NDLI: Adsorption Behavior of Dioxin Model Compounds on Activated Carbon in Supercritical Carbon Dioxide

Content Provider	Springer Nature Link
Author	Goto, Motobu Sasaki, Mitsuru Kawahara, Shiho Hirose, Tsutomu
Copyright Year	2005
Abstract	Removal of toxic substances such as dioxins and PCBs in the environmental matrices such as fly ash and soil is becoming important. We have been developing combined process of extraction with supercritical carbon dioxide, concentration by adsorption, and then destruction by supercritical water oxidation as a national project (NEDO/Energy Conservation Center). In the extraction—adsorption process, dioxins contained in solid samples can be transferred and concentrated into adsorbent. Then, the adsorbent containing dioxins is completely destructed by supercritical water oxidation. For supercritical CO2 extraction and supercritical water oxidation, efficiencies of more than 99% were achieved. In this work, we studied the adsorption of model compounds of dioxins onto activated carbon in supercritical carbon dioxide to obtain the design data for the process. The adsorption behavior of dioxins model compounds was measured by impulse or step response technique in supercritical CO2 in the pressure range of 10–40 MPa at 323 K. As the model compounds, we used benzene, monochlorobenzene, dichlorobenzene, biphenyl, and anthracene to evaluate the effect molecular weight and the presence of chlorine in the molecule. By using the step response technique, we obtained the amount adsorbed on activated carbon. Adsorption decreased as molecular weight increased, but was not affected by pressure. The adsorbed amount was not significantly influenced by the pressure. This result suggests that these components can be effectively adsorbed on activated carbon in supercritical CO2. We have also measured impulse response to evaluate the adsorption equilibrium constant. Analysis based on the molecular shape and the size is applied to evaluate the adsorption behavior.
Starting Page	157
Ending Page	161
Page Count	5
File Format	PDF
ISSN	09295607
Journal	Adsorption
Volume Number	11
Issue Number	1
e-ISSN	15728757
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2005-01-01
Publisher Place	Boston
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	dioxin supercritical carbon dioxide step response impulse response Industrial Chemistry/Chemical Engineering Engineering Thermodynamics, Transport Phenomena Surfaces and Interfaces, Thin Films
Content Type	Text
Resource Type	Article
Subject	Chemistry Chemical Engineering Surfaces and Interfaces

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