Bifunctional gelatin/dextrin hybrid backbone based fluorescent chemo-sensor for the detection of tannic acid and removal of eosin yellow dye

Abstract

In this work, we developed a green strategy for the fabrication of bio-based gelatin/dextrin semi-interpenetrating network (Gel-dex-cl-polyAAm) and carbon quantum dots (CQDs) nanocomposite (CQDs/Gel-dex-cl-polyAAm) for the detection of tannic acid and removal of eosin yellow dye present in water sample. The synthesis of semi-interpenetrating network (semi-IPN) was done under hot air reaction conditions using acrylamide and N,N′-methylenbisacrylamide monomer-crosslinker system. The maximum swelling response of the synthesized semi-IPN was found to be 597% after optimizing all the process parameters. The nanocomposite was derived through in-situ incursion of carbon quantum dots inside the crosslinked matrix of semi-IPN and it was capable of detecting the presence of tannic acid, selectively in wastewater through fluorescence quenching analysis. Maximum quenching efficiency was observed to be 98%. The synthesized devices were also found to be an effective absorbent for the removal of eosin yellow dye from contaminated water. Maximum dye removal potential in case of nanocomposite was found to be 92%. Adsorption isotherm and kinetics studies indicated the applicability of flory huggin's adsorption isotherm along with 2nd order kinetics. The industrial applicability of the samples was depicted from regeneration and reusability experimental essay.