(1. 福建師范大學(xué)福清分校 生物與化學(xué)工程系，福州 350300；
2. 福州大學(xué) 至誠學(xué)院，福州 350002；
3. 福州大學(xué) 化學(xué)化工學(xué)院，福州 350108)
摘 要: 采用離子交換樹脂法吸附鉻(Ⅲ)，通過樹脂選型確定強酸性陽離子交換樹脂001×14.5對鉻(Ⅲ)吸附容量最大，用所選的001×14.5樹脂研究鉻(Ⅲ)的吸附性能。靜態(tài)吸附實驗表明：轉(zhuǎn)速大于120 r/min時，對樹脂吸附的影響可忽略，即外擴散基本消除，pH=7.0時，吸附最佳，鉻(Ⅲ)吸附率隨樹脂用量的增加而增大；001×14.5樹脂吸附鉻(Ⅲ)的過程符合Langmuir等溫曲線，且為優(yōu)惠吸附；吸附過程符合擬二級動力學(xué)方程，吸附過程的表觀活化能Ea=23.4 kJ/mol，顆粒內(nèi)擴散為吸附速率的主要控制步驟；用1 mol/L 的硫酸對吸附后的飽和樹脂進行脫附再生，脫附率可達99%。
關(guān)鍵字: 離子交換樹脂；鉻(Ⅲ)；吸附；熱力學(xué)；動力學(xué)
（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
