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为了获取低挥发性有机物的吸附等温线,基于Langmuir方程,提出一种推算低浓度低挥发性有机物的吸附等温线的方法.脱附活化能由改进的程序升温脱附模型进行动力学分析获得,由此获得的Langmuir方程中的平衡常数B,较经典程序升温脱附模型求算值更接近本征值,且不受是否发生再吸附现象影响;饱和吸附量可结合吸附剂表征结果可得到.此方法应用于低浓度萘在SBA-15上的吸附等温线的推算,脱附活化能为58.37 k J·mol~(-1),平衡常数为0.01149 Pa~(-1),饱和吸附量为55.11 mg·g~(-1),相对误差约5%,与实验值较好吻合.
In order to obtain the adsorption isotherms of low volatile organic compounds, a method for estimating the adsorption isotherms of low concentration and low volatile organic compounds was proposed based on the Langmuir equation.The desorption activation energy was obtained from the kinetic analysis of the improved temperature programmed desorption model, The equilibrium constant B in the Langmuir equation obtained is closer to the eigenvalue than the classical temperature programmed desorption model and is independent of whether the reabsorption phenomenon occurs or not. The saturated adsorption capacity can be obtained in combination with the characterization result of the adsorbent. The method was applied to the isotherm adsorption of SBA-15 with low concentration of naphthalene. The activation energy of desorption was 58.37 kJ · mol -1 and the equilibrium constant was 0.01149 Pa -1. The adsorption capacity was 55.11 mg · g -1, the relative error is about 5%, which is in good agreement with the experimental data.