RT Journal Article
T1 Understanding adsorption mechanisms and metal ion selectivity of superparamagnetic beads with mesoporous CMK-3 carbon and commercial activated carbon
A1 Alves, Lisandra Cristina de Castro
A1 Yáñez Vilar, Susana
A1 González Gómez, Manuel Antonio
A1 García Acevedo, Pelayo
A1 Arnosa Prieto, Ángela
A1 Piñeiro Redondo, Yolanda
A1 Rivas Rey, José
K1 Heavy metals
K1 Adsorption
K1 Sodium alginate
K1 Multimetal
K1 Water
K1 CMK-3 mesoporous carbon
AB This study investigates, the adsorption capacities of synthesized magnetic hybrid beads containing ordered mesoporous carbon (CMK-3) and commercial activated carbon (commercial AC) for Cd (II), Ni (II), and Hg (II) ions adsorption in single and ternary systems. The order of maximum adsorption capacity was Cd (II) > Ni (II) > Hg (II) in both beads and systems. L13 beads containing CMK-3 exhibit superior adsorption efficiency compared to L3 beads with commercial AC, attributed to the large surface area, enhanced accessibility to adsorption sites, and the presence of O=C bonds, as well as other elements such as F−. Adsorption of all metal ions was described by Freundlich isotherm in L3 beads in both systems, meanwhile in L13 beads, Langmuir and Freundlich models described adsorption differently in both systems and among metal ions, indicating a more complex process. According to the reported maximum adsorption capacity values, L3 beads exhibit a greater affinity for Hg (II) ions, while L13 beads show a higher affinity for Cd (II) and Ni (II) ions. Adsorption in both beads occurred through several mechanisms involving surface complexation, ion-exchange, precipitation, physical and chemical processes. These findings highlight the importance of material design in optimizing adsorption performance for environmental applications, with potential for further enhancement of adsorption capacities and selectivities through future research.
PB Elsevier
SN 1387-1811
YR 2024
FD 2024
LK http://hdl.handle.net/10347/34651
UL http://hdl.handle.net/10347/34651
LA eng
NO Microporous and Mesoporous Materials Volume 374 , 15 June 2024, 113159
NO The research leading to these results has received funding mainly from grant PID2020-112626RB-C21 funded by MCIN/AEI/10.13039/501100011033, modalities « Research Challenges» and «Knowledge Generation».
DS Minerva
RD 29 abr 2026