SUPERCRITICAL FLUID EXTRACTION OF AROMATIC CONTAMINANTS FROM A SANDY LOAM SOIL

被引：28

作者：

ANDREWS, AT

AHLERT, RC

KOSSON, DS

机构：

[1] Department of Chemical and Biochemical Engineering, Rutgers, the State University of New Jersey, Piscataway, New Jersey, 08855

来源：

ENVIRONMENTAL PROGRESS | 1990年 / 9卷 / 04期

关键词：

D O I：

10.1002/ep.670090413

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Near‐critical fluids and liquefied gases can achieve high efficiencies in the extraction of organic contaminants from soil. Adsorptive behavior of several polycyclic aromatic hydrocarbons (PAHs) from supercritical carbon dioxide (SC CO2) onto sandy loam‐type soil has been characterized. Data for the solubility of phenanthrene, anthracene, triphenylene, and perylene in SC CO2 demonstrates a strong relationship between solubility and the carbon number and angularity of the ring structure. Soil adsorption isotherms for these compounds are non‐linear, and have been described using Freundlich and BET adsorption models. The slope of the adsorption isotherms has been correlated with PAH solubility on log‐log coordinates. Addition of polar modifiers, e.g., water or methanol, dramatically reduces the PAH adsorption levels, indicating the importance of polar adsorption sites on soil surfaces. Copyright © 1990 American Institute of Chemical Engineers (AIChE)

引用

页码：204 / 210

页数：7

共 24 条

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