VOCs在MAC上吸附等温线的测定与拟合

Measurement and simulation of adsorption isotherms of VOCs on MAC

大气中挥发性有机物(VOCs)所造成的污染严重地危害人体健康,引起了社会公众和政府的高度重视,研究高效的VOCs治理技术已是一个刻不容缓的课题.本文主要研究用微电磁天平在线测定20、60、90、140℃时甲苯、丁醇和乙酸乙酯在蜂窝状活性炭MAC上的吸附等温线,并用Langmuir、Freundlich、Langmuir-Freun-dlich、DR和Toth方程对吸附实验等温线进行了拟合.结果表明,MAC对3种VOCs都有比较大的吸附容量,是一种有效的治理VOCs的方法;无论在低浓度下还是在高浓度下,Toth方程都能够很好地拟合甲苯、丁醇和乙酸乙酯在MAC上的吸附等温线,相对误差不超过±6%.

Air pollution is an issue of concern worldwide. Adsorption processes with activated carbons are widely used to remove volatile organic compunds （VOCs） from gas streams that are generated from a wide range of industries. The isotherms of toluene, butanol, ethyl acetate on monolith activated carbon （MAC） were measured with micro-balance at 20℃, 60℃, 90℃ and 140℃, respectively. The Langmuir, Freundlich, Langmuir-Freundlich, DR and Toth adsorption equations were used to simulate the isothems. The results showed that MAC had a high adsorption capacity for these three VOCs. At both high and low VOCs partial pressure, the agreement between the Toth model fitting and the experimental data was very good. The relative error was less than ±6%.