磁性离子交换树脂对水中双酚-A的吸附特性研究  

Adsorption characteristics of bisphenol-A in water by magnetic ion exchange resin

作　　者：官奕宏 吕谋[1] 李红卫[1] 

机构地区：[1]青岛理工大学环境与市政工程学院,山东青岛266033

出　　处：《供水技术》2015年第3期4-8,共5页Water Technology

基　　金：国家自然科学基金项目(51078193)

摘　　要：研究了磁性离子交换(MIEX)树脂对双酚-A(BPA)的吸附过程,考察了初始浓度、温度、p H、共存离子和天然有机物等因素对吸附过程的影响,对试验结果进行了动力学和热力学分析。结果表明,MIEX树脂对BPA有很好的吸附效果,但是吸附量受BPA初始浓度的影响,随着初始浓度的增加,吸附量也增加;p H值小于8.0时,MIEX对BPA的吸附效果较好;共存阴离子的竞争吸附能力顺序为NO-3>SO2-4>HCO-3>HPO2-4;腐殖酸的存在会减少BPA在MIEX树脂上的吸附量。该吸附过程更符合Langmuir模型,最大吸附容量为48.98 mg/g,温度越高最大吸附容量越低;伪二级动力学可以很好地描述BPA在MIEX树脂上的吸附;热力学分析说明MIEX树脂对BPA的吸附是自发进行的,吸附过程放热,因此升温不利于反应进行。The adsorption process of bisphenol-A （BPA） was studied by magnetic ion exchange （MIEX） resin. The effects of initial concentrations, temperature, pH, coexisting anions and natural organics on BPA adsorption were investigated, and kinetic and thermodynamic analysis were conducted in the test results. The results showed that MIEX resin had a good adsorption effect on the BPA, and the adsorption capacity was influenced by initial concentration of BPA. The adsorption capacity was increased with the increase of initial concentration. The adsorption effect of BPA was satisfied by MIEX when the pH was less than 8.0, the competitive adsorption capacity order of coexisting anions was NO3^- 〉 SO4^2- 〉 HCO3^- 〉 HPO4^2-, and the humic acid could reduce BPA adsorption capacity in the MIEX resin. The adsorption equilibrium could be well fitted by Langmuir isotherm, the maximum adsorption capacity was 48.98 mg/g, and the maximum adsorption capacity was decreased with the increase of temperature. The BPA adsorption in MIEX resin agreed with the pseudo second-order kinetic model. BPA adsorption was a thermodynamically spontaneous and an exothermic process, and the adsorption capacity was decreased with the increase of temperature.

关 键 词：MIEX树脂 BPA 等温吸附模型 动力学 热力学 

分 类 号：TU991.24[建筑科学—市政工程]