EFFECTS OF ACTIVE SILICA ON STABILIZATION REACTION OF COPPER AND NICKEL IONS BY MAGNESIA
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概要
- 論文の詳細を見る
Magnesia (MgO) is gaining an interest as an agent for stabilization of some heavy metals in the contaminated soils. MgO also reacts with silica (SiO_2) and water at room temperatures and atmospheric pressures to form layer silicates. The presence of SiO_2 may affect the stabilization of heavy metals by MgO. To investigate the effects of SiO_2, we mixed MgO, SiO_2, and solutions of Cu(NO_3)_2 or Ni(NO_3)_2 at a solid: solution ratio of 1kg: 2L. The reaction products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), and chemical analyses. Suspensions immediately turned alkaline in both systems due to hydration of MgO. XRD and FT-IR results showed that copper nitrate hydroxide (Cu_2NO_3(OH)_3) or nickel hydroxide (Ni(OH)_2) as well as brucite (Mg(OH)_2) precipitated just after mixing and they gradually disappeared to form poorly ordered layer silicate minerals. The Cu and Ni concentrations were kept low throughout the experiments. We interpreted the experimental results as indicating that a part of the Cu and Ni were incorporated in octahedral sites of the newly formed layer silicate minerals. The sequential extraction with water and MgCl_2 solution indicated that the amounts of extractable Cu and Ni were larger for the products from heavy metal-MgO-SiO_2 systems than for heavy metal-MgO systems. The results show that the presence of active SiO_2 is a little detrimental to the stabilization of Cu and Ni by MgO in a short term but may be advantageous in a long run.
- 日本粘土学会の論文
著者
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ONO Hiroyuki
Department of Gastroenterology, National Cancer Center Hospital
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Wada Shin-ichiro
Department Of Plant Resources Faculty Of Agriculture Kyushu University
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Wada Shin-ichiro
Department Of Agricultural Chemistry
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Ono Hiroyuki
Department Of Plant Resources Graduate School Of Bioresources And Environmental Sciences Kyushu Univ
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Ono Hiroyuki
Department Of Electronic Chemistry Interdisciplinary Graduate School Of Science And Engineering Toky
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