合成碳羟基磷灰石对铀的吸附规律

Adsorption Principles of Uranium by Home-Made Carbonate Hydroxylapatite

采用自制的碳羟基磷灰石(CHAP)作为铀的吸附剂进行吸附实验,研究了不同pH值、反应时间、吸附剂用量、铀初始浓度等条件对吸附性能的影响,并探讨了吸附动力学行为。结果表明:在室温下pH值为5.5、吸附时间为60 min、CHAP用量为4 g/L,对初始浓度为40 mg/L的铀废水进行吸附,去除率高达98.8%,理论最大吸附容量为15.38 mg/g,吸附反应符合Langmuir和Freundlich方程。CHAP对铀的吸附动力学行为符合一级动力学方程、Elovich方程、双常数方程和抛物线扩散方程。

The adsorption of uranium by home-made carbonate hydroxylapatite is studied. The adsorption effect is controlled by pH values, adsorption period, the consumption of CHAP, the initial concentration of uranium in wastewater. The results show that the rate of the remove of uranium by CHAP increases to 98.8% and the maximum adsorption capacity is up to 15.38 mg/g when pH values is 5.5, adsorption period is 60 min, the consumption of CHAP is 4 g/L, the initial concentration of uranium in wastewater is 40 mg/L. The adsorption isotherms for uranium can be well fitted by both Langm for uranium at room temperature can be described uir and Freundlich equation. The equilibrium sorption data by the first-order kinetic model, the Elovich equation, the double constant equation and parabola equation.