In the present work, native chitosan (Ch) along with its chemically and physico-chemically modified versions namely sulphate cross-linked chitosan (SCC) and sulphate cross-linked chitosan-bentonite composite (SCC-B) were employed as potential adsorbents for the removal of an anionic dye, Alizarin red S (ARS) from aqueous solutions. All the three adsorbents were extensively characterized using techniques such as FT-IR, SEM, EDX, XRD, BET, TGA-DTA and pHPZC. Various parameters were optimized including pH of dye solution, contact time, adsorbent dose, initial adsorbate concentration and temperature of adsorption. Four adsorption isotherm models were studied and it was found that Freundlich model was best-fit for all the three systems. Maximum adsorption capacities towards adsorption of ARS were found to be 42.48, 109.12 and 131.58 mg g−1 for chitosan, SCC and SCC-B respectively. Kinetics of adsorption was thoroughly examined by employing three well-known models in order to deduce the mechanism of adsorption. Thermodynamic studies show that the process is spontaneous and exothermic for all adsorbents employed. Further, it was observed that for large sample volumes, column adsorption method was more effective as compared to batch method.
A highly efficient mesoporous bimetallic cellulose composite has been prepared by simultaneous precipitation of Fe and Al metal solutions in cellulose matrix. This Fe-Al doped cellulose (FADC) was characterized using...
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.