合成了一种L-酪氨酸修饰的螯合吸附树脂(AJS-02),并与超高交联树脂NDA-150作对比,研究了其对Cu~(2+)的吸附和脱附行为. 静态实验结果表明,在研究的浓度范围内,吸附平衡数据符合Langmuir等温吸附方程. Cu~(2+)在AJS-02上的吸附量大于其在NDA-150上的吸附量. Cu~(2+)在2种树脂上的吸附过程为物理和化学作用的共同结果. 吸附动力学符合液膜扩散方程,液膜扩散为吸附速率的主要控制步骤. 动态吸附-脱附实验表明,动态穿透吸附量和总吸附量分别为4.05×10~(-3)和6.44×10~(-3) mol/L,使用5%HCl进行脱附,脱附率达到90%以上.
An adsorption resin modified by L-tyrosine acid, AJS-02, was synthesized, and its adsorption-desorption performance for Cu~(2+) was compared with that of NDA-150. The equilibrium adsorption data were fitted to Langmuir isotherm and the adsorption capacity for AJS-02 was higher than that of NDA-150, which may be attributed to the polar groups in the network of AJS-02. The adsorption of Cu~(2+) to AJS-02 involved physisorption and chemisorption. Kinetic analysis shows that the adsorption rate was mainly governed by the film diffusion. Dynamic adsorption and desorption studies for Cu~(2+)to AJS-02 show that the breakthrough adsorption capacity and the total adsorption capacity were 4.05×10~(-3) and 6.44×10~(-3) moles per liliter resin, respectively. Above 90% regeneration efficiency for the adsorbent was achieved by the desorption of 5% hydrochloric acid.
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