RT Journal Article
T1 Novel Magnetic Nanostructured Beads for Cadmium(II) Removal
A1 Alves, Lisandra Cristina de Castro
A1 Yáñez Vilar, Susana
A1 Piñeiro Redondo, Yolanda
A1 Rivas Rey, José
K1 Magnetic
K1 Nanoparticles
K1 Alginate
K1 Beads
K1 Adsorption
K1 Cadmium
AB This study presents an effective magnetic separation method for cadmium removal, based on the use of a novel nanostructured material as an adsorbent. This adsorbent involves the incorporation of magnetite nanoparticles (Fe3O4-NPs), synthesized by the reverse coprecipitation method, into sodium alginate and activated carbon to form spherical structures by crosslinking Ca2+ ions with the charged alginate chains, referred to as magnetic alginate activated carbon (MAAC) beads.The effect of the experimental parameters, such as pH, contacting time, adsorbent dosage, agitation type, and rotating speed were investigated and optimized for an efficient removal of Cd(II) ions at an initial concentration of 250 mg/L. The amount of adsorbed Cd(II) by MAAC beads increased at a pH of 6 with a removal efficiency over 90%. The maximum adsorption capacity reached was 70 mg/g of adsorbent at an initial Cd(II) concentration of 150 mg/L, whereas at 250 mg/L the adsorption capacity lowered until 60 mg/g. Sorption isotherms were calculated using Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich equations, and were better described by the Freundlich and Temkin models. These results proved the removal efficiency and the potential use under real environmental conditions of the MAAC beads, due to their easy recovery from contaminated aqueous solutions.
PB MDPI
YR 2019
FD 2019
LK http://hdl.handle.net/10347/21343
UL http://hdl.handle.net/10347/21343
LA eng
NO de Castro Alves, L.; Yáñez-Vilar, S.; Piñeiro-Redondo, Y.; Rivas, J. Novel Magnetic Nanostructured Beads for Cadmium(II) Removal. Nanomaterials 2019, 9, 356
NO This work was supported in part by EP-INTERREG V A (POCTEP) Funds (project NANOEATERS/1378)and the Consellería de Educación Program for Development of a Strategic Grouping in Materials (AEMAT) at theUniversity of Santiago de Compostela under Grant No. ED431E208/08, Xunta de Galicia
DS Minerva
RD 4 may 2026