種々のMg-Fe系複合酸化物を用いた希薄水溶液中のホウ素およびヒ素の除去  [in Japanese] Removal of Borate and Arsenite in Dilute Aqueous Solution with Various Mg-Fe Composite Oxides  [in Japanese]

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Author(s)

    • 五十井 浩平 ISOI Kohei
    • 関西大学環境都市工学部エネルギー・環境工学科 Department of Chemical, Energy and Environmental Engineering, Kansai University
    • 白杉 文香 SHIRASUGI Fumika
    • 関西大学環境都市工学部エネルギー・環境工学科 Department of Chemical, Energy and Environmental Engineering, Kansai University
    • 松岡 光昭 MATSUOKA Mitsuaki
    • 関西大学環境都市工学部エネルギー・環境工学科 Department of Chemical, Energy and Environmental Engineering, Kansai University
    • 林 順一 HAYASHI Junichi
    • 関西大学環境都市工学部エネルギー・環境工学科 Department of Chemical, Energy and Environmental Engineering, Kansai University
    • 村山 憲弘 MURAYAMA Norihiro
    • 関西大学環境都市工学部エネルギー・環境工学科 Department of Chemical, Energy and Environmental Engineering, Kansai University

Abstract

<p>Mg-Fe composite oxides with various mixing ratios were synthesized at different calcination temperature, to use them as anion removal agents. Crystal structure and specific surface area of the Mg-Fe composite oxides were evaluated. The B and As(III) removal tests from dilute aqueous solution (initial concentration: 20 mg/dm<sup>3</sup>) were conducted by using the Mg-Fe composite oxides. The predominant factors for removing them efficiently were considered.</p><p>The Mg-Fe composite oxides having various specific surface area and different crystal structure are obtained, depending on the chemical composition and the calcination temperature. When the mixing ratios are set to Mg:Fe = 1:1, 2:1 and 3:1, respectively, Mg-Fe type LDH is mainly formed as a precursor before calcination. Amorphous composite oxide is obtained by the calcination of Mg-Fe type LDH at 400°C. Approximately, the specific surface area of Mg-Fe composite oxides is increasing with an increase in the mixing ratio of Fe. On the other hand, the specific surface area of them also tends to decrease as the calcination temperature increases over 600°C.</p><p>As the B removal mechanism from dilute aqueous solution, it is considered that (1) the formation of Mg(OH)<sub>2</sub> on the particle surface by the hydration of Mg-Fe composite oxides during removal operation and (2) the reconstruction of LDH structure by the partial hydration of Mg-Fe composite oxides are predominant. It is also found that (1) the hydration on the surface of MgO particles, (2) the reconstruction of LDH structure by the partial hydration, (3) the affinity with As(III) due to Fe and (4) the high specific surface area are effective for the As(III) removal.</p>

Journal

  • Resources Processing

    Resources Processing 66(1), 29-35, 2019

    The Resources Processing Society of Japan

Codes

  • NII Article ID (NAID)
    130007666990
  • NII NACSIS-CAT ID (NCID)
    AA11907992
  • Text Lang
    JPN
  • ISSN
    1348-6012
  • NDL Article ID
    029797833
  • NDL Call No.
    Z17-275
  • Data Source
    NDL  J-STAGE 
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