Novel Thermosensitive Gel Adsorbent for Phosphate Ions

A novel thermosensitive gel adsorbent for phosphate ions was developed and its adsorption/desorption properties were investigated. The gel adsorbent was made by the copolymerization of N-isopropylacrylamide (NIPA) and N-[3-(dimethylamino)propyl]acrylamide (DMAPAA). The adsorbent has a volume phase t...

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Bibliographic Details
Published in:Macromolecular symposia. 2010-09, Vol.295 (1), p.81-87
Main Authors: Gotoh, Takehiko, Tanaka, Kazunari, Arase, Takuya, Sakohara, Shuji
Format: Article
Language:English
Subjects:
Adsorbents
adsorption
Cationic
Copolymerization
Desorption
hydrogel
Ionization
Networks
phosphate ion
Phosphates
thermo-sensitive
Thermosensitive
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Summary:A novel thermosensitive gel adsorbent for phosphate ions was developed and its adsorption/desorption properties were investigated. The gel adsorbent was made by the copolymerization of N-isopropylacrylamide (NIPA) and N-[3-(dimethylamino)propyl]acrylamide (DMAPAA). The adsorbent has a volume phase transition temperature (VPTT), below which it becomes hydrophilic. The tertiary amino groups of DMAPAA were ionized and showed a cationic state when the gel swelled. Phosphate ions were adsorbed onto the ionized tertiary amino groups in the gel network below the VPTT and were desorbed above the VPTT because of the suppression of the ionization of the tertiary amino groups of gel and the shrinkage of the gel.
ISSN:1022-1360
1521-3900
1521-3900
DOI:10.1002/masy.200900064