Adsorptive Elimination of Cu(II) from Aqueous Solution by Chitosan-nanoSiO2 Nanocomposite—Adsorption Study, MLR, and GA Modeling
2021
Bhattacharya, Samanwita | Bar, Nirjhar | Rajbansi, Baisali | Das, Sudip Kumar
At present, water pollution becomes a very significant environmental issue. Heavy metals and organic dyes present at higher concentrations in water are dangerous for aquatic life and humanity. Chitosan nanocomposites have been used for the adsorptive removal of heavy metals and dyes due to their improved chemical activity. This paper encompassed the synthesis of chitosan-nSiO₂ nanocomposites and was used to examine Cu(II) ion removal capability. The chitosan/nSiO₂ nanocomposite (CSNC) adsorbents were synthesized with different weight ratios. The nanocomposites are characterized by using SEM, EDX, BET apparatus, FTIR, XRD, and TGA. The experiment is performed in batch mode by varying the operating parameters like pH, contact time, temperature, adsorbent dosage, and initial metal ion concentration. The optimum pH is 6.5 for all adsorbents. Different kinetic and isotherm models are tried. The removal efficiency was greater than 98% for the adsorbent CSNC2–1. The pseudo-2nd-order model described the kinetic process better than other models. Equilibrium data fit the best in Fritz and Schluender (IV) isotherm model for the adsorbents CWS and CSNC2–1 and Vieth and Sladek isotherm model CSNC1–1. The adsorption process was spontaneous and endothermic. Industrial effluent is also tested successfully. The application of statistical and GA modeling has also been performed successfully.
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