SUPERCRITICAL CARBON-DIOXIDE EXTRACTION OF ORGANICS FROM SOIL

被引：77

作者：

ERKEY, C ^{[1
]}

MADRAS, G ^{[1
]}

OREJUELA, M ^{[1
]}

AKGERMAN, A ^{[1
]}

机构：

[1] TEXAS A&M UNIV SYST,DEPT CHEM ENGN,COLL STN,TX 77843

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 1993年 / 27卷 / 06期

关键词：

D O I：

10.1021/es00043a025

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The adsorption isotherms for naphthalene, phenanthrene, hexachlorobenzene, and pentachlorophenol on soil were determined in the presence Of liquid and supercritical carbon dioxide. The adsorption isotherms for naphthalene, phenanthrene, and hexachlorobenzene are linear, whereas for pentachlorophenol, a slight deviation from linearity was observed. The heats of adsorption of naphthalene, phenanthrene, hexachlorobenzene, and pentachlorophenol on soil at 308 K were found to be in the range of 1-5 kcal/mol, indicating physical adsorption. The desorptive behavior of these organics from soil using supercritical carbon dioxide was also investigated, and local equilibrium theory was found to predict the desorption profiles fairly accurately.

引用

页码：1225 / 1231

页数：7

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