关键词: 聚合物, 合成, 吸附, 热力学

Abstract:

A polyamine functionalized polystyrene resin (PSACP) was prepared via substitution reaction of chloroacetylized polystyrene resin (PSAC) with polyethyleneimine (PEI). Multiple reaction factors including solvent, temperature, reactant ratio, and reaction time for the PSACP preparation were investigated. An optimal total exchange capacity of 5.21mmol/g was achieved when the reaction was conducted for 5h at 50℃ with DMF as solvent and the ratio of n(PEI): n(PSAC) to be 6:1. This PSACP showed a good adsorptive activity towards Cu²⁺ in aqueous solution which was also affected by temperature, initial concentration and pH. A maximum equilibrium adsorption capacity of 2.42mmol/g was obtained when the adsorption was performed at 45℃, pH=5.7, and an initial concentration of 0.5mg/mL. The adsorption data fit well to the Langmuir model, indicating a mono-layer adsorption process. The adsorbent could be easily regenerated and was reused for three times without significant loss of the adsorptive capacity. The dynamic adsorption of Cu²⁺ was rapid at 25℃ with a^{dynamic saturated adsorption capacity of 2.74mmol/g. After desorbed with 1mol/L HCl, the resin could be regenerated with 83.8% of Cu2+ being recovered, and no tailing phenomena was observed during the desorption.}

Key words: polymer, synthesis, adsorption, thermodynamics