Adsorption of Acetamiprid and p-Cresol from Water in Single Component System and Binary Components System with the Adsorption Resin Modified with Proline

Abstract

The adsorption behavoiur of acetamiprid and p-cresol in water onto the resin of ZHP02 modified with proline based on NDA150 was investigated from static adsorption experiments at different temperatures in single component and binary components system. The adsorption capacities and adsorption selectivity for acetamiprid and p-cresol in water were tested. The results show that the adsorption is fitted well by Freundlich model and Langmuir model and the adsorption of acetamiprid or p-cresol on ZHP02 is an exothermic process by the negative adsorption enthalpy. Gibbs free energy, enthalpy change and entropy change have changed in binary components system, demonstrating the existence of the cooperative effect. A high removal efficiency of 61.18-85.85 % is obtained for acetamiprid and that of 32.77-49.45 % is for p-cresol in single component system,which are both higher than those in binary components system and the cooperative adsorption exists when the equilibrium concentration is higher. The adsorption of acetamiprid onto ZHP02 has little change in the presence of p-cresol, but the adsorption of p-cresol onto ZHP02 will be weakened significantly in the presence of acetamiprid. The adsorption selectivity index of acetamiprid on ZHP02 is larger than one,which can favour to apply ZHP02 for the successful separation and recovery of acetamiprid from the water containing p-cresol.