Incorporation of Copper/Melamine Complexes in Silica Surface Andtheir Sorption Activity of Organic Dye

The efficiency and performance of supported melamine/ copper complexes, S/[CuCl۲(Mel)۲].۲MeOH, as a new adsorbent, for the adsorptive removal of Indigo Carmine (IC) from aqueous solutions, has been evaluated with respect to several experimental conditions including contact time, initial IC concentration, temperature and adsorbent dosage. The maximum removal percentage (approximately ۸۴%) was observed when used ۰.۰۵ g/L of S/[CuCl۲(Mel)۲].۲MeOH, ۱.۵ x ۱۰-۵mol/L of initial IC concentration and contact time of ۱۵min. The experimental data were analyzed by the Langmuir, Freundlich, and Tempkin isotherm models. The monolayer adsorption capacity of S/[CuCl۲(Mel)۲].۲MeOHwas found to be ۱۶.۸ x ۱۰-۳mol/g by using Langmuir isotherm model. The calculation of the thermodynamic parameters such as Gibbs free energy, entropy and enthalpy changes of the ongoing adsorption process indicated the feasibility and endothermic nature of IC adsorption. The kinetics study suggested that the adsorption of IC onto S/[CuCl۲(Mel)۲].۲MeOH proceeds according to the pseudo-second-order model.

کلیدواژه ها:

Melamine complexes ، Characterization ، Removal ، Adsorption ، indigo Carmine