• 关键词：有机废气  活性炭  吸附平衡  水蒸汽  相对湿度  吸附势理论

• 基金项目：

• 高华生
• 浙江大学环境工程研究所,杭州 310027

• 汪大翚
• 浙江大学环境工程研究所,杭州 310027

• 叶芸春
• 镇海炼油化工股份有限公司,宁波 315207

• 谭天恩
• 浙江大学环境工程研究所,杭州 310027

• 摘要：采用吸附柱穿透曲线法测定了30℃不同相对湿度(RH)下4种低浓度有机蒸气(VOC)在活性炭上的等温吸附量.结果表明,水蒸汽对VOC吸附平衡的抑制作用,随着RH的增大、VOC浓度的降低而增大,且随着VOC分子极性的增强而有所增大;VOC对水蒸汽吸附平衡的抑制作用,随着VOC分子极性的增强而有所减弱.提出一个基于竞争吸附机理的PolanyiDubinin方程,解释空气湿度对低浓度VOC在活性炭上吸附平衡的影响.

• Abstract：Binary adsorption uptakes of 4 low concentration VOCs (benzene, toluene, chloroform and acetone) on activated carbon were determined using Long Column method at 30℃ under humid conditions (RH=0～100%). Results shows that the depression effect of atmospheric humidity on the adsorption equilibrium of VOCs increased with increasing RH and decreasing concentration of VOCs and seemed to increase with increasing polarity of VOC molecules. The adsorption of VOCs also caused the decrease of adsorption uptakes of water vapor, in which the VOCs with weaker polarity seemed to have greater influence than that with stronger polarity. A mechanism of the competitive adsorption based on potential theory was proposed to explain the binary equilibrium of VOCs and water vapor mixtures.

• Key words：VOCs  activated carbon  adsorption equilibrium  water vapor  relative humidity  potential theory

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