岩溶地下河入口洞穴固结土对BTEX吸附-解吸研究  

Adsorption/Desorption of BTEX by Consolidated Soil Collected from a Karst Underground River Cave

作　　者：潘勇军[1] 陈余道[1] 蒋亚萍[1] 孙自森 

机构地区：[1]桂林理工大学环境科学与工程学院,广西桂林541006

出　　处：《环境科学与技术》2016年第11期52-57,共6页Environmental Science & Technology

基　　金：国家自然科学基金项目(41172229);国家科技支撑计划项目课题:漓江流域面源污染控制和水土流失治理技术研究和示范(2012BAC16B02)

摘　　要：为更好地认识岩溶含水介质与芳香烃BTEX之间的吸附特征,该文在实验室和洞穴条件下研究了岩溶洞穴中的固结土对BTEX的吸附动力学,以及在实验室条件下的吸附-解吸热力学特征。结果表明固结土对BTEX的吸附24 h达到平衡,其动力学过程适合用假二级动力学模型描述（R2〉0.937）,2种条件下固结土对苯系物总吸附量基本相等,分别为0.032 1和0.030 4 mg/g;吸附等温线最适合用Henry模型描述,BTEX分配系数介于0.002 7~0.004 5 L/g;苯和甲苯的解吸等温线适合用Henry模型描述,解吸过程存在滞后现象,滞后系数分别为5.93和5.00。To better understand the adsorption characteristics between karst aqueous media and aromatic BTEX, the adsorption kinetics of BTEX on the consolidated soil collected from a karst underground river cave in Guilin was studied under the conditions of laboratory and cave,as well as the adsorption-desorption thermodynamic under the condition of laboratory. Results showed that the adsorption equilibrium occurred within 24 hours and the process was suitable for the pseudo-second order kinetic model. The total adsorption amount of BTEX on the soil in laboratory was 0.032 1 mg/g,similar to that amount of 0.030 4 mg/g in the cave. The adsorption isotherms of BTEX on consolidated soil were better suitable to be described by the Henry model,with which the distribution coefficients of BTEX ranged from 0.002 7 to 0.004 5 L/g. The desorption isotherms of benzene and toluene on consolidated soil could be described by the Henry model. However,the process of desorption had hysteresis,and the hysteresis coefficients were 5.93 and 5.00,respectively.

关 键 词：固结土 苯系物 吸附动力学 吸附等温线 解吸等温线 岩溶洞穴 

分 类 号：X131.2[环境科学与工程—环境科学]