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 kJ·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.
To get the adsorption data of low-volatile organic compounds, a method for estimating the adsorption isotherm of low concentration and low-volatile organics was proposed based on the Langmuir equation. The desorption activation energy was calculated by a modified temperature program desorption ( TPD) model, which is much closer to the intrinsic value, and then the Langmuir equi-librium constant B was obtained. In combination with sorbent characterization results, it was easy to estimate the saturated adsorption capacity. The adsorption isotherm of low concentration naphthalene on SBA-15 was estimated. The desorption activation energy, balance constant, and saturated adsorption capacity are 58. 37 kJ·mol-1 , 0. 01149 Pa-1 and 55. 11 mg·g-1 , respectively. The calcu-lated values are in good agreement with experimental results, and the relative error is about 5%.