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利用废弃的花生壳对水中苯酚进行吸附试验,考察了吸附的最佳条件、吸附热力学和动力学特征。采用Langmuir和Freundlich等温线对平衡数据进行了线性拟合,结果表明,花生壳对苯酚的吸附平衡符合Freundlich等温方程。在298K下,吸附焓变$H=-5.12kJ·mol-1,自由能变$G=-4.41 kJ·mol-1,熵变$S=-2.38J·mo l-1·K-1。表明:该吸附过程为自发进行的放热过程,其动力学行为更好的符合Lagergren准二级动力学模型。
Adsorption experiments of phenol in water with abandoned peanut shells were carried out to investigate the optimum adsorption conditions, adsorption thermodynamics and kinetic characteristics. The Langmuir and Freundlich isotherms were used to fit the equilibrium data linearly. The results showed that the adsorption equilibrium of phenol by peanut shells was in accordance with the Freundlich isotherm equation. At 298K, the enthalpy change of $ H = -5.12kJ · mol-1, the change of free energy $ G = -4.41 kJ · mol-1, and the entropy change $ S = -2.38J · mol-1 · K-1. The results show that the adsorption process is a spontaneous exothermic process and its kinetic behavior is in good agreement with the Lagergren quasi-second-order kinetic model.