This thesis consists of three experimental parts. First: synthesis of cyclic carbonates from their related epoxides using silica-supported Ionic liquids. The optimum reaction conditions, the effect of chain length, and anion exchange were explored. The kinetic model and activation energy were also investigated. The theoretical part of the study was about the impact of catalyst interactions on the first transition state of the reaction. Second: the potential of intestine drug delivery of chitosan-tragacanth blends was studied. The low rate of release in the stomach and a reasonable one in the intestine was favorable. The blends properties such as morphology, swelling, and stability, as well as their toxicity, were explored, and kinetic models that display the mechanism of the release were also explained. Third: the ability to use thiol modified waste paper to recover gold ions from aqueous liquids was considered. The grafting of thiol groups was confirmed by elemental analysis and EDS. The textural properties of cellulose before and after Au adsorption were observed and the adsorption isotherms, kinetics, and mechanism were described thoroughly. The adsorbed gold particles could be recovered by incineration and also desorbed, which let the adsorbent to be reused several times.
