[Preparation of Silicon-based Magnetic Biochar and Its Remediation Mechanism for Cd（Ⅱ） and As（Ⅲ） Co-contaminated Water].

Cadmium （Cd） and arsenic （As） often coexist in water and agricultural soils around mining areas, and it is difficult to remove them at the same time due to their opposite chemical behaviors. Therefore, this study employed a co-precipitation-pyrolysis method to synthesize silica-based magnetic biochar （SMB） materials for the remediation of water contaminated with both Cd and As. The optimization of preparation conditions involved introducing three different types of silicates （Na