载铜活性炭吸附二甲基硫醚的热力学和动力学

摘要/Abstract

摘要： 以铜质量分数为11%的载铜活性炭（J-AC）为吸附剂，对石油醚溶液中的二甲基硫醚进行吸附，通过比表面积分析仪对吸附剂的比表面积和孔结构进行表征，利用热力学与动力学模型对试验数据进行拟合，计算热力学及动力学参数，探讨J-AC对二甲基硫醚的吸附机理。结果表明：J-AC对二甲基硫醚的吸附符合Freundlich吸附等温方程，拟合相关系数大于0.996，且不同温度下的吸附自由能（△G ）、吸附热（△H ）和吸附熵（△S ）均小于0，表明该吸附过程是一个放热的混乱度降低的自发过程；吸附过程的动力学符合拟二阶动力学模型，拟合相关系数大于0.99，随着二甲基硫醚初始浓度的增加，拟二阶速率常数逐渐减小。

关键词: 载铜活性炭, 二甲基硫醚, 吸附热力学, 吸附动力学

Abstract: Copper-loaded activated carbon (J-AC) as the adsorbent, dimethyl sulfide in the petroleum ether solution for adsorption, through the specific surface area analyzer for specific surface area and pore structure of the adsorbent were characterized. Thermodynamics and kinetics model was used to analyze the experimental data fitting and the calculation of thermodynamic and kinetic parameters, and J-AC the adsorption mechanism of dimethyl sulfide was discussed. The results showed that the adsorption of dimethyl sulfide by J-AC was in line with the Freundlich isothermal adsorption equation, the fitting correlation coefficient was greater than 0.996, and the adsorption free energy, adsorption heat and adsorption entropy at different temperatures were all less than 0. The adsorption process was a spontaneous process in which the confusion degree of exothermic heat decreased. The adsorption kinetics of the process was in line with the pseudo-second-order kinetic model, and the fitting correlation coefficient was greater than 0.992. With the increase of the initial concentration of dimethyl sulfide, the pseudo-second-order rate constant gradually decreased.

Key words: copper-loaded activated carbon, dimethyl sulfide, adsorption thermodynamics, adsorption kinetics

姜传东黄玮丛玉凤苏建. 载铜活性炭吸附二甲基硫醚的热力学和动力学[J]. 石油炼制与化工, 2021, 52(8): 64-70.

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