Adsorption of Lanthanum(Ⅲ)by Sodium-Modified Vermiculite
Sodium-modified vermiculite(Na-Ve)was prepared with Na2CO3 solution as modifier.Na-Ve was characterized and analyzed by SEM,EDS,FT-IR,XRD,etc.The adsorption behavior of La(Ⅲ)by Na-Ve was studied by static adsorption experiment.The results show that Na-Ve maintains the lamellar structure of vermicu-lite,and the average pore size increases.The adsorption capacity of La(Ⅲ)by Na-Ve is significantly higher than unmodified vermiculite,with a maximum adsorption capacity of 37.7 mg·g-1.The removal rate of La(Ⅲ)by Na-Ve can been larged with increasing the dosage,adsorption time,pH,temperature,and decreasing the initial concentration of solution.The La(Ⅲ)removal rate can reach 100％at the pH value of 6,the dosage of 1.5 g·L-1 and 30 ℃.The adsorption of La(Ⅲ)by Na-Ve is a spontaneous endothermic process,which follows the Langmuir adsorption isotherm and accords with the quasi-second-order kinetic equation.
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