了一种新型的多孔核壳磁性β-环糊精/石墨相氮化碳光催化剂（Mβ-CD/GCN），并将其应用于太阳光驱动的催化体系中，用于降解多氯联苯（PCBs）。Mβ-CD/GCN由于其多孔结构和超薄的GCN纳米片设计而表现出优异的光催化性能，前者通过入射光的多次散射和反射提高了可见光的利用率，后者加速了电子转移。Mβ-CD/GCN超高的比表面积（1255 m²/g）为目标污染物的吸附和降解提供了大量的活性位点。Mβ-CD/GCN降解PCB180的准一级反应速率常数（k）为0.021 min⁻¹，比块状GCN提高了3.23倍。此外，研究了各种反应参数和水基质对PCB180降解的影响。根据反应中间体的鉴定和活性物种的检测，推测了PCB180的三种可能降解途径和机理。太阳光驱动的Mβ-CD/GCN催化技术不仅是控制持久性有机污染物（POPs）的一种有前途的方法，而且该催化剂可以通过简单的磁分离回收和再利用。
