Study on the Adsorption Behavior of Acid Dyes on Collagen Fiber

The adsorption of acid black dye NT on collagen fiber (CF) was studied, and the effects of temperature, pH, initial dye concentration, adsorbent dosage and reaction time on the dye adsorption were tested, respectively. The results indicated that the optimal temperature and pH of acid black dye NT absorption were 40°C and 2.0, respectively. For a certain concentration of dyeing, the adsorption capacity decreased with the increasing of adsorbent dosage, but increased along with the extension of the contact time. In addition, the adsorption isotherms and kinetics of acid black dye NT on CF were investigated. By comparison, it was found that the Freundlich equation and Pseudosecond-order kinetic model can better describe the adsorption behavior of acidic black dye on CF. Thermodynamic parameters, such as G, H and S were determined to be-3.445 kJ/mol, 11.2 kJ/mol and 59.6 J/(mol·K), respectively. The results indicated that the adsorption was a spontaneous endothermic nature.