Boehm Titration Revisited (Part II): A Comparison of Boehm Titration with Other Analytical Techniques on the Quantification of Oxygen-Containing Surface Groups for a Variety of Carbon Materials

The use of the Boehm titration (BT) method as an analytical tool for the quantification of oxygen-containing surface groups is systematically investigated for oxidized carbon black, carbon nanotubes and two active carbons with specific surface areas between 60 and 1750 m2 g−1. The accuracy of the BT...

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Bibliographic Details
Published inC (Basel) Vol. 4; no. 2; p. 22
Main Authors Schönherr, Jan, Buchheim, Johannes R., Scholz, Peter, Adelhelm, Philipp
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.06.2018
Subjects
Boehm titration
Carbon
Carbon black
carbon materials
Carbon nanotubes
Chemistry
Methods
Morphology
Oxygen
Oxygen content
oxygen-containing groups
Phenols
Quantitative analysis
Sampling methods
Titration
validation
X ray photoelectron spectroscopy
X ray spectra
Germany
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Summary:The use of the Boehm titration (BT) method as an analytical tool for the quantification of oxygen-containing surface groups is systematically investigated for oxidized carbon black, carbon nanotubes and two active carbons with specific surface areas between 60 and 1750 m2 g−1. The accuracy of the BT method is quantitatively compared with results from elemental analysis (EA), temperature programmed desorption (TPD), and X-ray photoelectron spectroscopy (XPS). Overall, the results from TPD are in line with the values obtained by BT. Both show the equal ratio of the oxygen groups to each other. Within the series of carbon samples, all methods provide similar trends for the total oxygen content yet the absolute numbers are deviating significantly. Reasons for these discrepancies are discussed and linked to the specific characteristics of the different methods. As the BT method is a solution based method, it only probes the surface fraction of the carbon that is accessible to the base solution. That means, it probes the relevant fraction for applications where carbon is in contact to aqueous solutions. Overall, the BT method can be conveniently applied to a broad range of carbon materials as long as the samples are sufficiently hydrophilic and of the enough sample amount is provided.
ISSN:2311-5629
2311-5629
DOI:10.3390/c4020022