A combined experimental and modeling approach to elucidate the adsorption mechanism for sustainable water treatment via In2S3-anchored chitosan
Soumya Ranjan Mishra, Prerona Roy, Vishal Gadore, Md. Ahmaruzzaman
Abstract
Abstract A novel Chitosan/Indium sulfide (CS/In 2 S 3 ) nanocomposite was created by co-precipitating Chitosan and InCl 3 in solution, resulting in In 2 S 3 agglomeration on the Chitosan matrix with a remarkable pore diameter of 170.384 Å, and characterized it for the physical and chemical properties. Under optimal conditions (pH = 7, time = 60 min, catalyst dosage = 0.24 g L −1 , and dye concentration = 100 mg L -1 ), the synthesized nanocomposite demonstrated remarkable adsorption capabilities for Victoria Blue (VB), attaining a removal efficiency of 90.81%. The Sips adsorption isotherm best matched the adsorption process, which followed pseudo-second-order kinetics. With a rate constant of 6.357 × 10 –3 g mg −1 min −1 , the highest adsorption capacity (q m ) was found to be 683.34 mg g −1 . Statistical physics modeling (SPM) of the adsorption process revealed multi-interaction and multi-molecular adsorption of VB on the CS/In 2 S 3 surface. The nanocomposite demonstrated improved stability and recyclability, indicating the possibility for low-cost, reusable wastewater dye removal adsorbents. These results have the potential to have practical applications in environmental remediation.