abstract

• The adsorption mechanism of Ni(II) and Zn(II) onto activated carbon fiber (ACF) cloth and felt plain and oxidized was investigated in this work. The adsorption equilibrium data were obtained in a batch adsorber. The concentration of acidic and basic sites on the ACFS was determined by an acid-base titration method. The experimental adsorption equilibrium data were interpreted with the Redlich-Peterson isotherm, which fitted the data reasonably well. The ACF was oxidized with HNO3 solution and the concentration of acidic sites increased during oxidation, whereas that of the basic sites diminished. The adsorption capacity of the oxidized ACF was higher than that of the plain ACF because the oxidation of ACF formed more acidic sites on the surface where the metal cations can be adsorbed. The adsorption capacity of the plain and oxidized ACFs was linearly dependent upon the concentration of carboxylic sites. The adsorption of Ni(II) and Zn(II) on the ACFs was due to both electrostatic interactions and cation-π interactions. The contribution of ion exchange to the overall adsorption of Zn(II) and Ni(II) on ACFs was less than 3.3 %25 and can be considered negligible. © 2013 Springer Science Business Media Dordrecht.
• The adsorption mechanism of Ni(II) and Zn(II) onto activated carbon fiber (ACF) cloth and felt plain and oxidized was investigated in this work. The adsorption equilibrium data were obtained in a batch adsorber. The concentration of acidic and basic sites on the ACFS was determined by an acid-base titration method. The experimental adsorption equilibrium data were interpreted with the Redlich-Peterson isotherm, which fitted the data reasonably well. The ACF was oxidized with HNO3 solution and the concentration of acidic sites increased during oxidation, whereas that of the basic sites diminished. The adsorption capacity of the oxidized ACF was higher than that of the plain ACF because the oxidation of ACF formed more acidic sites on the surface where the metal cations can be adsorbed. The adsorption capacity of the plain and oxidized ACFs was linearly dependent upon the concentration of carboxylic sites. The adsorption of Ni(II) and Zn(II) on the ACFs was due to both electrostatic interactions and cation-π interactions. The contribution of ion exchange to the overall adsorption of Zn(II) and Ni(II) on ACFs was less than 3.3 %25 and can be considered negligible. © 2013 Springer Science%2bBusiness Media Dordrecht.

authors

• Berber Mendoza María Selene
• Cerino-Cordoba F.J.
• Flores-Cano J.V.
• Garcia H.J.A.
• Leyva Ramos Roberto
• Mendoza‐Barron J.

publication date

• 2013-01-01

published in

• Water, Air, and Soil Pollution  Journal

keywords

• Activated carbon fibers; Adsorption; Carboxylic sites; Ni(II); Zn(II) Activated carbon; Adsorption; Adsorption isotherms; Carbon fibers; Ion exchange; Oxidation; Positive ions; Titration; Zinc compounds; Acid-base titration; Acidic sites; Adsorption capacities; Adsorption equilibria; Adsorption mechanism; Carboxylic sites; Cation-pi interactions; Redlich-Peterson isotherms; Nickel compounds; activated carbon; carbon fiber; carboxylic acid; lactone; nickel; phenol; zinc ion; activated carbon; adsorption; carboxylic acid; ion exchange; nickel; oxidation; zinc; acid base balance; adsorption kinetics; article; concentration (parameters); desorption; intermethod comparison; isotherm; mathematical model; oxidation; physical chemistry; static electricity; surface property; waste component removal; water contamination

Digital Object Identifier (DOI)

• 10.1007/s11270-013-1604-3

start page

end page

volume

• 224

issue

• 7