氨基酸螯合吸附树脂对苯酚的吸附行为研究  

ADSORPTION OF PHENOL ONTO AMINO ACID CHELATED ADSORPTION RESIN

作　　者：孟冠华[1] 欧承慧[1] 陶冬民[1] 刘宝河[1] 

机构地区：[1]安徽工业大学建筑工程学院,马鞍山243002

出　　处：《高分子学报》2009年第12期1245-1251,共7页Acta Polymerica Sinica

基　　金：安徽省教育厅自然科学研究项目(项目号KJ2007B167)资助

摘　　要：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,研究了其对苯酚的吸附和脱附行为.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等温吸附方程且吸附为放热过程.溶液的初始浓度为100 mg/L、吸附温度为288 K时,苯酚在AJS-02和NDA-150上的平衡吸附量分别为76.98和91.97 mg/g,苯酚在两种树脂上的吸附是比表面积和表面官能团共同作用的结果.动力学数据表明吸附动力学符合液膜扩散方程和颗粒内扩散方程,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,AJS-02树脂对苯酚的动态穿透吸附量和饱和吸附量分别为5.26×10-2和6.60×10-2mmol/mL,采用95%乙醇作脱附剂,脱附率可达91.5%以上.To explore the possibility of treating polluted water containing both organics and heavy metals, the synthesis of polystyrene-divinylbenzene AJS-02 modified by L-tyrosine acid and a comparison of adsorption- desorption performance toward phenol on NDA-150 and AJS-02 had been investigated. Tt was shown that the equilibrium adsorption data fitted to Langmuir isotherms, and the adsorption capacity decreased with increase of temperature suggesting the exothermic process. The equilibrium adsorption capacity of AJS-02 and NDA-150 toward phenol was 76.98 mg/g and 91.97 mg/g, respectively when the initial concentration was 100 mg/L and the adsorption temperature was 288 K. These results might be attributed to both the specific surface areas and the polar groups on the network of resins. Thermodynamic studies suggested that the adsorption of phenol on AJS-02 was a procedure of coexistence of physisorption and chemisorption. The kinetic data fitted to both the intraparticle diffusion equation and the film diffusion equation for NDA-150 and AJS-02. It was shown that the adsorption rate was mainly governed by film diffusion. It was showed in dynamic adsorption and desorption experiments for phenol on AJS-02 the breakthrough adsorption capacity and the total adsorption capacity were 5.26 × 10^-2 mmol and 6.60 × 10^-2 mmol per milliliter resin, respectively. 91.5% regeneration efficiency for AJS-02 was achieved by 95% ethanol in our study.

关 键 词：AJS-02 NDA-150 苯酚 吸附 脱附 

分 类 号：X703.1[环境科学与工程—环境工程]