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Removal of Hg2+ heavy metal ion using a highly stable metal-organic framework
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1  Iran University of Science & Technology


The zirconium-based metal-organic framework with 5,10,15,20-tetrakis(4-carboxyphenyl)porphyrin (H2TCPP) linker known as PCN-221 was successfully synthesized by the solvothermal method. Characterization of the MOF was performed using various techniques, such as FT-IR, XRD, UV-Vis, and SEM analysis. The MOF has then applied to rapidly and efficiently adsorption of mercury (Hg2+) ions using an ultrasonic bath. Different parameters such as initial metal ion concentration, contact time, solution pH and adsorbent dose were investigated. The presence of a nitrogen-functionalized group in the porphyrin ligand in PCN-221 structure contributed to the absorption of mercury ions. The adsorption capacity of 233 mg g-1 was obtained for this adsorbent in less than 30 minutes at pH = 7. The experimental adsorption data for the PCN-221 MOF are well suited with the pseudo-second-order kinetic model (R2 = 0.99), and adsorption isotherms of Pb2+ metal ions are in good agreement with the Langmuir model.

Keywords: Metal-organic frameworks; Hg2+; Heavy metal ions; Removal; Adsorption