低浓度萘在SBA-15上吸附等温线推算

Determination of low concentration naphthalene adsorption isotherms on SBA-15

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.

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 equilibrium 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 k J·mol^- 1,0.01149 Pa- 1and 55.11 mg·g^- 1,respectively.The calculated values are in good agreement with experimental results,and the relative error is about 5%.