Study on treatment of dyeing wastewater by leather waste chips-supported chitosan
Using leather waste chips as carrier,a collagen fiber-based adsorption material was prepared through loading chitosan onto leather waste chips with glutaraldehyde as cross-linking agent.The adsorption performance of the material for acidic red A-2BF was studied.The effect of the dyeing wastewater pH,adsorbent dosage,initial concentration of dyeing wastewater,and adsorption time on the adsorption performance were analyzed.An appropriate model for the adsorption process was established,its adsorption behavior was described,and the adsorption mechanism was explored.The structure of waste leather chips before and after modification was characterized by infrared spectroscopy.The results showed that the removal ratio and adsorption capacity achieved 96.7％and 188.2mg/g,respectively,after absorption for 2.0h under the conditions of an initial waste solution concentration of 100mL/L,a pH of 4.0,and an adsorbent addition of 0.05g/100mL.The adsorption process conformed to the pseudo first order kinetics and Freundlich isothermal adsorption model,and the adsorption reaction was a spontaneous endothermic process.FT-IR infrared spectroscopy analysis indicated that chitosan was successfully grafted onto chrome leather waste chips,providing adsorption sites for the adsorption of dyes.
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