“Synthesis and characterization of Chitosan-Tamarind Gum-CaO nanoparticle hydrogels for improved adsorption of Alizarin Red-S Dye from aqueous solution: performance assessment and mechanistic insights”
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Abstract
This research investigates the development of highly efficient adsorbents for removal of Alizarin Red-S (ARS) dye from aqueous solutions using chemical crosslinking of chitosan (CH), tamarind gum (TG), and calcium oxide nanoparticles (CaO NPs). Various analytical techniques, including TGA, XRD, SEM, and FTIR, were employed to examine the interactions and morphological changes in the hydrogels. The adsorption capacity of CH-TG and CH-TG-CaO hydrogels was evaluated under different conditions, including adsorbent amount, contact time, pH, and temperature. The data fit well with the Langmuir model, with maximum adsorption capacities (qmax) of 79.05 mg/g for CH-TG and 87.33 mg/g for CH-TG-CaO. A significant increase of approximately 9.38% in ARS adsorption was observed with CH-TG-CaO compared to CH-TG. Optimum adsorption was achieved at pH 7, with 360 min for CH-TG and 160 min for CH-TG-CaO. The highest removal efficiencies were 87.17% for CH-TG and 96.55% for CH-TG-CaO at an adsorbent amount of 0.25 g and 40 mg/L dye concentration at 30 °C and pH 7. The adsorption process followed the pseudo-second-order kinetic model, and thermodynamic results suggest the process is physical, exothermic, and spontaneous. The presence of -NH2 groups in the hydrogels enhanced affinity for anionic dyes through hydrogen bonding and electrostatic interactions. Thus, CH-TG and CH-TG-CaO hydrogels are promising and efficient adsorbents for environmental remediation.
期刊介绍：
The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.
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