A combined experimental and modeling approach to elucidate the adsorption mechanism for sustainable water treatment via In2S3-anchored chitosan

• Published in: Scientific reports 2023-10, Vol.13 (1), p.18051-18051, Article 18051
• Main Authors: Mishra, Soumya Ranjan, Roy, Prerona, Gadore, Vishal, Ahmaruzzaman, Md
• Format: Article
• Language: English
• Subjects: 639/925/357; 704/172/169/896; Adsorption; Catalysts; Chemical properties; Chitosan; Color removal; Dyes; Environmental cleanup; Humanities and Social Sciences; Mathematical models; multidisciplinary; Nanocomposites; Science; Science (multidisciplinary); Wastewater; Water treatment
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-023-45506-4

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.