Adsorption of arsenate on iron(III) oxide coated ethylenediamine functionalized multiwall carbon nanotubes

[Display omitted] ► Iron(III)-oxide loaded e-MWCNT shows good sorption affinity for arsenic(V). ► The sorption pattern of As(V) fits well to the Freundlich model. ► As(V) adsorption is dependent to iron(III)-oxide content, pH and temperature. ► The sorption of As(V) and As(III) is a rather complex a...

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Published in:Chemical engineering journal (Lausanne, Switzerland : 1996) Switzerland : 1996), 2012-02, Vol.181-182, p.174-181
Main Authors: Veličković, Zlate, Vuković, Goran D., Marinković, Aleksandar D., Moldovan, Maria-Simona, Perić-Grujić, Aleksandra A., Uskoković, Petar S., Ristić, Mirjana Đ.
Format: Article
Language:English
Subjects:
adsorbents
Adsorption
Amidation
Arsenic
carbon nanotubes
chemical engineering
Chemical Sciences
drinking water
goethite
ions
iron
Iron(III) oxide
Material chemistry
Multiwall carbon nanotubes
new technology
sorption isotherms
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Summary:[Display omitted] ► Iron(III)-oxide loaded e-MWCNT shows good sorption affinity for arsenic(V). ► The sorption pattern of As(V) fits well to the Freundlich model. ► As(V) adsorption is dependent to iron(III)-oxide content, pH and temperature. ► The sorption of As(V) and As(III) is a rather complex and spontaneous process. ► Creation of inner-sphere surface complexes are main sorption mechanisms. New criteria in assessing the quality of drinking water reduced the maximum permissible concentration of arsenic from 50μgL−1 to 10μgL−1, and set a requirement for the development of new technologies for arsenic removal. In this paper, ethylenediamine functionalized multiwall carbon nanotubes (e-MWCNT) were loaded with iron(III) oxide in the goethite form, by precipitation of adsorbed Fe3+ and oxidized Fe2+ using base, in that way e-MWCNT/Fe3+ and e-MWCNT/Fe2+ adsorbents, respectively, were obtained. The influence of pH on the As(V) and As(III) removal from drinking water was studied in a batch system, of pH range 3–10 and initial arsenic concentration 0.05–4mgL−1. Time dependent As(V) adsorption and adsorption data can be described by pseudo-second-order kinetic model and by Freundlich isotherm, applying linear and non-linear fitting methods. The maximum adsorption capacities obtained from Langmuir model for As(V) on e-MWCNT/Fe2+ and e-MWCNT/Fe3+ were 23.47 and 13.74mgg−1 at 25°C, respectively. Thermodynamic parameters showed that the adsorption of As(V) was spontaneous and endothermic for both e-MWCNT/Fe2+ and e-MWCNT/Fe3+. Influences of the pH, iron(III) oxide loading and interfering ions were modeled by MINTEQ program, and good agreement between experimental and modeling data was obtained.
ISSN:1385-8947
1873-3212
DOI:10.1016/j.cej.2011.11.052