Oxidation and EDX elemental mapping characterization of an ordered mesoporous carbon: Pb(II) and Cd(II) removal

The adsorption of the metallic ions Cd(II) and Pb(II) onto the surface of the mesoporous activated carbon CMK-3 is presented. The carbon was synthesized from a SBA-15 template by the method of nanocasting and oxidized in an aqueous solution with nitric acid (HNO3). The effect of temperature and oxid...

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Bibliographic Details
Published in:Applied surface science 2014-06, Vol.303, p.373-380
Main Authors: MORENO-TOVAR, R, TERRES, E, RANGEL-MENDEZ, J. Rene
Format: Article
Language:English
Subjects:
Activated carbon
Adsorption
Carbon
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Mapping
Oxidation
Oxygen
Physics
Surface area
Surface chemistry
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Summary:The adsorption of the metallic ions Cd(II) and Pb(II) onto the surface of the mesoporous activated carbon CMK-3 is presented. The carbon was synthesized from a SBA-15 template by the method of nanocasting and oxidized in an aqueous solution with nitric acid (HNO3). The effect of temperature and oxidation time was studied. The presence of the functional groups, formed during the oxidation, onto the carbon surface was confirmed by FT-IR analysis. The structural and textural properties of activated carbon were obtained by nitrogen adsorption, SEM, EDX and HTEM. The surface area of the CMK-3 is 1170m2/g, and it contains 96.7% of carbon and 3.3% of oxygen, whereas the oxidized CMK-3-O exhibits a surface area of 944m2/g and contains 85.2% of carbon and 14.8% of oxygen. The adsorption isotherms follow the Langmuir model and the maximum amount of adsorbed ions was 40.4mg/g for Cd(II) and 94mg/g for Pb(II) at pH 5 and 25 degree C. The spatial distribution and amount of oxygen and adsorbed metal ions were determined by elemental mapping and line scanning EDX. It was confirmed that the amount of oxygen is directly related with the amount of adsorbed ions.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2014.03.008