Rationally designed ZnFe1.2Co0.8O4/BiVO4 S-scheme heterojunction with spin-polarization for the elimination of antibiotic
Jingbo Wu, Qijing Xie, Chengliang Zhang, Haifeng Shi
Abstract
Recently, the regulation of electronic spin polarization has attracted considerable interest as an effective strategy to mitigate the rapid recombination of photo-generated charges. However, current research predominantly targets individual photocatalysts , where the efficiency of charge separation still has significant room for improvement. Herein, a ZnFe 1.2 Co 0.8 O 4 (ZFCO) and BiVO 4 (BVO) S-scheme heterojunction was developed, which synergistically promoted charge separation through the S-scheme heterojunction and spin polarization , and further enhanced the photocatalytic performance in removing organic pollutants under an external magnetic field . Experimental results revealed that under sole light irradiation , ZB-1.5 (ZFCO : BVO = 3 : 2) demonstrated optimal performance, with a reaction rate constant ( k ) for tetracycline (TC) degradation of 0.0146 min −1 . Under light irradiation and magnetic field conditions, the reaction rate constant ( k ) of ZB-1.5 for TC degradation increased to 0.0175 min −1 , indicating enhanced photocatalytic performance. DFT calculations indicated that ZFCO exhibited the spin polarization . Photoluminescence measurements demonstrated that the S-scheme heterojunction structure improved the charge separation efficiency. In addition, possible degradation pathways and toxicity were assessed, indicating successful detoxification . This work provides some useful insights into utilizing S-scheme heterojunctions to develop photocatalysts with efficient separation of photo-generated charges.