氨基酸螯合吸附树脂对Cu2+的吸附行为

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。

Study on Adsorption of Copper Ions onto Amine Acid Chelated Adsorption Resin

The synthesis of AJS-02 modified by L-tyrosine acid and a comparison of adsorption-desorption performance toward Cu2+ between NDA-150 and AJS-02 were investigated. The results showed that equilibrium adsorption data fitted to Langmuir isotherms and the adsorption capacity is higher on AJS-02 thanon NDA-150 in our study, which may be attributed to the polar groups on the network of AJS-02. The adsorption of Cu2+ on AJS-02 is a procedure of the coexistence of physisorption and chemisorption. Kinetic analysis shows that the adsorption rate was mainly governed by film diffusion. Dynamic adsorption and desorption studies for Cu2+on AJS-02 show that the breakthrough adsorption capacity and the total adsorption capacity are 4.05×10-3 and 6.44×10-3 mmol per milliliter resin, respectively. Above 90% regeneration efficiency for the adsorbent was achieved by the desorption of 5% hydrochloric acid.