Phosphate Removal by Ca-Modified Magnetic Sludge Biochar Prepared by a One-Step Hydrothermal Method

The problem of phosphorus pollution and its resource utilization has been a source general concern. preparation green, renewable, non-secondary adsorbents become research direction. In this paper, one-step hydrothermal method Ca-modified magnetic sludge biochar (Ca-MSBC) is used for enhancing phosphate removal. results show that the adsorption rate by Ca-MSBC mainly controlled chemisorption but also related to physical an internal diffusion mechanism. maximum capacity was 89.25 mg g−1 at 343 K (initial concentration 500 L−1). After nine cycles experiments, 70.16 still high. addition, coexisting ions Cl−, NO3−, SO42−, CO32− have no significant effect on properties phosphate. XRD, FT-IR, VSM, XPS, N2 adsorption/desorption isotherms showed mechanism removal from water chemical precipitation reaction calcium. study indicate potential application environmental value as solid waste recycling material remediation.