ie500912k_si_001.pdf (519.57 kB)
New Functionalized Magnetic Materials for As5+ Removal: Adsorbent Regeneration and Reuse
journal contribution
posted on 2014-12-10, 00:00 authored by Juan Saiz, Eugenio Bringas, Inmaculada OrtizThe
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 Fe3+) is analyzed. Desorption with
HCl is concentration dependent with maximum efficacies at 0.25 mol
L–1. Solutions of NaOH 10–3 mol
L–1 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%.