伊利石和高岭石对U(Ⅵ)的吸附

以伊利石和高岭石为吸附剂，通过静态吸附法研究了其对U(Ⅵ)的吸附特性。考察了接触时间、初始浓度、吸附剂质量、pH、温度、离子种类、腐殖酸等对其吸附效果的影响；采用红外光谱(FTIR) 对伊利石和高岭石的结构进行了表征。研究结果表明：伊利石和高岭石对U(Ⅵ)具有很强的吸附能力，在10 h、铀初始质量浓度为30 mg/L、吸附剂质量为0.04 g、pH=5的条件下，伊利石对U(Ⅵ)的吸附效果最好；在12 h、铀初始质量浓度为30 mg/L、吸附剂质量为0.01 g、pH=5的条件下，高岭石对U(Ⅵ)的吸附效果最好；随着温度的升高，伊利石和高岭石对U(Ⅵ)的吸附能力不断增强，尤其是伊利石；溶液中Mg²⁺、CO^2-₃、HCO^-₃显著降低了伊利石和高岭石对U(Ⅵ)的吸附效果；随着腐殖酸浓度的增加，伊利石对U(Ⅵ)的吸附能力提高，高岭石对U(Ⅵ)的吸附能力降低。

Adsorption of Illite and Kaolinite for U(Ⅵ)

The adsorption behavior of U(Ⅵ) on illite and kaolinite was studied as a function of adsorption time, initial concentration of U(Ⅵ), adsorbent mass, pH, temperature, the type of ionic species and humic acid by the static experimental method; the structure of the illite- and kaolinite were characterized by FTIR. The experimental results display that the illite have the best adsorption effect on U(Ⅵ) at the initial mass concentration of 30 mg/L, adsorbent mass of 0.04 g, 10 h and pH=5; the kaolinite have the best adsorption effect on U(Ⅵ) at the initial mass concentration of 30 mg/L, adsorbent mass of 0.01 g, 12 h and pH=5; the adsorption capacity of illite and kaolinite is enlarged with the increasing of temperature, especially illite. Mg²⁺, CO^2-₃ and HCO^-₃ in solution significantly reduce the adsorption of U(Ⅵ) by illite and kaolinite; with the increase of humic acid, the adsorption capacity of illite improves, but the adsorption capacity of kaolinite decreases.