活性炭对水体中呋喃它酮吸附的热力学与动力学研究

Kinetics and the thermodynamics for adsorption of furaltadone by activate carbon

研究了活性炭对水体中呋喃它酮的吸附热力学和动力学特性以及相应的吸附率。测定了298.0、303.0、308.0、313.0 K4个温度下呋喃它酮的稳态吸附量。结果表明,该吸附符合Freundlich等温吸附方程,焓变ΔH=4.01 kJ/mol(<40 kJ/mol),该吸附为物理吸附,吉布斯自由能变(ΔG)<0,表明吸附质被吸附的过程是自发形成的。4个温度下的动力学吸附数据显示表明,该吸附过程符合伪二级动力学描述,表观活化能Ea为20.23 kJ/mol。

The absorption rate and the kinetic and thermodynamic parameters for the absorption of furaltadone aqueous solution by activated carbon fiber were studied.Research on the thermodynamic behavior were based on steady state absorption quantity of furaltadone under 298,303,308,313 K separately,and the results indicated that the absorption of furaltadone obeyed the Freundlich isotherm model.The enthalpy change of absorption ΔH was 4.01 kJ/mol,which indicated that the absorption was an endothermic process,and ΔH〈 40 kJ/mol demonstrated that the absorption process was mostly physical adsorption.Meanwhile,Gibbs free energy ΔG were negative and free from the influence of temperature,which indicated that the absorption was a spontaneous process.Kinetic parameters were determined from the absorption quantity throughout the procedure of furaltadone under 298,303,308,313 K separately,and results showed that absorption of furaltadone by activated carbon fiber was best described by pseudo-second-order kinetic model,and the apparent activation energy Ea was detected to be 20.23 kJ/mol,indicated that physical effect dominate the whole process.