粘土矿物对低浓度镧、钕的吸附性研究

采用振荡平衡法,对高岭土、膨润土、凹凸棒石等3种不同类型的粘土矿物进行低浓度稀土元素镧、钕的吸附试验；通过ICP测定培养溶液的平衡浓度和吸附量,绘制各自的等温吸附曲线并拟合吸附热力学方程.得出 Langmuir方程能较好地描述低浓度条件下3种粘土矿物对稀土元素(La,Nd)的等温吸附过程；发现3种粘土矿物对稀土元素(La,Nd)的吸附性能大小排序为:膨润土＞凹凸棒石＞高岭土,吸附性能表现的差异性主要由粘土矿物自身的晶层结构决定.

Adsorption of Low Concentration of La3+ , Nd3+ by Clay Minerals

An oscillation-balance method was applied to research the adsorption features of kaoline,betonite and attapulgite to the rare earth elements under the low concentration.The ICP was used to determine the equilibrium concentration and adsorption,the adsorption isotherm curves obtained and the thermodynamic equations of adsorption was fitted.The result was that the Langmuir equation could describe better the isothermal adsorption process of the three kinds of clay minerals to the rare earth elements(La,Nd) on ...