Abstract
In this study, ternary magnetic materials (Dt@CaFe2O4@Fe3O4(Dt@CF@F)) were prepared via sintering method for selenite removal from aqueous solution, and under the optimized conditions, the maximum adsorption capacity of selenite reached 116.14 mg g−1. Based on the analysis of SEM, BET, XRD, XPS and FTIR, a proposed adsorption mechanism of Se(Ⅳ) by Dt@CF@F included inner layer complexation, electrostatic adsorption, and reduction reactions. Experimental results of adsorption isotherms revealed that the adsorption was chemisorption and monolayer adsorption. And results of thermodynamics indicated that Se (IV) adsorption was a spontaneously endothermic process. The results of coexisting ions experiment showed that the existence of Na+, K+, Mg2+, Ca2+ and coexisting anions such as Cl- and NO3- had insignificant effects on Se (IV) adsorption, whereas SO42− and PO43− exhibited a significant effect. The results of VSM analysis exhibited that Dt@CF@F has strong magnetic responsiveness, which is favorable for its efficient and facile magnetic separation. Furthermore, the adsorbent remained a high activity after 10 consecutive regeneration cycles, with the removal rate of Se (IV) decreased from 99.18% to 84.64%. Therefore, the synthesized Dt@CF@F adsorbent with high adsorption capacity, convenient magnetic separation, environmental friendliness, excellent stability and reusability has a great potential for the application of Se (IV) removal from aqueous solution.
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