New criteria in assessing the quality of drinking water reduced the maximum permissible concentration
of arsenic from 50 g L−1 to 10 g L−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 0.05–4 mg L−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 13.74 mg g−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.
New criteria in assessing the quality of drinking water reduced the maximum permissible concentration
of arsenic from 50 g L−1 to 10 g L−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 0.05–4 mg L−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 13.74 mg g−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.
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