Abstract:

In order to order to extend the recycling value of waste cotton, carboxyl modification of waste cotton was carried out, the carboxyl content and adsorption of the resulting products are accessible by increasing modification time is significantly improved. The adsorption of Cu2+ ions in aqueous solution was studied. The effects of adsorption time, the initial concentration of Cu2+ solution and the pH value of the adsorbed liquid on the adsorption performance were analyzed. The results show that the properties of modified waste cotton will be increased with the increase of adsorption time, the initial concentration of Cu2+solution and the pH value of adsorption solution. The growth rate is from high to lower and then levels out. The adsorption equilibrium time is 300 min, the initial concentration is 1400 mg?L-1, the maximum adsorption capacity of Cu2+ is 116.4 mg?g-1, and the optimum adsorption pH is 4-5. The adsorption mechanism of the modified cotton was studied by adsorption kinetics and adsorption isotherm model. The results show that the adsorption of Cu2+ on the modified waste cotton belongs to chemical adsorption. The adsorption kinetics model accords with the Pseudo– second-order kinetic model. The adsorption isotherm model agrees well with the Langmuir isotherm model and belongs to the monolayer adsorption.

Key words: waste cotton, copper ion adsorption, carboxylation modification, adsorption mechanism, absorption dinetics, adsorption isotherm