JP2013540093A - マグネタイトとバーネサイトとの粒団状の混合物、その合成方法及びその混合物を用いる水処理方法 - Google Patents
マグネタイトとバーネサイトとの粒団状の混合物、その合成方法及びその混合物を用いる水処理方法 Download PDFInfo
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Abstract
本発明によるマグネタイト−バーネサイト混合物の合成方法は、マグネタイトを合成する第1合成段階と、マグネタイトの存在下で、塩基性状態を維持するうちマンガンを供給してマグネタイトの表面にマンガンを吸着させた後、酸化剤とナトリウムとを供給してマグネタイトの表面にバーネサイトを合成することで、マグネタイトとバーネサイトとが結合された混合物を形成させる第2合成段階と、マグネタイトとバーネサイトとの混合物を精製する精製段階と、を含んでなる。
Description
すなわち、第1溶液から溶出された2価鉄イオンのうち一部は溶存酸素によって酸化して3価の鉄イオンになり、2価と3価との鉄イオンが水酸化イオンを消耗しつつマグネタイトを形成する。マグネタイトは固体形態に沈澱される。
すなわち、酸化剤は、2価のマンガンイオンを3価または4価に酸化させ、酸化されたマンガンイオンとナトリウムイオン及び水酸化イオンとが互いに反応してバーネサイト(NaMn2O4・15H2O)を形成する。マンガンイオンがマグネタイトの表面に吸着した状態でバーネサイトに合成されるので、マグネタイトは、バーネサイトが合成される結晶核として作用する。これによって、マグネタイトとバーネサイトとが結合された形態の混合物が形成され、マグネタイトとバーネサイトとは共に粒団(aggregate)を形成する。
Claims (17)
- マグネタイトを合成する第1合成段階と、
前記マグネタイトの存在下で、塩基性状態を維持するうちマンガンを供給して前記マグネタイトの表面に前記マンガンを吸着させた後、酸化剤とナトリウムとを供給して前記マグネタイトの表面にバーネサイトを合成することで、前記マグネタイトとバーネサイトとが結合された混合物を形成させる第2合成段階と、
前記マグネタイトとバーネサイトとの混合物を精製する精製段階と、を含んでなることを特徴とするマグネタイト−バーネサイト混合物の合成方法。 - 前記マグネタイトを合成する第1合成段階では、
空気と接触した状態で、鉄イオンを含む第1溶液と水酸化イオンを含む第2溶液とを互いに混合し、混合液が塩基性状態を維持する状態でマグネタイトを合成することを特徴とする請求項1に記載のマグネタイト−バーネサイト混合物の合成方法。 - 前記第1溶液は塩化鉄溶液であり、前記第2溶液は水酸化ナトリウム溶液であることを特徴とする請求項2に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記第2溶液を前記第1溶液に混合し、前記混合液のpHは11〜12に維持することを特徴とする請求項2に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記第2合成段階では、
前記第1合成段階で合成されたマグネタイトにマンガンイオンを含む第3溶液と、ナトリウムイオンを含む第4溶液、及び前記第3溶液内のマンガンイオンを酸化させるための酸化剤を添加し、
前記マグネタイトと第3溶液及び第4溶液とを含む全体溶液のpHを8以上に維持し、前記マグネタイトの表面でバーネサイトを合成させることを特徴とする請求項1に記載のマグネタイト−バーネサイト混合物の合成方法。 - 前記第3溶液は塩化マンガン溶液であり、酸化剤は過酸化水素であることを特徴とする請求項5に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記第4溶液は、水酸化ナトリウム溶液であることを特徴とする請求項5に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記水酸化ナトリウム溶液のモル濃度は、前記第3溶液のマンガンイオンのモル濃度の3.5〜5倍であることを特徴とする請求項7に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記第1合成段階では、鉄イオンを含む第1溶液を用い、
前記第2合成段階では、マンガンイオンを含む第3溶液を用い、
前記第1溶液の鉄イオンと前記第3溶液のマンガンイオンとのモル濃度比2.5〜4倍であることを特徴とする請求項1に記載のマグネタイト−バーネサイト混合物の合成方法。 - 前記精製段階では、磁力を用いてマグネタイトとバーネサイトとの混合物を分離することを特徴とする請求項1に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記精製段階で使われる磁石は、1,000〜5,000ガウスの磁場を形成することを特徴とする請求項10に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記マグネタイトとバーネサイトとの混合物は、粒団(aggregate)状を形成することを特徴とする請求項1に記載のマグネタイト−バーネサイト混合物の合成方法。
- 前記マグネタイトとバーネサイトとの混合物は、6〜60μmの粒度で形成されることを特徴とする請求項1に記載のマグネタイト−バーネサイト混合物の合成方法。
- 陽イオン汚染物質と陰イオン汚染物質とを共に除去するためのものであり、
前記請求項1ないし13のうちいずれか一項に記載の合成方法によって合成されたことを特徴とするマグネタイト−バーネサイト混合物。 - 陽イオン汚染物質と陰イオン汚染物質とがいずれも含まれている廃水を処理するためのものであり、
前記請求項1ないし13のうちいずれか一項に記載の合成方法によって合成されたマグネタイト−バーネサイト混合物を前記廃水に入れ込み、前記陽イオン及び陰イオン汚染物質を吸着させて除去することを特徴とする水処理方法。 - 前記マグネタイト−バーネサイト混合物を用いて前記汚染物質を除去した後、磁力を用いて前記汚染物質が吸着されているマグネタイト−バーネサイト混合物を廃水から分離することを特徴とする請求項15に記載の水処理方法。
- 前記マグネタイトを合成するための鉄イオンのモル濃度に対する前記バーネサイトを合成するためのマンガンイオンのモル濃度を調節することで、最終に製造されるマグネタイト−バーネサイト混合物でマグネタイトとバーネサイトとの含量比を定め、
前記廃水の成分分析により、前記陰イオン汚染物質が陽イオン汚染物質に比べて多い場合、前記マグネタイト−バーネサイト混合物で前記マグネタイトの含量を前記バーネサイトの含量より高くし、逆の場合、前記バーネサイトの含量を前記マグネタイトの含量より高く製造して前記汚染物質を除去することを特徴とする請求項15に記載の水処理方法。
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WO2018110615A1 (ja) * | 2016-12-13 | 2018-06-21 | 国立大学法人香川大学 | ストロンチウムイオン吸着剤およびその製造方法 |
WO2018109823A1 (ja) * | 2016-12-13 | 2018-06-21 | 国立大学法人香川大学 | ストロンチウムイオン吸着剤およびその製造方法 |
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JP5674952B2 (ja) | 2015-02-25 |
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