Abstract: As the adsorbent,the adsorption performance of palygorskite clay in Xining basin to Pb²⁺ was studied.Influences of the factors,such as modified methods of clay,stirring time,clay dosage,adsorption temperature,and initial Pb²⁺ mass concentration of the solution,on adsorption effects were investigated.Results showed that the palygorskite clay in Xining basin exhibited good adsorption performance to Pb²⁺;when using sulfuric acid modifying the clay,the appropriate amount of sulfuric acid was 0.049 g per 10 g clay;and the appropriate adsorption conditions were that stirring time of 50 min,clay dosage of 0.10~0.15 g/100 mL Pb²⁺ solution,and room temperature.Under these conditions,the adsorption capacity of Pb²⁺ onto the clay reached over 107 mg/g when the initial mass concentration of Pb²⁺ in the solution was 107.65 mg/L and the removal ratio of Pb²⁺ was about 100%.Within the range of experimental mass concentration,the adsorption of Pb²⁺ onto the clay was consistent with Langmuir isotherm.

Key words: Xining basin, palygorskite clay, Pb^2+, adsorption performance