| Budget Amount *help |
¥16,250,000 (Direct Cost: ¥12,500,000、Indirect Cost: ¥3,750,000)
Fiscal Year 2017: ¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2016: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2015: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
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| Outline of Final Research Achievements |
In order to clarify the mechanism of formation of scorodite (FeAsO4・2H2O) crystals by the reaction between ferrous sulfate (FeSO4) solution containing As (V) and hematite (Fe2O3) solid, scorodite crystals were formed on the sintered hematite surface. Basic knowledge about the formation of the gel-like precursor and the formation and growth mechanism of faceted scorodite crystals was obtained by instrumental analysis such as SEM-EDX etc. In addition, the effects of synthesis conditions such as solution composition on the formation and growth of scorodite crystals were also clarified. Moreover, an experiment to recycle (reuse) the waste solution after synthesis was conducted. It was confirmed that scorodite crystals can be synthesized even when the waste solution was reused.
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