REMOVAL OF LEAD AND CADMIUM IONS FROM AQUEOUS MEDIUM BY MOF COMPOSITE (MIL-101-1,2-DICHLOROETHANE)

Abstract

Metal organic frameworks (MOFs), have got significant attention over other adsorbents in the last decade. This is basically due to porosity in structure which welcomes host molecules. Metal organic frameworks (MOFs), emerged like excellent porous materials which are now used as adsorbents due to large surface area, permanent porosity and bulk structure. MOFs can be synthesized by both organic and inorganic linkers and metal ion, which results to create extensive three dimensional frameworks. MOFs have some advantages over conventional adsorbents as greater adsorption capacity, large surface area, functional porosity, ordered structure and recyclability. Possible fields of application range from gas adsorption and storage, catalysis, molecular sieving and chemical sensors. In this research work adsorption of heavy metals (Lead and Cadmium) ions on MIL-101- 1,2-Dichloroethane composite is studied, for this MIL-101 is synthesized. X-Ray diffraction technique and FT-IR were used to confirm crystalline structure of MIL- Adsorption capability was enhanced by making MIL-101-1,2-Dichloroethane composite. In order to conduct adsorption experiments, solutions of different concentrations of salts of Lead acetate and Cadmium chloride were prepared and these metals ions were adsorbed on MIL-101-1,2-Dichloroethane composite. Adsorption of heavy metals (Lead and Cadmium) ions on MIL-101- 1,2-Dichloroethane composite were studied by X-Ray diffraction technique and ICP. Langmuir and Freundlich models reveal the adsorption of metals, and these models show that MIL-101-1,2-Dichloroethane composite has good adsorption capacity. Langmuir and Freundlich model effectively explains adsorption of heavy metals The concentration of Lead ions was 557 mg/g and the concentration of Cadmium ions was 608 mg/g adsorbed on the surface of 1, 2-Dicholoroethane-MIL-101 composite.