カワムラ　クニオ   KAWAMURA Kunio   川村　邦男    所属   広島修道大学  人間環境学部    職種   教授
言語種別	英語
発行・発表の年月	2007/03
形態種別	学術論文
査読	査読有り
標題	Morphology of aluminum phosphate by the Al-EDTA mediated particle formation in aqueous solutions at high temperatures
執筆形態	共著
掲載誌名	Mater. Res. Bull.
掲載区分	国外
巻・号・頁	42(2),pp.256-264
担当範囲	Corresponding author
著者・共著者	◎Kunio Kawamura, Kazumichi Shibuya, Akitsugu Okuwaki
概要	The morphology of aluminum phosphate, formed by homogeneous precipitation in aqueous solutions using Al-ethylenedia- minetetraacetic acid (Al-EDTA) complex in the presence of H2O2, was investigated under several temperature conditions, and pH, Al-EDTA, and H2O2 concentrations. Spherical particles were formed at pH 4–8 at 125–200 oC. Since nonspherical precipitates were observed in the absence of EDTA or H2O2, the formation of the spherical particles at pH 4–8 is attributed to the slow release of Al3+ ions by the degradation and/or dissociation of Al-EDTA with H2O2 under hydrothermal conditions. The size of the spherical particles obtained with Al-EDTA depends on the concentration of the Al-EDTA chelate and H2O2, and also on temperature; the size distribution of the particles decreased significantly with the H2O2 concentration and temperature.