期刊
APPLIED SURFACE SCIENCE
卷 258, 期 20, 页码 8247-8252出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2012.05.029
关键词
Activated carbon; Chemical treatment; Surface oxygen complexes; Characterization; Adsorption mechanism
类别
资金
- projects in Forestry Public Benefit Research Sector [201004051]
- National Science& Technology Pillar Program in the eleventh five-year plan period [2009BADB1B03]
A coconut activated carbon was modified using chemical methods. Different concentration of nitric acid oxidation of the conventional sample produced samples with weakly acidic functional groups. The oxidized samples were characterized by scanning electron micrograph, nitrogen absorption-desorption, Fourier transform infra red spectroscopy, Bothem method, pH titration, adsorption capacity of sodium and formaldehyde, and the adsorption mechanism of activated carbons was investigated. The results showed that BET surface area and pore volume of activated carbons were decreased after oxidization process, while acidic functional groups were increased. The surface morphology of oxidized carbons looked clean and eroded which was caused by oxidization of nitric acid. The oxidized carbons showed high adsorption capacity of sodium and formaldehyde, and chemical properties of activated carbon played an important role in adsorption of metal ions and organic pollutants. (C) 2012 Elsevier B.V. All rights reserved.
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