Abstract
Pb(II) is one of the toxic water contamination agents, therefore, finding an efficient way to remove it from wastewater has become a serious issue. Herein, a metal–organic framework (MOF), formulated as [Zn2(oba)2(bpfb)]·(DMF)5 (TMU-23), with amide-decorated pores, was prepared for Pb(II) removal. At first, various determining factors including pH and adsorbent dosage were optimized and MOF adsorption capacity was equal to 434.7 mg g−1. Moreover, the reusability and effect of competitive cations were studied. Adsorption–desorption tests showed that during three cycles, MOF works efficiently. Modeling calculations illustrate that pseudo-second-order and Langmuir models provide the best description for adsorption mode. Based on these models, monolayer adsorption behavior was responsible for the adsorption process through chemical interaction between the analyte and the walls of MOF. Additionally, the possible adsorption mechanism was confirmed by FTIR spectroscopy, EDS and SEM images. The significant affinity between amide groups of pillars and Pb(II) leads to good removal performance.
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