TY - JOUR
T1 - Carboxymethylcellulose-based zwitterionic cryogels for efficient U(VI) extraction from water
AU - Zhang, Xu
AU - Zhang, Dongxiang
AU - Li, Dagang
AU - Chen, Shusen
AU - Zhang, Fengqi
AU - Zhang, Zilei
AU - Tan, Haocun
AU - Yang, Le
AU - Hou, Jinzheng
AU - Tan, Runchao
AU - Li, Jinying
AU - Xu, Xiyan
N1 - Publisher Copyright:
© 2024 Elsevier B.V.
PY - 2024/10/30
Y1 - 2024/10/30
N2 - Carboxymethylcellulose-based zwitterionic cryogels (AO-PAM/CMC) with a supermacroporous pore structure were prepared through cryo-polymerization and post-modification strategies. The hydrogel exhibited a supermacroporous structure, excellent hydrophilicity, superior mechanical properties, and resistance to biological contamination. Through a comprehensive investigation of the U(VI) adsorption process, it was observed that the AO-PAM/CMC hydrogel was predominantly characterized by chemisorption, wherein uranyl ions were adsorbed on the surface in the form of a monolayer. Under the conditions of 45 °C and pH = 5.0, the hydrogel demonstrated remarkable adsorption performance, with the maximum adsorption capacity reaching 1223.6 mg∙g−1, showcasing a high degree of selectivity for U(VI). In real seawater, the hydrogel's adsorption capacity for uranium reached 12.95 mg∙g−1 after 25 days of exposure, with the adsorption equilibrium being essentially reached in about 10 days. The adsorption mechanism of U(VI) by the hydrogel was confirmed through XPS spectroscopy and DFT calculations. The synergistic interplay between guanidino and zwitterionic moieties within the AO-PAM/CMC hydrogel enhanced U(VI) adsorption capacity and facilitated rapid uranium extraction from seawater. (UES). Therefore, the AO-PAM/CMC hydrogel presents a novel solution to address the inefficiencies of existing technologies for uranium extraction from seawater, contributing an innovative approach to the sustain-able development of nuclear energy.
AB - Carboxymethylcellulose-based zwitterionic cryogels (AO-PAM/CMC) with a supermacroporous pore structure were prepared through cryo-polymerization and post-modification strategies. The hydrogel exhibited a supermacroporous structure, excellent hydrophilicity, superior mechanical properties, and resistance to biological contamination. Through a comprehensive investigation of the U(VI) adsorption process, it was observed that the AO-PAM/CMC hydrogel was predominantly characterized by chemisorption, wherein uranyl ions were adsorbed on the surface in the form of a monolayer. Under the conditions of 45 °C and pH = 5.0, the hydrogel demonstrated remarkable adsorption performance, with the maximum adsorption capacity reaching 1223.6 mg∙g−1, showcasing a high degree of selectivity for U(VI). In real seawater, the hydrogel's adsorption capacity for uranium reached 12.95 mg∙g−1 after 25 days of exposure, with the adsorption equilibrium being essentially reached in about 10 days. The adsorption mechanism of U(VI) by the hydrogel was confirmed through XPS spectroscopy and DFT calculations. The synergistic interplay between guanidino and zwitterionic moieties within the AO-PAM/CMC hydrogel enhanced U(VI) adsorption capacity and facilitated rapid uranium extraction from seawater. (UES). Therefore, the AO-PAM/CMC hydrogel presents a novel solution to address the inefficiencies of existing technologies for uranium extraction from seawater, contributing an innovative approach to the sustain-able development of nuclear energy.
KW - Amidoxime
KW - Carboxymethylcellulose
KW - Cryo-polymerization
KW - Guanidine
KW - Uranium extraction from seawater
KW - Zwitterionic
UR - http://www.scopus.com/inward/record.url?scp=85190325047&partnerID=8YFLogxK
U2 - 10.1016/j.seppur.2024.127485
DO - 10.1016/j.seppur.2024.127485
M3 - Article
AN - SCOPUS:85190325047
SN - 1383-5866
VL - 346
JO - Separation and Purification Technology
JF - Separation and Purification Technology
M1 - 127485
ER -