removal of some brilliant dyes by poly acrylic acid hydrogel beads

The current work discusses the removal of brilliant dyes. these dyes were brilliant cresyl blue (bcb) and brilliant green (bg) by the use of poly acrylic acid hydrogel beads (paa). we examined the adsorption isotherms and found that the factors preferring it are temperature and salt, shaking effects, wet paa, (bcb) and (bg) follows freundlich equation more than other equations. based on the results, there is a positive correlation between adsorption of dyes (bcb and bg) and temperature (endothermic process). we calculated the thermodynamic functions (δg, δs, and δh). the ion strength effects on the adsorptions at (20 °c) increased adsorption if the salt concentrations is high. we treated the kinetics outcomes based on lagergren equation for the first-order and the second-order equations. the kinetics experimental data show that the adsorptions were the pseudo first-order change based on the changing conditions.