Abstract: In this study, two porphyrin-based metal-organic frameworks (MOF) containing Zn-TCPP and Co-TCPP (TCPP represents mes-tetrakis(4-carboxyphenyl) porphin) were synthesized via a simple bottom-up process. The microstructure and morphology of the prepared porphyrin-based MOF were characterized by scanning electron microscopy (SEM), Zeta analysis, infrared spectroscopy (FT-IR) and X-ray diffractometry (XRD). The effects of different pH, contact time, initial uranium concentration and temperature on the adsorption of U(Ⅵ) were investigated. The results of batch experiments showed that the maximum adsorption capacities of Zn-TCPP and Co-TCPP for U(Ⅵ) were 412.2 mg/g and 307.7 mg/g (298.15 K, pH=5.5), respectively. The adsorption process closely fitted the Langmuir isotherm, and pseudo-second-order kinetics models indicated that chemical and monolayer adsorption dominated the adsorption process of U(Ⅵ) onto both porphyrin-based MOF. It was found that both porphyrin-based MOF showed good recyclability and the adsorption capacity was still maintained above 80% after five adsorption-desorption cycles.
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