Effect of Some Oxidation Treatments on the Textural Characteristics and Surface Chemical Nature of an Activated Carbon

The changes produced in an activated carbon by treatment in aqueous solutions of (NH4)2S2O8 and H2O2 are compared with the modifications produced by oxygen plasma. These changes are monitored by measuring the textural characteristics (surface areas, porosity, pore size distributions) and surface che...

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Bibliographic Details
Published in:Journal of colloid and interface science 2000-02, Vol.222 (2), p.233-240
Main Authors: Domingo-García, M., López-Garzón, F.J., Pérez-Mendoza, M.
Format: Article
Language:English
Subjects:
ACTIVATED CARBON
Adsorbents
AMMONIUM SULFATES
chemical groups
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
HYDROGEN PEROXIDE
MATERIALS SCIENCE
OXIDATION
OXYGEN
PORE STRUCTURE
porosity
Porous materials
surface
Surface physical chemistry
SURFACE PROPERTIES
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Summary:The changes produced in an activated carbon by treatment in aqueous solutions of (NH4)2S2O8 and H2O2 are compared with the modifications produced by oxygen plasma. These changes are monitored by measuring the textural characteristics (surface areas, porosity, pore size distributions) and surface chemical groups. The former are studied by N2 and CO2 adsorption, mercury porosimetry and hydrocarbon adsorption at zero surface coverage. The chemical surface groups are determined by chemical titrations and FTIR Spectroscopy. The results show large differences between the changes produced by treatment in aqueous solutions and those produced by oxygen plasma. Whereas both treatments in aqueous solution modify the textural characteristics, oxygen plasma maintains the surface area and pore network. However, plasma treatment introduces larger amounts of oxygen chemical groups than treatment in aqueous solution.
ISSN:0021-9797
1095-7103
DOI:10.1006/jcis.1999.6619