An Efficient Removal of Dimozol Red from Waste Water by Adsorption onto Chitosan/Marble Powder Composite: A Novel Low Cost Adsorbent

Abstract

In the present study, chitosan (C)/marble powder (M) composites with different weight ratio percentage (C100M0, C70M30, C50M50 and C30M70) were prepared with marble powder and chitosan and characterized by Scanning Electron Microscopy (SEM). The composites were used for the adsorption of Dimozol Red dye from aqueous solutions. The influence of contact time, pH, adsorbent dosage, initial dye concentration and temperature on Dimozol Red adsorption onto the composites was investigated. Equilibrium data were analyzed by model equations such as Langmuir and Freundlich isotherms and were best represented by Freundlich isotherm model. Kinetic adsorption data were analyzed using the pseudo-first-order kinetic model and the pseudo-second-order kinetic model. The adsorption kinetics well fitted with a pseudo-second-order kinetic model. Thermodynamic parameters, ΔG°, ΔH° and ΔS°, were calculated, indicating that the adsorption of Dimozol Red onto the composites was spontaneous and exothermic in nature.