(1. 福建师范大学福清分校 生物与化学工程系，福州 350300；
2. 福州大学 至诚学院，福州 350002；
3. 福州大学 化学化工学院，福州 350108)
摘 要: 采用离子交换树脂法吸附铬(Ⅲ)，通过树脂选型确定强酸性阳离子交换树脂001×14.5对铬(Ⅲ)吸附容量最大，用所选的001×14.5树脂研究铬(Ⅲ)的吸附性能。静态吸附实验表明：转速大于120 r/min时，对树脂吸附的影响可忽略，即外扩散基本消除，pH=7.0时，吸附最佳，铬(Ⅲ)吸附率随树脂用量的增加而增大；001×14.5树脂吸附铬(Ⅲ)的过程符合Langmuir等温曲线，且为优惠吸附；吸附过程符合拟二级动力学方程，吸附过程的表观活化能Ea=23.4 kJ/mol，颗粒内扩散为吸附速率的主要控制步骤；用1 mol/L 的硫酸对吸附后的饱和树脂进行脱附再生，脱附率可达99%。
关键字: 离子交换树脂；铬(Ⅲ)；吸附；热力学；动力学
（1. Department of Biological and Chemical Engineering, Fuqing Branch of Fujian Normal University,
Fuzhou 350300, China;
2. Zhicheng College, Fuzhou University, Fuzhou 350002, China;
3. College of Chemistry and Chemical Engineering, Fuzhou University, Fuzhou 350108, China）
Abstract:Using ion exchange resin to adsorb Cr(Ⅲ), 001×14.5 strong acidic cation ion exchange resin shows the best capacity through the resin selection experiment. The adsorption properties of selected 001×14.5 resin for Cr(Ⅲ) were studied, and the effects of various parameters, including stirring speed, resin dosage and solution pH were studied by static experiments. The results indicate that the effect of external diffusion is eliminated when the stirring speed is over 120 r/min, the better pH value is 7, the percent removal of Cr(Ⅲ) increases with the resin dosage consumption increasing. The adsorption behavior of 001×14.5 for Cr(Ⅲ) obeys the Langmuir isotherm, which is favourable adsorption. The adsorption of Cr(Ⅲ) on this resin follows pseudo-second- order kinetic model, the apparent activation energy is 23.4 kJ/mol, the kinetics experiments show that the particle diffusion is the main limiting rate step. The saturated resin can be regenerated by 1 mol/L sulfuric acid, and the desorption rate reaches 99%.
Key words: ion exchange resin; Cr(Ⅲ); adsorption; thermodynamics; kinetics
