Alteration of Chemical Structure of the Active Vegetal Coals

Nastas, Raisa; Rusu, Vasile; Giurginca, Maria; Meghea, Aurelia; Lupascu, Tudor

Raisa Nastas, Vasile Rusu, Maria Giurginca, Aurelia Meghea, Tudor Lupascu

Alteration of Chemical Structure of the Active Vegetal Coals

Abstract:

The peculiarities of surface chemistry, functional groups and acid-basic properties of activated carbons obtained from vegetal raw materials by different methods of activation have been emphasized. Active carbons obtained from peach and plum stones by physical-chemical activation (with steam, aqueous solutions of sulfurous anhydride or ammonia) possess predominantly basic functional groups on the surface, although acidic sites in minor quantities are also accumulated. FTIR spectra suggest the presence on the surface of these carbons of alcoholic and phenolic groups, quinones and hydroxy-ketones. Active carbons obtained from plum stones, nut shells and grape seeds by chemical activation with phosphoric acid possess predominantly acidic functional groups on the surface, out of which carboxylic groups are prevailing by 2-3 times the content of phenolic structures. FTIR spectra suggest the presence on the surface of these carbons of a series of organic structures including carboxylic acids, ketones, aldehydes, quinones, lactones and esters, also alcohols and phenols. UV-VIS-NIR spectra also indicate the presence of alcohols and phenols on the surface of these carbons.

Keywords:
active carbons; surface chemistry; electrochemical titration; spectral analyses

Issue: 2008, Volume 59, Issue 2

Pages: 159-164

Publication date: 2008/3/9

https://doi.org/10.37358/RC.08.2.1725

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This article is published under the Creative Commons Attribution 4.0 International License

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