Application of MIL-53(Fe)in Remediation of Sb(Ⅲ)-Contaminated Soil
MIL-53(Fe),a metal-organic framework(MOF)material,prepared by using solvothermal synthesis was adopted to adsorb Sb(Ⅲ)in soil.MIL-53(Fe)was used as the adsorbent to adsorb the Sb(Ⅲ)in aqueous solution,and the effects of solution temperature,pH value,adsorbent dosage,initial concentration of Sb(Ⅲ),and humic acid content on adsorption performance were explored.Then,the isotherms and kinetics of adsorption were also analyzed.After 15 d remediation with the adsorbent at an amount of 3%,the TCLP testing shows that the concentration of leachable Sb(Ⅲ)decreases by 94.2%.However,the pH value and humic acid content of the solution have little effect on the adsorption performance.For 25 mL solution with concentration of Sb(Ⅲ)at 10 μg/mL,addition of 20 mg MIL-53(Fe)can bring good adsorption effect.The initial concentration of Sb(Ⅲ)has a significant impact on the adsorption of Sb(Ⅲ)by MIL-53(Fe).At equilibrium,the maximum adsorption capacity of the adsorbent is 102.9 mg/g.The adsorption isotherm of this process fits with the Freundlich model,and its adsorption kinetics can be described using pseudo-second order model.
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