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Journal Articles

Thermoresponsive extraction of cadmium(II) ions by poly(TPEN-NIPA) gels; Effect of chain length and branched spacer structure on gel formation and extraction behavior

Inaba, Yusuke*; Tsumagari, Takayuki*; Kida, Tatsuya*; Watanabe, Wataru*; Nakajima, Yasutaka*; Fukuoka, Sachio*; Mori, Atsunori*; Matsumura, Tatsuro; Nakano, Yoshio*; Takeshita, Kenji*

Polymer Journal, 43(7), p.630 - 634, 2011/07

 Times Cited Count:11 Percentile:39.61(Polymer Science)

${it N,N,N',N'}$-(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 ${it N}$-isopropylacrylamide in the presence of AIBN. The obtained poly(TPEN-NIPA) 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(II) ion efficiently from the aqueous solution in the swelling state at 5$$^{circ}$$C, while little extraction is observed at 45$$^{circ}$$C with shrinking. It is found that poly(TPEN-NIPA) gel of branched C3 spacer (C3b) shows the excellent thermoresponsive extraction performance.

Journal Articles

Thermo-responsive extraction of cadmium(II) ion with TPEN-NIPA gel; Effect of the number of polymerizable double bond toward gel formation and the extracting behavior

Fukuoka, Sachio*; Kida, Tatsuya*; Nakajima, Yasutaka*; Tsumagari, Takayuki*; Watanabe, Wataru*; Inaba, Yusuke*; Mori, Atsunori*; Matsumura, Tatsuro; Nakano, Yoshio*; Takeshita, Kenji*

Tetrahedron, 66(9), p.1721 - 1727, 2010/02

 Times Cited Count:17 Percentile:50.38(Chemistry, Organic)

N,N,N',N'-(tetrakis-2-pyridylmethyl)ethylenediamine (TPEN) derivatives bearing the different number (1-4) of a double bond moiety on the pyridine ring are synthesized and subjected to copolymerization with N-isopropylacrylamide in the presence of AIBN. The obtained poly(TPEN-NIPA)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 three or four double bonds exhibit temperature-dependent change of swelling and shrinking in water. These gels extract CdII ion efficiently from the aqueous solution in the swelling state at 5$$^{circ}$$C, while little extraction was observed at 45$$^{circ}$$C with shrinking.

Oral presentation

Syntheses and properties of TPEN derivatives bearing hydrophobic side-chains as separating agent for minor actinides from high-level radioactive waste

Inaba, Yusuke*; Kida, Tatsuya*; Watanabe, Wataru*; Mori, Atsunori*; Matsumura, Tatsuro; Ogata, Takeshi*; Takeshita, Kenji*

no journal, , 

JP, 2007-210038   Licensable Patent Information Database   Patent publication (In Japanese)

Separation of minor actinides (MAs) from lanthanides in high-level radioactive waste (HLW) becomes important in nuclear power generation. Although TPEN is a possible candidate for the practical separating agent for MAs from HLW, there still remains difficulties in high water solubility and easy protonation characteristics. The practical MA separation is conducted from a mixture of MAs and Ln(III) in a highly acidic aqueous solution, thereby a hydrophobic and acid tolerant chelating agent needs to be developed. We herein report efficient syntheses of TPEN derivatives bearing various hydrophobic side-chains, which are alkyloxy and fluorinated alkoxy groups, and solvent extraction of Am(III) from Eu(III) in nitric acid aqueous solution. Synthesized TPEN derivatives were hydrophobic and showed higher performance than unsubstituted TPEN for Am separation from Eu in extraction with water/organic solvents at low pH region.

Oral presentation

Hybrid process combining solvent extraction and low pressure loss extraction chromatography for a reasonable MA recovery, 2; Extraction behavior of FPs and MA(III) at high concentration of TBP

Emori, Tatsuya; Morita, Keisuke; Ban, Yasutoshi; Sato, Hiromori*; Kida, Fukuka*; Arai, Tsuyoshi*; Sano, Yuichi

no journal, , 

no abstracts in English

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