期刊
APPLIED SURFACE SCIENCE
卷 286, 期 -, 页码 351-357出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2013.09.085
关键词
Activated carbon; Surface chemistry; Functional groups; Immersion enthalpy; Ni(II) ions
类别
资金
- Universidad Nacional [DIB 16021]
- Seed Project of the Faculty of Science of the Universidad de los Andes
This study investigated Ni(II) ion adsorption from aqueous solution on activated carbons obtained by chemically modifying the surface with the oxidizing agents nitric acid and hydrogen peroxide (CAGoxP and CAGoxN, respectively). The activated carbons were characterized by total acidity and basicity, pH at the point of charge zero determination and IR spectroscopy. Textural parameters such as the BET area and pore volumes were evaluated by gas adsorption. The BET area of the materials was between 816 and 876 m(2) g(-1). Additionally, the immersion enthalpies of the activated carbons in water and benzene were determined. The experimental results on adsorption in solution were adjusted to the Langmuir and Freundlich models, obtaining values for the monolayer capacity between 29.68 and 50.97 mg g(-1), which indicates that the adsorption capacity depends largely on solid surface chemistry. (C) 2013 Elsevier B.V. All rights reserved.
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