SYNTHESIS AND CHARACTERIZATION OF NICKEL-SUCCINIC ACID METAL- ORGANIC FRAMEWORK FOR REMOVAL OF HEAVY METALS FROM WASTEWATER

<strong>Abstract</strong>: The very abundance of toxic heavy metals in wastewater due to the industrial expansion poses severe health risks for humans, and also for other life forms through bioaccumulation along food chains. . Industrial development has caused the release of various pollutants including heavy metals such as Cd, Pb and Cr in to the environment. In the present work, a crystalline nickel-succinic acid metal organic framework material was synthesized using a solvothermal method and the adsorption capacity and adsorption efficiency of the synthesized material were investigated by using iodine number analysis, XRD and FTIR techniques. Wastewater samples were collected from Gofa zone of Sawla town from a car wash stations. The analyses of selected heavy metal ions such as Pb2+, Cd2+, and Cr3+concentrations were carried out by using Flame Atomic Absorption Spectroscopy (FAAS).The removal efficiency of heavy metals by Ni-MOF was tested by optimizing the adsorption parameters such as adsorbent dosage, pH, initial metals concentration and adsorption time. The optimum pH is 6 for Cd2+ and Pb2+,2 for Cr3+, adsorbent dosage is 2.5 g for Cr3+ and Cd2+ ,1.5 g for Pb2+ and the equilibrium adsorption time is 60 minute for Pb2+, 80 minute for Cd2+ and Cr3+. The heavy metals concentration in wastewater before treated with synthesized Ni-MOF was determined as 0.04, 0.04, 0.01 mg/L for Pb(II), Cd(II) and Cr(II) respectively. After treated with synthesized Ni-MOF the concentration of Pb2+,Cd2+ and Cr3+ reduced to 0.003, 0.0023 and 0.0013 mg/L respectively. The removal efficiency recorded as 92.5 %, 94.25 % and 87 % for the respective metal ions. The removal of Pb2+, Cd2+ and Cr3+ ions from wastewater sample were varied with contact time, adsorbent dosage, pH and initial metal concentration.