不同条件对活性炭吸附挥发性有机物的影响

以二氯甲烷和乙醇为模型，研究了活性炭对不同水溶性VOC气体的吸附效果以及改性炭对含水气体的吸附情况.结果表明，活性炭在吸附二氯甲烷时，当气体中水分含量过多时，吸附会受到干扰，并且会产生脱附现象，吸水饱和炭几乎没有吸附作用.而在处理乙醇时，乙醇中的水分对吸附量影响较小.使用改性炭处理二氯甲烷时，其吸附量虽有下降，约为原来的60%，但改性炭能减轻水分对二氯甲烷吸附的干扰和脱附.

The study of effect of activated carbon adsorbing volatile organic compounds under different conditions

The adsorption process of activated carbon on the moisture content of gas and the adsorptivity of modified carbon on gas containing water are researched, using dichloromethane and alcohol as model pollutants. The results are as follows： during the process of dealing with dichloromethane, adsorption process is divided into three proces- ses. When there was excessive moisture content in the gas, the adsorption decreased evidently, and the adsorbate was desorbed from the activated carbon. There is even almost no adsorbed substance when exhaust gas was adsorbed using carbon of saturated water. During the process of dealing with grain alcohol, moisture content in gases has less impact on adsorption capacity. Even if activated carbon adsorbed enough water, there is still much adsorption. On the experiment of adsorbing VOC using modified carbon showed that the adsorption of modified carbon increases while the decrease to 60% in absorbent, but it can reduce the effect of moisture content on gas adsorption.