TY - JOUR
T1 - Photo-swing extraction system for lanthanide separation by a thermosensitive polymer gel combined with carbon nanotubes
AU - Nishihama, Syouhei
AU - Ohsawa, Kayo
AU - Yamada, Yasushi
AU - Yoshizuka, Kazuharu
AU - Fujigaya, Tsuyohiko
AU - Nakashima, Naotoshi
N1 - Funding Information:
This work was supported in part by the Nanotechnology Network Project, which is implemented by the Ministry of Education, Culture, Sports, Science, and Technology (MEXT).
PY - 2012/2
Y1 - 2012/2
N2 - A novel photo-swing extraction system for lanthanide separation was developed using an acid phosphoxy ethyl methacrylate (Phosmer-M) copolymerized thermosensitive polymer gel and N-isopropylacrylamide (NIPAM) combined with single-walled carbon nanotubes (CNTs) as the extracting material. The swelling and shrinking phase transition of the Phosmer-M/NIPAM/CNT gel was successfully induced by photo-irradiation with a halogen lamp because of the heat generation by the CNTs, which occurred upon visible light absorption. The extraction ability of Eu(III) increased upon photo-irradiation because of changes in the volume and hydrophobicity of the composite gel. The ratio of the distribution coefficient with and without photo-irradiation (K dphoto/K d25) increased with an increase in the pH. The composite gel possessed sufficient loading and release capacities for Eu(III), La(III) and Lu(III) in repeated processes after photo-irradiation. The selectivity for Eu(III) over La(III) in binary metal systems increased due to photo-irradiation because the observed improvement in the extraction of Eu(III) was greater than that of La(III) during the phase transition of the gel.
AB - A novel photo-swing extraction system for lanthanide separation was developed using an acid phosphoxy ethyl methacrylate (Phosmer-M) copolymerized thermosensitive polymer gel and N-isopropylacrylamide (NIPAM) combined with single-walled carbon nanotubes (CNTs) as the extracting material. The swelling and shrinking phase transition of the Phosmer-M/NIPAM/CNT gel was successfully induced by photo-irradiation with a halogen lamp because of the heat generation by the CNTs, which occurred upon visible light absorption. The extraction ability of Eu(III) increased upon photo-irradiation because of changes in the volume and hydrophobicity of the composite gel. The ratio of the distribution coefficient with and without photo-irradiation (K dphoto/K d25) increased with an increase in the pH. The composite gel possessed sufficient loading and release capacities for Eu(III), La(III) and Lu(III) in repeated processes after photo-irradiation. The selectivity for Eu(III) over La(III) in binary metal systems increased due to photo-irradiation because the observed improvement in the extraction of Eu(III) was greater than that of La(III) during the phase transition of the gel.
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U2 - 10.1016/j.reactfunctpolym.2011.12.001
DO - 10.1016/j.reactfunctpolym.2011.12.001
M3 - Article
AN - SCOPUS:84855174418
SN - 1381-5148
VL - 72
SP - 142
EP - 147
JO - Reactive and Functional Polymers
JF - Reactive and Functional Polymers
IS - 2
ER -