Synthesis of thermosensitive polymer/mesoporous silica composite and its temperature dependence of anion exchange property.
An anion exchanger consisting of amino-functionalized MCM-41 type mesoporous silica coated with temperature-responsive polymer, poly(N-isopropylacrylamide) (PNIPAM), was synthesized in this study. The structure of this composite was characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), and elemental analysis. The XRD pattern showed that the synthesized composite had the ordered hexagonal structure and the interplanar spacing, d(100), was around 40Å. The amount of surface-grafted thermosensitive polymer was estimated to be about 0.8wt.% by elemental analysis. The adsorption-desorption behavior of methyl orange in this synthesized material depended on the temperature of aqueous solution: at 25°C, the reversible adsorption-desorption of methyl orange was repeated with changing pH of the solution; at 40°C, the methyl orange was not adsorbed and desorbed independent of pH of the solution.
Department of Engineering in Applied Chemistry, Faculty of Engineering and Resource Science, Akita University, Akita 010-8502, Japan. murakami@ipc.akita-u.ac.jp
Kenji
K
Murakami
Xue
X
Yu
Shinichi
S
Watanabe
Takahiro
T
Kato
Yukihiko
Y
Inoue
Katsuyasu
K
Sugawara