SEM images confirmed that ZIF-8 is physically embedded in Iota-Carrageenan, forming a honeycomb structure. We have transformed the ZIF-8 powder into a moldable, load-bearable, flexible, and eco-friendly aerogel. The MOF used herein is 2-methylimidazole zinc complex (ZIF-8), whereas the biopolymer is the nontoxic and biodegradable Iota-Carrageenan (iCG), a sulfated polysaccharide extracted from red seaweeds. Here, we report a MOF/biopolymer composite-based aerogel that is a cost-effective, highly efficient, and environmentally sustainable material for the removal of large concentrations of heavy metal ions (1277 mg of Pb 2+, 466 mg of Cd 2+, and 706 mg of Cr 6+ per gram of the aerogel) and the selective removal of the cationic dye crystal violet (310 mg/g) from its mixture with (anionic) methyl orange from contaminated water samples. Metal–organic framework (MOF)-based materials with their excellent adsorption performance are recently explored as an alternative method to the traditional methods. Ameliorating the existing purification methods with more affordable, efficient, and industrially adoptable methods that remove heavy metal ions from contaminated drinking water constitutes a persistent technological challenge.
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