Elektorowicz Maria, El-Sadi Haifa, Lin Ju, Ayadat Tahar
Department of Building, Civil and Environmental Engineering, Concordia University, 1455 Maisonneuve O., Montreal, Quebec, Canada.
J Colloid Interface Sci. 2007 May 15;309(2):445-52. doi: 10.1016/j.jcis.2006.12.038. Epub 2006 Dec 16.
Clay soils have specific properties that cause difficulty in the assessment and remediation of contaminated sites. Furthermore, polyaromatic hydrocarbons, when present in soil, are difficult to extract due to their nonpolar, high molecular weight characterization. In this study, the supercritical fluid (carbon dioxide) extraction (SFE) technique, with and without methanol modifier, was used for removal of PAHs (phenanthrene) from kaolinite, illite, and montmorillonite soils. The impact of SFE parameters (fluid pressure, fluid temperature, and time), and of clay properties (such as clay minerals content, initial moisture content, soil porosity or equivalent pores size, clay surface area, cation-exchange capacity, and clay-swelling index) on the removal efficiency of PAHs from clayey soils were investigated. The results of this investigation were used to develop a semi-empirical correlation between the recovery (i.e. the extraction efficiency) at any time and above mentioned parameters and properties.
黏土具有特定的性质，这给污染场地的评估和修复带来了困难。此外，土壤中的多环芳烃由于其非极性、高分子量的特性而难以提取。在本研究中，采用了超临界流体（二氧化碳）萃取（SFE）技术，添加和不添加甲醇改性剂，用于从高岭土、伊利石和蒙脱石土壤中去除多环芳烃（菲）。研究了SFE参数（流体压力、流体温度和时间）以及黏土性质（如黏土矿物含量、初始含水量、土壤孔隙率或等效孔径、黏土表面积、阳离子交换容量和黏土膨胀指数）对黏土土壤中多环芳烃去除效率的影响。本研究结果用于建立任意时刻的回收率（即萃取效率）与上述参数和性质之间的半经验关联。
