Modified Chitosan Immobilized on Modified Sand for Industrial Wastewater Treatment in Multicomponent Sorption: Shrimp Biowaste Processing

Abstract

In this paper, modified chitosan immobilized on modified sand (MCs/MS) was synthesized and characterized by infrared spectroscopy (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and energy dispersive X-ray analysis (EDXA). MCs/MS composite was used to remove Reactive Red 23 (RR23), Reactive Blue 19 (RB19) and Iron III (Fe³⁺) in three single-component and three binary, RR23+RB19, RR23+Fe³⁺ and RB19+Fe³⁺. Batch experiments were carried out for adsorption kinetics, isotherms and thermodynamics. Operational parameters studied were pH, contact time, temperature, adsorbate and adsorbent concentrations. Adsorption kinetics in single and binary systems of components followed pseudo- second-order kinetics model. The isotherm data in single and binary systems followed Freundlich isotherm model. Thermodynamic parameters have disclosed that the adsorption is exothermic and not spontaneous with a physical adsorption for both single and binary systems. The results showed that MCs/MS composite was an effective adsorbent to remove hazardous pollutants with a removal rate between 80% and 99.6%, the optimal contact time was between 120 and 180 min for all components in single and multicomponent system.

Keywords : Modified chitosan immobilized on modified sand, Multicomponent system, Reactive Red 23, Reactive Blue 19, Iron III, Hydrothermo-Chemical method.