10.1021/ie500912k.s001
Juan Saiz
Juan
Saiz
Eugenio Bringas
Eugenio
Bringas
Inmaculada Ortiz
Inmaculada
Ortiz
New Functionalized
Magnetic Materials for As<sup>5+</sup> Removal: Adsorbent Regeneration
and Reuse
American Chemical Society
2014
sorbent refunctionalization steps
desorption
mol
M 3 materials
NaOH
F 1
HCl
regeneration
arsenic
concentration
adsorption
efficacie
arsenate
Functionalized
2014-12-10 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/New_Functionalized_Magnetic_Materials_for_As_sup_5_sup_Removal_Adsorbent_Regeneration_and_Reuse/2226520
The
presence of arsenic in natural water is one of the most important
pollution problems worldwide. Functionalized magnetic silica/magnetite
nanoparticles (M3) have been reported as effective materials for arsenate
adsorption [Saiz et al., 2014]. Because the process economy might
be limited by the solid reuse, this work aims at the analysis of the
regeneration and reusability of arsenate loaded M3 materials. The
influence on the desorption and readsorption efficacies of the type
and concentration of the regeneration agent, HCl or NaOH, and the
sorbent refunctionalization steps (F1 is protonation of amino groups,
F2 is coordination of Fe<sup>3+</sup>) is analyzed. Desorption with
HCl is concentration dependent with maximum efficacies at 0.25 mol
L<sup>–1</sup>. Solutions of NaOH 10<sup>–3</sup> mol
L<sup>–1</sup> provided the best desorption performance; however,
the regeneration of the solid needed of two stages of refunctionalization
(F1 and F2). Furthermore, regenerated materials under alkaline conditions
reported adsorption yields of arsenic around 90%.