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Qmax减小,动力学吸附速率常数砭变大,吸附过程的吉布斯自由能AG的绝对值减小,吸附过程的焓变△H、熵变△S和吸附活化能Ea分别为-10.2kJ/mol、-23.6J/(mol·K)和55.2kJ/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.