Enhanced Remediation of Reactive Black 5 from Aqueous Media Using New Chitosan Ion Exchangers

Abstract

Chitosan was cross-linked using epichlorohydrine to form chitosan gel. The resins obtained were chemically modified through the reaction with to 1,1,1,3,3,3 hexafloro,2-bis (3-amino,2-hydroxyphenyl) propane to produce resin (RI), 3-amino-1,2,4 triazole,5-thiol to produce resin (RII), and melamine to produce resin (RIII). The uptake of Reactive Black 5 (RB5) from aqueous media by the obtained resins was studied using batch method. Various parameters such as pH, agitation time, RB5 concentration and temperature were studied. The resins showed high affinity for the adsorption of RB5 where uptake values of 0.63, 0.45, and 0.33 mmol/g were reported for resins RI, RII, and RIII, respectively at 25°C. Both kinetics and thermodynamic parameters of the process were estimated. These data indicated an endothermic spontaneous adsorption process and kinetically followed the pseudo-second order model, Fickian diffusion low and Elovich equation. Desorption of RB5 from the surface of the prepared resins was efficiently done using sodium hydroxide.