| Scholar Name | Sandip Bhatt |
| Department | Science and Humanities |
| Reseach Area | Material Chemistry |
| Supervisor Name | Dr K R Gurjar |
| Title | Design of advanced functional material for fluoride andheavy metal ions removal from groundwater and wastewater |
| Abstract | This study presents a comprehensive investigation into the development and application of chemically modified chitosan-based adsorbents for environmental remediation and other possible applications. The present work integrates the development of novel chitosan-based hybrid adsorbents for fluoride and heavy metal remediation from aqueous media, with a special focus on chemically modified chitosan zirconium complex. In the first part, zirconium-ethylene diamine-chitosan Complex (Zr@Ch-EDA) was synthesized via microwave- assisted and traditional chemical transformation routes. The material demonstrated high fluoride adsorption efficiency, governed by pseudo-second-order kinetics and best described by the Freundlich and Temkin isotherm models, indicating multilayer adsorption and physisorption mechanisms. Zirconium tetrachloride and diethyl oxalate were employed in the present work to synthesized Zr@CSA (Zirconium oxalic acid chitosan Complex). Fluoride ion uptake capacities were studied in aqueous medium using the batch method with zirconium and oxalic acid chitosan complex. This adsorbent shows maximum defluoridation capacities of 96%. The nature of fluoride adsorption was explored by applying Langmuir, Freundlich, Dubinin?Radushkevich, and Temkin isotherms and kinetic models of adsorption. Utilising sophisticated instrumental techniques, such as Fourier transform infrared spectroscopy (FTIR), Powder X-ray diffraction (XRD), Thermogravimetric and BET analysis, the structural, surface, crystalline nature, thermal and bonding properties of Zr@CSA were examined. The chemically modified Chitosan (Zr@CSA) has the potential to be an effective adsorbent for treating water and wastewater defluorination, based on all of the data. In the second part, a series of chitosan derivatives synthesized via amino-group protection/deprotection exhibited potent antimicrobial properties and remarkable selectivity for Ni?? over Cu??, especially in thiol-modified variants. Among these, the thiol-modified Chitosan showed good adsorption c |