Nanocomposites Prepared via Acid Treatment from Calcium Silicate for Enhanced CO<sub>2</sub> Fixation

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  • FUJINARI Shintaro
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University
  • TOKUDOME Yasuaki
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • MURATA Hidenobu
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University
  • NAKAHIRA Atsushi
    Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University Department of Materials Science, Graduate School of Engineering, Osaka Metropolitan University

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  • 酸処理によるケイ酸カルシウムからのナノコンポジット合成とCO<sub>2</sub>固定化特性の評価
  • 酸処理によるケイ酸カルシウムからのナノコンポジット合成とCO₂固定化特性の評価
  • サン ショリ ニ ヨル ケイサン カルシウム カラ ノ ナノコンポジット ゴウセイ ト CO ₂ コテイカ トクセイ ノ ヒョウカ

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<p>Xonotlite, with a chemical formula of Ca6(Si6O17)(OH)2, has been widely used as a thermal insulation material due to its high porosity and chemical/physical stabilities. As a potential recycle use of Xonotlite, CO2 fixation is promising when considering its high alkali content and macroporous structure. In this study, Xonotlite was chemically activated to form nanocomposites of silica and calcium salt by optimizing an acid treatment. It was found that Xonotlite treated with acetic acid at 1.0 mol/L keeps the original macroporous structure of Xonotlite, and simultaneously segregates calcium salt on the surface of the residual silica. The nanocomposite of silica and calcium salt exhibits the capability of CO2 fixation and high cycle stability thanks to the unique structural feature of the composite.</p>

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