Abstract
Ion exchange adsorption has demonstrated great promise for the removal of toxic ion contaminants from wastewater. Here, by combining in situ polymerization and quaternization, we successfully fabricated a series of poly(ionic liquids)/aluminum-based metal-organic framework composites, DUT-5-(X)I. The optimized DUT-5-(60)I possesses relatively large surface area and abundant exchangeable free iodide ions, which endow this composite with highly efficient adsorption of anionic pollutants. Specifically, over 90% of permanganate, methyl blue and methyl orange can be removed within 10 min. In addition, effects of pH and coexisting ions on the removal of adsorbates were examined. Pseudo-second-order kinetics and Langmuir isotherm model can well describe the adsorption results. The Langmuir isotherm model based maximum adsorption capacities of DUT-5-(60)I for permanganate, methyl blue, and methyl orange reached up to 1132, 1548, and 1474 mg/g, respectively. Adsorption mechanism studies suggest that the removal of these adsorbates was mainly controlled by electrostatic adsorption. This study will provide new insights for the development of MOF-based materials for environmental remediation.
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