Abstract: Adsorption of nickel ions in aqueous solution using NaA zeolite was studied.Influences of the main conditions,including pH,temperature,adsorption time,and initial mass concentration,on the adsorption efficiency were investigated.Results showed that the optimum adsorption pH of NaA zeolite to nickel ions was 5.5.Dynamics study demonstrated that the adsorption of nickel ions would achieve balance in about 120 min and followed the second order kinetics model better.Thermodynamics study showed that the adsorption effect of nickel ions was optimal at 45 ℃ and it followed the Langmuir isotherm better;with the initial concentration increased,the adsorption quantity increased correspondingly;the maximum adsorption capacity was 17.199 mg/g under the optimum conditions.

Key words: nickel ion, NaA zeolite, adsorption