1998 Fiscal Year Final Research Report Summary
Wastwater Treatment by Using Thermo-responsive Polymer
| Project/Area Number |
09558078
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
環境保全
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| Research Institution | Tokyo University of Pharmacy and Life Science |
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Principal Investigator |
MATSUBARA Chiyo Tokyo University of Pharmacy and Life Science, School of Life Science, Professor, 生命科学部, 教授 (10057309)
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| Co-Investigator(Kenkyū-buntansha) |
IWAKI Kazuo Ebara Research Co., Center for Technology Development, 技術開発研究所, 技術開発室長
SAITOH Tohru Tokyo University of Pharmacy and Life Sience, School of Life Science, Assistant, 生命科学部, 講師 (40186945)
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| Project Period (FY) |
1997 – 1998
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| Keywords | N-isopropylacrylamide / polymer / concentration / hydrophobic / temperature / organic compound / extraction / phase separation |
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| Research Abstract |
A water-soluble polymer, poly(N-isopropylacrylamide), PNIPAAm, become waterinsoluble above a lower critical solution temperature(ca.32ﾟC) and forms gum-like aggregates (polymer phase) having very small volume fraction. The features in the polymer precipitation were dependent on the molec ular weight of the polymer and/or the concentration of salts or buffer components. Accompanying with the formation of the polymer phase, hydrophobic organic compounds including poly cyclic aromatic hydrocarbons, alkylphenols, chlorobenzens, chlorophenols, phthalic esters, pesticides and steroid hormones in water were efficiently incorporated into the polymer phase. On the other hand, hydrophilic components such as inorganic ions or polysaccharides remained in the bulk aqueous solution. The extractabilities of compounds increased with increasing the hydrophobic properties. The distribution coefficients, based on the volume fractions of their aqueous and polymer phases, were correlated with the aqueous-octanol distribution coefficients and aqueous-polymer distribution constants. Linear relationship between two equilibrium coefficients indicated that the hydrophobic interaction is predominating force for incorporating solutes. The application of the polymer-mediated extraction to wastwater treatment will greatly extend the potential of this method in the pre-concentration of traces of environmental pollutants such as chlorophenols, pesticides.
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