2003 Fiscal Year Final Research Report Summary
Preparation of A Plate-like Particle of Calcium Aluminosilicate via Layered Double Hydroxide
| Project/Area Number |
14550798
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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 |
無機工業化学
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| Research Institution | Iwate University |
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Principal Investigator |
NARITA Eiichi Iwate Univ., Fac.of Eng., Professor, 工学部, 教授 (20111255)
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| Co-Investigator(Kenkyū-buntansha) |
AISAWA Sumio Iwate Univ., Fac.of Eng., Research Associate, 工学部, 助手 (40333752)
HIRAHARA Hidetoshi Iwate Univ., Fac.of Eng., Associate Professor, 工学部, 助教授 (30241491)
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| Project Period (FY) |
2002 – 2003
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| Keywords | Layered double hydroxide / Hydrotalcite / Inorganic layered compound / Synthesis / Intercalation / Plate-like particle / low environment load / Aluminosilicate |
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| Research Abstract |
A plate-like inorganic particle composed of non-toxic and low price materials has received considerable attention in recent years. However, the preparation of a plate-like inorganic particle is known to be generally difficult. In this study, Ca-Al-NO_3 layered double hydroxide (LDH) was synthesized as a precursor and intercalation technique was used for the preparation of Ca-Al-SiO_4 LDH. The precursor was synthesized by the direct reaction of powdered quick lime (CaO) with NaAlO_2 in alkaline aqueous solution. It was found that the Ca-Al--NO_3 LDH (d_<0030>0.87 nm, Ca_<0.72>Al_<0.28>(OH)_2(NO_3)_<0.14>(OH)_<0.14>(0.52H_2O)) particle with hexagonal plate-like shape and 1〜4 μm in diameter size was formed at the optimum condition : Ca/Al ratio 3, synthesis temperature 323 K (1 h), aging temperature 373 K (2 h). By the hydrothermal treatment of the LDH at 473 K for 0.5〜2 h, the particle diameter was increased to 10〜20 μm. Then, the ion-exchange of NO_3^-ion in these LDHs with silicate ion was carried out at 298 K and the resulting LDHs Ca_<0.72>Al_<0.28>(OH)_2(SiO_4)_<0.074>(0.43H_2O)) was heated at 573〜1,173 K for 0.5 h. During the intercalation and hydrothermal treatments, the plate-like particle shape was maintained and the crystalline material of gehlenite (Ca_2Al_2SiO_7) as main phase was obtained. In conclusion, we succeeded the preparation of a plate-like particle of calcium aluminosilicate from non-toxic and low price materials such as limestone and NaAlO_2.
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