Abstract
A site-specific functionalized novel bio-adsorbent (seed composite; MOLL) was used for the remediation of toxic metal ions from the water bodies. The graft co-polymerization using acrylic acid has been carried out onto the polyvinyl alcohol encapsulated seed composite to enrich the bio-adsorbent surface with numerous active carboxylic functionalities responsible for the enhancement in the remediation of cationic metal ions from aqueous system. The morphology, surface area, porosity, presence of functionalities and thermal stability were characterized using SEM-EDX, BET, FTIR and TGA. The functionalized bio-adsorbent (AA-g-PVA-SC-en) exhibited excellent remediation of metals (Pb2+, Cd2+, Cr3+and Ni2+) in the range (90% − 98%) with adsorption capacity (22.44 – 24.73 mg/g). The adsorption capacities in both a single metal and multi-metal system far exceeds from other bio-adsorbents reported so far. The regeneration of functionalized bio-sorbent remained up to six cycles. The findings open up new avenues for the development of a green pre-treatment approach for water remediation, prior to the large scale chemical treatment.
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