温度对活性炭纤维吸附苯酚的热力学和动力学性能的影响  

Effects of temperature on thermodynamics and dynamics performances for adsorption of phenol on activated carbon fibers

作　　者：薛莲[1] 许茜[1] 邢卫红[1] 居沈贵[1] 

机构地区：[1]南京工业大学化学化工学院国家特种分离膜工程技术研究中心,江苏南京210009

出　　处：《南京工业大学学报（自然科学版）》2014年第1期28-32,共5页Journal of Nanjing Tech University(Natural Science Edition)

基　　金：国家杰出青年基金(21125629);国家自然科学基金(21076102);江苏省高校自然科学基金(10KJB530002)

摘　　要：实验考察不同温度下活性炭纤维(ACFs)对苯酚的静态吸附性能,利用Langmuir、Redlich-Peterson吸附等温模型和准二级动力学模型计算苯酚在ACFs上的动力学和热力学性能。结果表明:Redlich-Peterson吸附等温模型和准二级动力学模型能较好地描述吸附性能;升高温度,ACFs的最大吸附容量Q max减小,动力学吸附速率常数K2变大,吸附过程的吉布斯自由能ΔG的绝对值减小,吸附过程的焓变ΔH、熵变ΔS和吸附活化能E a分别为-10.2 kJ/mol、-23.6 J/(mol·K)和55.2 kJ/mol,吸附过程为物理吸附。The adsorption of phenol on activated carbon fibers （ACFs） at different temperatures was investigated by static adsorption experiments.Langmuir,Redlich-Peterson adsorption isotherm model and pesudo second-orde kinetic model were used to calculate the kinetics and thermodynamic performances of phenol on ACFs. Results showed that Redlich-Peterson and pesudo second-order equation could describe the adsorption well.The maximum adsorption capacity （Qmax） was decreased, kinetics adsorption rate constants （K2 ） increased and absolute values of Gibbs free energy （△G） decreased with the rise of the temperature. The thermodynamic constants of adsorption （ △H and AS） and activation energy （Ea） were found as - 10. 2 k J/mol,-23. 6 J/（mol-K） and 55. 2 k J/mol ,it showed that adsorption process belonged to physical adsorption.

关 键 词：吸附等温线 活性炭纤维 苯酚 

分 类 号：TQ028.8[化学工程]