Research on preparation of iron-based organic metal-organic framework at room temperature for adsorption of trivalent arsenic
Arsenic pollution of groundwater is becoming increasingly serious,and drinking high-arsenic groundwater will se-riously endanger human health.Therefore,it is of great significance to efficiently remove arsenic from water.The iron-based metal-organic framework MIL-88A was synthesized at room temperature for adsorbing As(Ⅲ)from water.MIL-88A was characterized by XRD,SEM,XPS and FT-IR.The kinetics and thermodynamics parameters of MIL-88A adsorbing As(Ⅲ)were studied.The experimental results showed that MIL-88A could efficiently adsorb As(Ⅲ)from water with the maximum adsorption capacity up to 286.37 mg/g,which was higher than that of similar adsorbents.The adsorption kinetic and iso-therm data of MIL-88A were corresponded to pseudo-second-order kinetics model and Freundlich model,respectively,indi-cating that the adsorption process of MIL-88A to As(Ⅲ)was a combination of chemical adsorption and multi-layer adsorp-tion.Combining with the characterization analysis,it was concluded that the carboxyl groups on the surface of MIL-88A could oxidatively adsorb As(Ⅲ)and oxidated to generate As(V),and As(V)adsorbed on the surface of the material could further adsorb As(Ⅲ)through hydrogen bonds,forming a multi-layer adsorption.This paper provided a theoretical reference for the efficient removal of As(Ⅲ)from water.
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