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      저자 : Hojat Samareh Delarami (검색결과 1 건)
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        A porous multifunctional and magnetic layered graphene oxide/3D mesoporous MOF nanocomposite for rapid adsorption of uranium(VI) from aqueous solutions

        Asma Amini,Mostafa Khajeh,Ali Reza Oveisi,Saba Daliran,Mansour Ghaffari-Moghaddam,Hojat Samareh Delarami 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.93 No.-

        A novel adsorbent, GO/Fe3O4/OPO3H2/PCN-222, was successfully synthesized via graphene oxide (GO)modification with magnetic particles, phosphorous-containing groups, and a mesoporous Zr-MOF, PCN-222 (PCN stands for Porous Coordination Network), respectively, to give the nominal composite. The laststep was through a solvent-assisted ligand incorporation technique. Morphological, structural, andphysicochemical properties of the hybrid material was assessed by FT-IR, PXRD, SEM/EDX, BET surfacearea, VSM, TGA/DSC, UV–vis DRS, and ICP-OES analyses. This solid was then used for dispersive solidphase extraction of uranium ions dissolved in water. Several parameters including pH of solution,extraction and desorption times, amount of adsorbent, and type and concentration of elution solventwere investigated and optimized. The maximum adsorption capacity of adsorbent was found to be416.7 mg g 1 (pH, 6.2; amount of adsorbent, 5.0 mg; extraction time, 3.0 min) beyond what wasachievable with the individual components. In addition, various coordination modes between themultifunctional adsorbent and uranyl ions were investigated by DFT calculations in details, revealingsome favorable non-covalent cation–p interaction and strong binding of free-base porphyrin, carboxyland phosphorous-containing groups to the uranium ions. Under optimized conditions, highdetermination coefficient (R2 = 0.9994) was obtained and limit of detection and relative standarddeviation were found 0.9 mg L 1 and 2.7%, respectively

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