REMOVAL OF 4-CHLOROPHENOL FROM AQUEOUS SOLUTIONS BY CYCLODEXTRIN POLYMER

摘要

The removal of 4-chlorophenol (4-CP) from aqueous solutions by β-cyclodextrin polymer (β-CDP) has been studied. The effects of contact time, pH, NaCl concentration and initial 4-CP concentration were studied to obtain the best experimental conditions. Results of batch experiments showed that β-CDP exhibited high sorption capacities toward 4-CP (up to 24.4 mg/g when initial concentration of 4-CP solution was 140 mg/L at 283K). Adsorption kinetics followed a pseudo 2nd order (Ho and McKay) equation, suggesting that the rate-limiting step may be chemi-sorption. Freundlich isotherm gave the best correlation for the adsorption of 4-CP on β-CDP. The regeneration capacity of β-CDP was so strong that it could be used as a kind of recyclable adsorbent.