TY - JOUR
T1 - Lanthanides adsorption on metal-organic framework
T2 - Experimental insight and spectroscopic evidence
AU - Paz, Roxana
AU - Gupta, Nishesh Kumar
AU - Viltres, Herlys
AU - Leyva, Carolina
AU - Romero-Galarza, Adolfo
AU - Srinivasan, Seshasai
AU - Rajabzadeh, Amin Reza
N1 - Publisher Copyright:
© 2022 Elsevier B.V.
PY - 2022/10/1
Y1 - 2022/10/1
N2 - Herein, lanthanides (Samarium: Sm, Lanthanum: La, and Erbium: Er) adsorption mechanism over copper trimesate metal-organic framework (Cu-BTC MOF) was studied. The MOF crystallized as [Cu(HBTC)(H2O)3] and [Cu3(BTC)2] with a rod-like structure and abundant free –COOH groups. The Langmuir adsorption capacity of 1007.1, 656.5, and 410.5 mg g−1 was recorded for Sm, La, and Er, respectively. The adsorption process was driven by rapid ion exchange with crystal structure transformation in the first hour of mixing, mediated by the surface ion-exchange phenomenon and free –COOH groups. After 1 h, the process was driven by a slow ion-exchange mechanism where Ln ions drifted internally, and Cu ions moved out towards the surface. Among the three lanthanides studied, Er/Cu-BTC system was more sensitive to structural reorganization with the increasing Ln/Cu ratio. The work reported here is one of the first detailed accounts of the Ln-adsorption process in MOFs.
AB - Herein, lanthanides (Samarium: Sm, Lanthanum: La, and Erbium: Er) adsorption mechanism over copper trimesate metal-organic framework (Cu-BTC MOF) was studied. The MOF crystallized as [Cu(HBTC)(H2O)3] and [Cu3(BTC)2] with a rod-like structure and abundant free –COOH groups. The Langmuir adsorption capacity of 1007.1, 656.5, and 410.5 mg g−1 was recorded for Sm, La, and Er, respectively. The adsorption process was driven by rapid ion exchange with crystal structure transformation in the first hour of mixing, mediated by the surface ion-exchange phenomenon and free –COOH groups. After 1 h, the process was driven by a slow ion-exchange mechanism where Ln ions drifted internally, and Cu ions moved out towards the surface. Among the three lanthanides studied, Er/Cu-BTC system was more sensitive to structural reorganization with the increasing Ln/Cu ratio. The work reported here is one of the first detailed accounts of the Ln-adsorption process in MOFs.
KW - Cu-BTC
KW - Ion-exchange
KW - Lanthanides
KW - Mechanism
KW - Spectroscopy
UR - http://www.scopus.com/inward/record.url?scp=85133372123&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2022.121606
DO - 10.1016/j.seppur.2022.121606
M3 - Artículo
AN - SCOPUS:85133372123
SN - 1383-5866
VL - 298
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 121606
ER -