Abstract
In this work, a low cost, in situ synthesized silver-chitosan (Ag-CH) nanocomposite hydrogel has been proposed for the detection and rapid removal of hexavalent chromium from water. Silver nanoparticles are enmeshed in a network of highly porous chitosan-based hydrogel matrix for the effective detection and removal hexavalent chromium. The in situ reduction of silver nitrate to silver nanoparticles within the chitosan blended polymer matrix ensures the high stability of AgNPs and the resulting Ag-CH nanocomposite acts as a colorimetric sensor for hexavalent chromium [Cr (VI)] with enhanced lower detection limit (LoD) of upto 0.1 ppb. Physico-chemical properties of the prepared Ag-CH nanocomposite hydrogel are studied using UV–Visible spectroscopy, FESEM and FTIR analysis. The Ag-CH nanocomposite shows high porosity and cross-linking, which makes it ideal as a biocompatible, low-cost and sustainable biosorbent material. The hydrogel has a high removal efficiency of 83 % for Cr (VI). The effortless regeneration of the nanocomposite hydrogel aids in its easy reusability. The biocompatibility, sustainability and reusability of the Ag-CH hydrogel confirms its effectiveness as a nanobiosorbent material and provides a potential solution for simultaneous sensing and remediation of heavy metal ions from aqueous matrices.
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