Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry
Thermal treatment of oxidised active carbon under vacuum conditions led to changes in the chemical nature of its surface, e.g. a stepwise decrease in the total oxygen content and an increase in the pH of the carbon slurry. Annealing reduced the number of surface oxygen-containing groups and increase...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2002-07-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/026361702321039519 |
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| author | M. Pakuła S. Biniak A. Świątkowski |
| author_facet | M. Pakuła S. Biniak A. Świątkowski |
| author_sort | M. Pakuła |
| collection | DOAJ |
| description | Thermal treatment of oxidised active carbon under vacuum conditions led to changes in the chemical nature of its surface, e.g. a stepwise decrease in the total oxygen content and an increase in the pH of the carbon slurry. Annealing reduced the number of surface oxygen-containing groups and increased the overall number of basic groups. The results of the cyclic voltammetric studies analysed in this paper clearly indicate only a weak relationship between the presence and number of cathodic/anodic peaks, i.e. reduction/oxidation of electroactive surface groups, forming during cyclisation and the degree of surface oxidation (regulated by heat treatment) of the carbon samples tested. The electrochemical behaviour of powdered carbon suggested electro-oxidation of the surface of the electrode material with participation of adsorbed hydroxy ions and water molecules. The possible electrochemical reactions and mechanisms of the surface processes were discussed in order to explain the observed phenomena. |
| format | Article |
| id | doaj-art-6309b30e693b441886474b2a90a00117 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2002-07-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-6309b30e693b441886474b2a90a001172025-02-03T10:07:41ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382002-07-012010.1260/026361702321039519Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface ChemistryM. Pakuła0S. Biniak1A. Świątkowski2 Naval Academy, 81-103 Gdynia, Poland Faculty of Chemistry, Nicolaus Copernicus University, ul. Gagarina 7, 87-100 Toruń, Poland Institute of Chemistry, Military Technical Academy, ul. Kaliska 2, 00-908 Warsaw, PolandThermal treatment of oxidised active carbon under vacuum conditions led to changes in the chemical nature of its surface, e.g. a stepwise decrease in the total oxygen content and an increase in the pH of the carbon slurry. Annealing reduced the number of surface oxygen-containing groups and increased the overall number of basic groups. The results of the cyclic voltammetric studies analysed in this paper clearly indicate only a weak relationship between the presence and number of cathodic/anodic peaks, i.e. reduction/oxidation of electroactive surface groups, forming during cyclisation and the degree of surface oxidation (regulated by heat treatment) of the carbon samples tested. The electrochemical behaviour of powdered carbon suggested electro-oxidation of the surface of the electrode material with participation of adsorbed hydroxy ions and water molecules. The possible electrochemical reactions and mechanisms of the surface processes were discussed in order to explain the observed phenomena.https://doi.org/10.1260/026361702321039519 |
| spellingShingle | M. Pakuła S. Biniak A. Świątkowski Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry Adsorption Science & Technology |
| title | Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry |
| title_full | Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry |
| title_fullStr | Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry |
| title_full_unstemmed | Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry |
| title_short | Changes in the Surface Chemistry and Adsorptive Properties of Active Carbon Previously Oxidised and Heat-Treated at Various Temperatures. II. Electrochemical Investigations of Surface Chemistry |
| title_sort | changes in the surface chemistry and adsorptive properties of active carbon previously oxidised and heat treated at various temperatures ii electrochemical investigations of surface chemistry |
| url | https://doi.org/10.1260/026361702321039519 |
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