Reducing the recombination efficiency of photo-induced carriers has been found as an effective means to improve the degradation of
antiviral agents. Given that the Lorentz forces can cause the abnormal charge to move in the opposite direction, external magnetic field improved α-Fe2O3/Zn1-xFexO heterojunctions (FZHx) were developed to remove increasing
antiviral agents that were attributed to the
COVID-19 pandemic under visible light. The characterization of the mentioned FZHx in the external magnetic field indicated that FZHx had perfect photocatalytic activity for degrading
antiviral agents. In the external magnetic field, the quantities of photo-generated carriers and
free radicals (•OH and •O2 -) derived from FZHx increased significantly, which improved
antiviral agent removal by 30.0%. Though the band structure (α-Fe2O3) is unlikely to change due to some orders of magnitude weaker of Zeeman energy in magnetic fields, which insignificantly impacts photocatalytic performance. However, this study proposed a strategy of negative magnetoresistance effects and heterojunctions to facilitate the separation and transfer of photo-induced carriers in magnetic fields. Based on the proposed strategy, spin oriented electrons were selected and accumulated on the conduction band, which contributed to the degradation of
antiviral agents. Overall, this study presented novel insights into the improved degradation performance of
antiviral agents by applying Fe-based heterojunctions in an external magnetic field.