Abstract
This reported work aims to fabricate an eco-friendly Zr bio-based MOF and assessment its adsorption efficiency towards the cationic and anionic dye pollutants including methylene blue (MB) and direct red 81 (DR-81), respectively. Also, its adsorption tendency for the highly toxic heavy metal of hexavalent chromium (Cr(VI)) was compared with dyes. The adsorption performance of bio-MOF showed that the maximum monolayer adsorption capacities were recorded as 79.799 mg/g for MB, 36.071 mg/g for DR-81, and 19.012 mg/g for Cr(VI). Meanwhile, the optimum dosage of as-synthesized MIP-202 bio-MOF was 0.5, 1, and 2 g L−1 for MB, DR-81, and Cr(VI), respectively. Thermodynamic analysis demonstrated the spontaneous, thermodynamically, and endothermic nature of the decontamination processes onto the fabricated Zr bio-based MOF. The adsorption data were fitted by Langmuir isotherm model compared with Freundlich and Temkin models for all studied water pollutants. Pseudo-second-order kinetic model was a fit model for description of the adsorption kinetics of the different cationic and anionic pollutants onto Zr bio-based MOF. These outcomes indicated that Zr bio-based MOF has potential application for adsorption of different types of industrial water pollutants including cationic and anionic dyes and heavy metals.
Highlights
Metal–organic frameworks (MOFs), a large class of crystalline and porous hybrid materials, are constructed by linking metal containing units [Secondary Building Units (SBUs)] with organic linkers, using strong bonds[1]
To date, most the vast majority of Zr-MOFs used in water purification are constructed of organic ligands derived from petrochemical sources which are not bio-derived such as 2-amino terephthalic acid, biphenyl-4,4-dicarboxylic acid and trimesic acid in UiO-66-NH218, MOF-6719, and MOF-80820, respectively
We report for the first time the comparable excellent adsorption performance of a biocompatible Zr-MOF (MIP-202) constructed of aspartic acid as an organic bio-ligand and non-toxic metal ions (Zr(IV)) toward methylene blue (MB), direct red 81 (DR-81), and Cr(VI) decontamination from polluted water with high reusability and a very low cost compared to other MOFs
Summary
Metal–organic frameworks (MOFs), a large class of crystalline and porous hybrid materials, are constructed by linking metal containing units [Secondary Building Units (SBUs)] with organic linkers, using strong bonds (reticular synthesis)[1]. Production is desperately needed for a more clean ecosystem and a sustainable future this is still a challenging target at water treatment s ector[15] In this context, Zr-based MOFs are promising materials for water treatment because of their high porosity that facilitates adsorption and contributes to rapid pollutants r emoval[11], including decontamination of chromium from water[16]. Most of Zr-MOFs used in water treatment processes are prepared using toxic organic solvents such as DMF11, or acid modulators such as acetic acid or formic a cid[21] These MOFs are considered risky and not environmentally benign[22] and they hinder many important applications requiring eco-friendly materials, such as applications in the biomedicine, food industry and safe water purification[23]. We report for the first time the comparable excellent adsorption performance of a biocompatible Zr-MOF (MIP-202) constructed of aspartic acid as an organic bio-ligand and non-toxic metal ions (Zr(IV)) toward MB, DR-81, and Cr(VI) decontamination from polluted water with high reusability and a very low cost compared to other MOFs
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