NKA-Ⅱ大孔吸附树脂对水中苯甲酸吸附的研究  

On Adsorbing Benzoic Acid from Water by NKA-Ⅱ Macroporous Resin

作　　者：焦晓燕[1] 朱桂琴[1] 赵娜[1] 王昌青[1] 

机构地区：[1]河北北方学院理学院,河北张家口075000

出　　处：《河北北方学院学报（自然科学版）》2011年第1期21-25,共5页Journal of Hebei North University:Natural Science Edition

摘　　要：研究NKA-Ⅱ大孔吸附树脂对水中苯甲酸的吸附行为.通过静态吸附试验,研究了NKA-Ⅱ大孔吸附树脂对水中苯甲酸吸附动力学及热力学特性.吸附符合一级动力学吸附方程,颗粒内扩散过程是影响吸附速率的主要控制步骤;吸附符合Freundlich等温吸附方程ln(qe)=lnKf+(l/n)ln Ce,数据表明,随着温度升高呈现出Kf值减少的趋势,且吸附过程ΔH为负值,其绝对值小于30 kj.mol-1,表明吸附为放热的物理吸附过程.低温有利于吸附.To investigate absorbing benzoik acid by NKA-Ⅱ macroporous resin,a study of kinetics and thermodynamics on absorbing benzoic acid by NKA-Ⅱ macroporous resin was carried through static experiments.The results indicated that the adsorption rate for the solute appeared to be the first order kinetics,and the intraparticle diffusion was main rate controlling step.The adsorption data fit well into the Freundlich adsorption isotherm equation ln（qe）=lnkf＋（l/n）ln Ce.The data indicated that the values of Kf reduced with temperature elevating and the values of ΔH during the adsorption process were negative.The absolute value of ΔH was less than 30 kJ·mol-1,so the adsorption was a type of exothermic physical adsorption process.Low temperature is beneficial for absorption benzoik acid.

关 键 词：NKA-Ⅱ大孔树脂 苯甲酸 吸附 动力学 热力学 

分 类 号：O647.32[理学—物理化学]