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Residues of supercritical extraction of plant as precursors of carbon adsorbents

Aleksandra Bazan-Woźniak

Abstract

The aim of the doctoral dissertation was to obtain activated carbon adsorbents using the residues of supercritical extraction of plants as precursors, physicochemical characterization of the activated carbons obtained and evaluation of their usefulness as adsorbents of pollutants from gas and liquid phase. The carbon adsorbents obtained show different physicochemical properties depending mainly on the type of precursor and the method of its activation. The activated carbons obtained by physical activation of the residue of supercritical extraction of plants have surface of strongly basic character, rather poorly developed surface area and mesoporous structure. The chemical activation of post-extraction materials leads to microporous activated sorbents of surface area in the range 297 - 1095 m2/g. Moreover, the carbon samples obtained by chemical activation of supercritical extraction of plant products have significantly more acidic groups on their surface. At the next stage of the study the activated carbon sorbents were tested in removal of toxic gases represented by nitrogen(IV) oxide. The activated carbons obtained proved good adsorbents of NO2. Depending on the test conditions their sorption capacities were in the range 2.0 to 155.3 mg NO2/gads Some of the activated carbons were also found effective adsorbents of organic and inorganic pollutants of particle size close to that of methylene blue and iodine molecules, from liquid phase. Moreover, their sorption capacities proved higher than those of the commercial products applied for this purpose.
Record ID
UAMeeaffa52936c42d283bcbe2d06a77a05
Diploma type
Doctor of Philosophy
Author
Title in Polish
Pozostałości po ekstrakcji nadkrytycznej surowców roslinnych jako prekursory adsorbentów węglowych
Title in English
Residues of supercritical extraction of plant as precursors of carbon adsorbents
Language
pol (pl) Polish
Certifying Unit
Faculty of Chemistry (SNŚ/WC/FoC)
Discipline
chemistry / (chemical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.5 chemical sciences
Status
Finished
Defense Date
23-05-2018
Title date
23-05-2018
Supervisor
URL
http://hdl.handle.net/10593/23491 Opening in a new tab
Keywords in English
residue of supercritical extraction, activated carbon, physical activation, chemical activation, adsorption
Abstract in English
The aim of the doctoral dissertation was to obtain activated carbon adsorbents using the residues of supercritical extraction of plants as precursors, physicochemical characterization of the activated carbons obtained and evaluation of their usefulness as adsorbents of pollutants from gas and liquid phase. The carbon adsorbents obtained show different physicochemical properties depending mainly on the type of precursor and the method of its activation. The activated carbons obtained by physical activation of the residue of supercritical extraction of plants have surface of strongly basic character, rather poorly developed surface area and mesoporous structure. The chemical activation of post-extraction materials leads to microporous activated sorbents of surface area in the range 297 - 1095 m2/g. Moreover, the carbon samples obtained by chemical activation of supercritical extraction of plant products have significantly more acidic groups on their surface. At the next stage of the study the activated carbon sorbents were tested in removal of toxic gases represented by nitrogen(IV) oxide. The activated carbons obtained proved good adsorbents of NO2. Depending on the test conditions their sorption capacities were in the range 2.0 to 155.3 mg NO2/gads Some of the activated carbons were also found effective adsorbents of organic and inorganic pollutants of particle size close to that of methylene blue and iodine molecules, from liquid phase. Moreover, their sorption capacities proved higher than those of the commercial products applied for this purpose.
Thesis file
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Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAMeeaffa52936c42d283bcbe2d06a77a05/
URN
urn:amu-prod:UAMeeaffa52936c42d283bcbe2d06a77a05

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