Silicate removal in aluminum hydroxide co-precipitation process

Chiharu Tokoro*, Shinya Suzuki, Daisuke Haraguchi, Sayaka Izawa

*この研究の対応する著者

研究成果: Article査読

30 被引用数 (Scopus)

抄録

The removal mechanisms of silicate using an aluminum hydroxide co-precipitation process was investigated and compared with an adsorption process, in order to establish an effective and validated method for silicate removal from wastewater. Adsorption isotherms, XRD and FT-IR analyses showed that silicate uptake occurred by adsorption to boehmite for initial Si/Al molar ratios smaller than two, but by precipitation of poorly crystalline kaolinite for the ratios larger than two, in both co-precipitation and adsorption processes. Silicate was removed by two steps: (i) an initial rapid uptake in a few seconds; and (ii) a slow uptake over several hours in both processes. The uptake rate in the first step was higher in the co-precipitation process than in adsorption process, presumably due to increased silicate adsorption to boehmite and rapid precipitation of kaolinite. These results suggest that silicate removal using aluminum salts could be effectively achieved if the pH adjustment and aluminum concentration are strictly controlled.

本文言語English
ページ(範囲)1084-1096
ページ数13
ジャーナルMaterials
7
2
DOI
出版ステータスPublished - 2014

ASJC Scopus subject areas

  • 材料科学(全般)

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