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- Title
Modeling of copper ions adsorption onto oxidative-modified activated carbons.
- Authors
Grishchenko, L. M.; Diyuk, V. E.; Konoplitska, O. P.; Lisnyak, V. V.; Maryichuk, R. T.
- Abstract
In this work, the adsorption of copper ions onto activated carbons that oxidatively modified with H2O2 and HNO3 was studied. The prepared sorbents with the surface area of 275-780m2/g contain 0.53-3.77 mmol/g of oxygen-containing groups. It was found that the oxidized activated carbon effectively adsorbs Cu2+ ions from aqueous solutions. For the most efficient activated carbon-HNO3-30 sorbent, the percentage removal of copper ions from solutions of varying concentration is high. In the concentration range from 1.5 to 6×10-4M of Cu2+, it reaches >55%. At the concentrations lower than 1.5×10-4 M, the expected removal is above 80%. The experimental equilibrium adsorption data were modeled with 2- and 3-parameter isotherms. The analysis of adsorption modeling results accounting for the surface heterogeneity effect was provided. The data fit well to the Dubinin-Radushkevich model. Presumably, the complexation of Cu2+ with oxygen-containing groups passes within micropores. We found the correlation between the sorption capacity for Cu2+ and the concentration of surface groups. The presence of the carboxyl, anhydride, and lactone groups make a major impact on the adsorption.
- Subjects
COPPER ions; ACTIVATED carbon; CARBOXYLATE derivatives; ANHYDRIDE analysis; MICROPORES
- Publication
Adsorption Science & Technology, 2017, Vol 35, Issue 9/10, p884
- ISSN
0263-6174
- Publication type
Article
- DOI
10.1177/0263617417729236