1. Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University , Changchun 130118, China; 

 To achieve efficient removal of antibiotics and heavy metals in aquatic environments, a magnetic biochar?based bismuth tungstate photocatalyst (BC@ ZFO/ BWO) integrating efficient adsorption, visible?light pho? tocatalytic activity, and magnetic recyclability has been prepared by using a hydrothermal method in this study. The experimental results showed that when the mass fraction of magnetic biochar (BC@ ZFO) doping was 25% , the ad? sorption performance and photocatalytic activity of BC@ ZFO/ BWO were optimal. Within 120 minutes, the adsorp? tion rate of 20?? 00 mg / L tetracycline (TC) was 58.38% . Within 60 minutes of light reaction, the removal rates of 20?? 00 mg / L TC and Cr (Ⅵ) were 95.36% and 98.04% , respectively. ESR test results indicated that ·O - 2 and ·OH played a dominant role in the photocatalytic degradation process. Repeated usage experiments demonstrated that 25% mass fraction (BC@ ZFO) / BWO possessed good stability and magnetic recyclability. It can be seen that compared with the traditional bismuth tungstate photocatalysts, the construction of BC@ ZFO/ BWO photocatalytic composite material enhanced the redox capability of photocatalysts for organic pollutants and heavy metals in water, providing new insights for water pollution remediation and the recovery of powder catalysts.