Abstract
A simple and economical precipitation process was used to in situ synthesize a heterojunction of BiOBr(110)/BiOCl(110). Numerous techniques, such as SEM, XRD, HRTEM, BET, FTIR, and XPS, verified the successful creation of the heterostructure. In particular, the heterostructures exhibited significantly enhanced photocatalytic degradation efficiency towards ceftazidime (CFZ). The degradation kinetic constant of CFZ by BiOBr(110)/BiOCl(110) (5:5) was three times higher than those of BiOBr and BiOCl. Additionally, a type I heterojunction was reasonably suggested following UV–vis DRS and VB-XPS investigations. DFT calculations indicated that an internal electric field (IEF) was created when electrons (e-) on the BiOBr surface were transferred to BiOCl in the dark. Upon visible light illuminated, photoinduced-e- was transferred from the conduction band (CB) of BiOCl to that of BiOBr under the action of IEF. In contrast, holes (h+) moved in the opposite direction, realizing the separation of e-/h+ pairs. Three degradation pathways were deduced based on intermediate products (IPs) detection by HPLC-MS. Importantly, the heterojunction catalyst exhibited efficient catalytic performance across solutions with different pH and maintained great reusability during four cycles of photodegradation. Overall, the work revealed distinctive insights concerning the mechanism of antibiotic degradation with BiOBr(110)/BiOCl(110) heterojunction structures.
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