Adsorption and removal of sulfonic dyes from aqueous solution onto a coordination polymeric xerogel with amino groups

A coordination polymeric xerogel based on copper acetate and 2-amino-5-mercpto-1,3,4-thiadiazole was prepared and characterized by SEM, EDX and FTIR, respectively. It exhibits favorable adsorption behavior for sulfonic dyes such as Thymol blue, Acid fuchsin and Methyl orange. The effects of various experimental parameters including initial dye concentrations, exposure time, temperature, pH and ion strength were investigated. Adsorption kinetics, isotherms and adsorption mechanism were also analyzed. The desorption profile revealed that a significant portion (>80%) of sulfonic dyes could be desorbed by using sodium chloride aqueous solution as eluting agent. (C) 2015 Elsevier B.V. All rights reserved.