Liu Meng, Ning Yuting, Ren Meng, Fu Xinping, Cui Xuedan, Hou Daibing, Wang Zihan, Cui Jun, Lin Aijun
College of Chemical Engineering, Beijing University of Chemical Technology, Beijing, 100029, P. R. China.
Small. 2023 Nov;19(46):e2303876. doi: 10.1002/smll.202303876. Epub 2023 Jul 19.
Inadequate photo-generated charge separation, migration, and utilization efficiency limit the photocatalytic efficiency. Herein, a MoS /MIL-53(Fe) photocatalyst/activator with the S-scheme heterojunction structure is designed and the charge migration behavior is modulated by the internal electric field (IEF). The IEF intensity is enhanced to 40 mV by modulating band bending potential and the depletion layer length of MoS . The photo-generated electron migration process is boosted by constructing the electron migration bridge (Fe-O-S) and modulating the IEF as the driving force, confirmed by the density functional theory calculation. Compared with the pristine materials, the photocurrent density of MoS /MIL-53(Fe) is significantly enhanced 27.5 times. Contributed by the visible-light-driven cooperative catalytic degradation and the high-efficiency direct photo-generated electron reduction dichlorination process, satisfactory chlorinated antibiotics removal and detoxification performances are achieved. This study opens up new insights into the application of heterojunctions in photocatalytic activation of PDS in environmental remediation.
光生电荷分离、迁移和利用效率不足限制了光催化效率。在此，设计了一种具有S型异质结结构的MoS₂/MIL-53(Fe)光催化剂/活化剂，并通过内建电场（IEF）调节电荷迁移行为。通过调节能带弯曲电位和MoS₂的耗尽层长度，IEF强度提高到40 mV。通过构建电子迁移桥（Fe-O-S）并将IEF作为驱动力进行调节，促进了光生电子迁移过程，这一点得到了密度泛函理论计算的证实。与原始材料相比，MoS₂/MIL-53(Fe)的光电流密度显著提高了27.5倍。得益于可见光驱动的协同催化降解和高效的直接光生电子还原二氯化过程，实现了令人满意的氯代抗生素去除和解毒性能。该研究为异质结在环境修复中光催化活化过二硫酸盐的应用开辟了新的见解。
