posted on 2020-03-09, 11:03authored byYoung
Jin Gwon, Jeong Jun Lee, Kune-Woo Lee, Mark D. Ogden, Laurence M. Harwood, Taek Seung Lee
We prepared Prussian blue (PB) nanoparticles
immobilized on the
surface of nanofibers to adsorb the Cs ions effectively. The nanofibers
were fabricated by electrospinning of polyacrylonitrile (PAN), and
polydopamine (PD) was polymerized to immobilize PB on the surfaces
of the nanofibers. PD is known to adhere easily on any substrate,
and it could coat the surface of the PAN nanofibers. The catechol
groups in PD could also bind to Fe(III) and Fe(II) ions, and subsequently,
the Fe ions reacted further to form PB nanoparticles, in which PB
was located on the surface of PAN nanofibers. The colloidal PB nanoparticles
were immobilized on the substrate, and thus they could be easily separated
from the metal mixture after Cs ion adsorption. The adsorption isotherm
and kinetics of the nanofibrous adsorbent were investigated, indicating
monolayer chemisorption of the Langmuir type. The PB-modified nanofibers
were stable and the removal efficiency for Cs ions was not varied
after five times of regeneration.