期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 250, 期 1, 页码 93-98出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1006/jcis.2002.8309
关键词
activated carbons; surface chemistry; surface oxygen groups; FT-IR; XPS
In this work, the influence of KOH activation on the surface, chemistry, of activated carbons (ACs) synthesized from polystyrene-based cation exchangeable resin (PSI) has been investigated. The surface chemistry of ACs has been characterized by using Fourier transformed infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), pH measurement, and Boehm's titration method. As a result, PSI can be successfully converted into ACs with high porosities. The total oxygen content on the ACs studied increases with increasing the KOH-to-PSI ratio. FT-IR and XPS analyses show that the resulting carbons possess a number of oxygen surface functional groups, such as carbonyl, quinone, phenol, ether, and carboxylic acid groups. The highest oxygen content and acid value are observed at a KOH-to-PSI ratio of 4 (KPS-4). However, its PH and surface basicity are higher than those of a KOH-to-PSI ratio of 2 (KPS-2), indicating the formation of basic species' such as quinone and pyrone groups. Although the oxygen-containing groups with basic character exist in the resulting carbons, all the samples are still acidic in character. (C) 2002 Elsevier Science (USA).
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