Thermo-responsive extraction of cadmium(II) ion with poly(TPEN-NIPA) gel. Effect of the chain length and branch in the spacer structure towards gel formation and the extracting behavior
Thermo-responsive extraction of cadmium(II) ion with poly(TPEN-NIPA) gel. Effect of the chain length and branch in the spacer structure towards gel formation and the extracting behavior
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发表时间：
2018
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通讯作者：
Yusuke Inaba;T. Tsumagari;T. Kida;Wataru Watanabe;Y. Nakajima;Sachio Fukuoka;A. Mori;T. Matsumura;Y. Nakano;K. Takeshita
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作者：
Yusuke Inaba;T. Tsumagari;T. Kida;Wataru Watanabe;Y. Nakajima;Sachio Fukuoka;A. Mori;T. Matsumura;Y. Nakano;K. Takeshita
合成了N，N，N‘，N’-(四-2-吡啶甲基)乙二胺(TPEN)衍生物，并在AIBN存在下与N-异丙基丙烯酰胺进行了共聚反应。所制备的聚(TPENNIPA)凝胶具有热响应的溶胀/收缩行为，并将其用于从水溶液中萃取Cd(II)离子，考察了凝胶特性与萃取性能的关系。合成了含C3、C4、C10的TPEN衍生物和支化的C3间隔链组成的聚合物凝胶，并比较了它们对镉离子的温度依赖萃取行为。这些凝胶在5oC的溶胀状态下有效地从水溶液中提取Cd离子，而在45oC时几乎没有观察到有收缩的萃取物。结果表明，支化C3间隔基(C3b)的聚(TPEN-NIPA)凝胶具有良好的热响应萃取性能。
N,N,N',N'-(tetrakis-2-pyridylmethyl)ethylenediamine (TPEN) derivatives bearing a polymerizable double bond in the substituent structure of the pyridine ring are synthesized and subjected to copolymerization with N-isopropylacrylamide in the presence of AIBN. The obtained poly(TPENNIPA) gels show thermo-responsive swelling/shrinking behaviors and are employed for the extraction of cadmium(II) ion from the aqueous solution to examine the relationship of the gel characteristics and the extraction performance. The polymer gels composed of the TPEN derivative bearing C3, C4, C10 and branched C3 spacer chains are synthesized and temperature-dependent extraction behavior of cadmium ion is compared. These gels extract Cd ion efficiently from the aqueous solution in the swelling state at 5 oC, while little extraction is observed at 45 oC with shrinking. It is found that poly(TPEN-NIPA) gel of branched C3 spacer (C3b) shows the excellent thermo-responsive extraction performance.