Experimental Research on the Preparation of Composite Adsorbent Based on Iron Manganese Mud to Remove Sb(III) from Water.

Antimony pollution and sewage sludge disposal have become global environmental protection issues. In this study, through the resource utilization of iron manganese mud (IMM) generated during the backwash of water supply plants, a new type of composite gel ball adsorbent for antimony removal (CAAR) was prepared. The characterization results demonstrated that CAAR's adsorption effect was mainly through ion exchange between -OH and Sb(III). The chemical adsorption of functional group exchange and the physical adsorption of electrostatic gravity were jointly controlled. The adsorption process could be described by the quasi-secondary kinetic model and the Freundlich model. Through the exploration of the influencing factors, we found that CAAR has a wide range of pH applications and can maintain a removal rate of over 92% in the range of pH 2.0 to 8.0. When the pH is 4.0, the dosage is 3.0 g/L, at 30 ℃ and 12 h, the removal rate of CAAR to Sb(III) is 95.95%, and the adsorption amount is 6.36 mg/g. The CAAR regeneration research experiments have shown that after four regenerations, the removal rate of Sb(III) could be maintained at more than 50%, and the mechanical strength of the regenerated CAAR is preferable. In summary, CAAR is an adsorbent for removing Sb(III) from water, which has broad application prospects and further research value. [ABSTRACT FROM AUTHOR]