| Project/Area Number |
18510077
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Environmental technology/Environmental materials
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| Research Institution | University of Miyazaki |
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Principal Investigator |
OHE Kaoru University of Miyazaki, Faculty of Engineering, Department of Applied Chemistry, Assistant Professor (00315350)
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| Co-Investigator(Kenkyū-buntansha) |
BABA Yoshinari University of Miyazaki, Faculty of Engineering, Department of Applied Chemistry, Professor (20039291)
OSHIMA Tatsuya University of Miyazaki, Faculty of Engineering, Department of Applied Chemistry, Associate Professor (00343335)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥4,050,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥450,000)
Fiscal Year 2007: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2006: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | magnetite / As(V) / As(III) / adsorbents / environmental materials / zero point of charge / high specific surface area / groundwater pollution / チタン / 吸着 / 除去 / フェライト / 砒素 / 吸着除去 / 環境浄化 |
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| Research Abstract |
New functional magnetites were prepared by addition of elements such as Zr, Si, Mg, Ce and Ti to magnetite, and their applications to arsenic adsorption were investigated. Although the Si-magnetite has high specific surface area and high performance for arsenic removal, it cannot be used for removal of arsenic in groundwater because Si was eluted from the Si-magnetite. On the other hand, the zero point of charge of pH (PH_<zpc>) of Zr, Ce and Ti-magnetites were in the neutral pH range and they have high specific surface areas. The important factors for arsenic removal, pH_<zpc> and specific surface area were controlled by introducing different elements and mole ratios of element/ Fe when magnetites were prepared. The addition of Zr, Si, Mg, Ce and Ti cause the low crystal-growth rate of the magnetites to result in the amorphous structures. Adsorption properties for arsenic were investigated using Zr, Ce and Ti-magnetite. It was shown that Zr, Ce-magnetite effectively removed arsenic from its low concentration Ti-magnetite with Ti /Fe = 1 has a high specific surface area, 240m^2/g and the adsorption capacities of As (V) and As (III) were 0.85 and 1.2, respectively. These results were 4 - 6 times of the adsorption capacity of arsenic of the previously reported magnetites.
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