Issue 10, 2004
From the journal:

Green Chemistry

Supercritical fluid extraction of mixed wastes

Kong-Hwa Chiu,*a   Hwa Kwang Yak,b   Joanna Shaofen Wangc  and  Chien M. Waic  

* Corresponding authors

a Department of Natural Sciences, National Science Council, Taipei, Taiwan, ROC

b Department of Chemistry, ChungYuan Christian University, Chung-Li, Taiwan, ROC

c Department of Chemistry, University of Idaho, Moscow, Idaho 83844, USA

Abstract

This study assesses the feasibility of extraction and separation of uranium and PCBs from contaminated soil samples using a sequential supercritical CO2 extraction method. The contaminated soil was first extracted with neat supercritical CO2 at 150 °C and 200 atm to remove PCBs. Subsequently, complexing agents, tri-n-butylphosphate (TBP) and thenoyltrifluoroacetylacetone (HTTA), were added to remove uranium from the contaminated soils. Using this method, nearly all PCBs were removed, and up to 75% of the uranium in the soil could be removed after multiple extractions. This sequential supercritical fluid extraction method may have a wide range of applications for treating various mixed wastes.

Graphical abstract: Supercritical fluid extraction of mixed wastes

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Article information

DOI
https://doi.org/10.1039/B404542D
Article type
Paper
Submitted
25 Mar 2004
Accepted
01 Jul 2004
First published
24 Sep 2004

Green Chem., 2004,6, 502-506

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Supercritical fluid extraction of mixed wastes

K. Chiu, H. K. Yak, J. S. Wang and C. M. Wai, Green Chem., 2004, 6, 502 DOI: 10.1039/B404542D

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