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为达到Nd3+富集目的,实验研究D001树脂静态吸附稀土Nd3+过程。通过单因素实验优化平衡吸附条件,并研究树脂吸附稀土Nd3+的热力学和动力学特征。结果表明:T=293 K,pH=3.5,[Nd3+]浓度10 mmol·L-1条件下,树脂的饱和吸附容量达到698.9×10-3mmol·g-1;吸附过程遵循Langmuir等温方程,热力学参数为:ΔH=13.45 kJ·mol-1,ΔS=53.035 J·mol-1·K-1,ΔG=-2.09 kJ·mol-1。热力学函数ΔG<0表明D001树脂吸附Nd3+过程能够自发进行。准二级动力学模型能够很好拟合DO01树脂吸附Nd3+的过程并且其相关系数在0.99以上。吸附活化能Ea=1.04857 kJ·mol-1,反应控制步骤为膜扩散和颗粒内扩散联合扩散控制。
In order to achieve Nd3 + enrichment, the experimental study D001 resin static adsorption rare earth Nd3 + process. The equilibrium adsorption conditions were optimized by single factor experiments, and the thermodynamic and kinetic characteristics of rare earth Nd3 + adsorbed by the resin were studied. The results showed that the saturated adsorption capacity of resin reached 698.9 × 10-3mmol · g-1 under the conditions of T = 293 K, pH = 3.5 and concentration of [Nd3 +] of 10 mmol·L-1. The adsorption process followed the Langmuir isotherm equation and the thermodynamic parameters ΔH = 13.45 kJ · mol-1, ΔS = 53.035 J · mol-1 · K-1, ΔG = -2.09 kJ · mol-1. The thermodynamic function ΔG <0 indicates that the D001 resin can adsorb Nd3 + spontaneously. The quasi-second-order kinetic model can fit well the adsorption of Nd3 + on DO01 resin and its correlation coefficient is above 0.99. The activation energy of adsorption Ea = 1.04857 kJ · mol-1, the reaction control step for the film diffusion and intra-particle diffusion combined diffusion control.