A Nickel Hydroxide-Vermiculite Complex: Preparation and Characterization

Motoki Uehara1, Atsushi Yamzaki2, Taku Umezawa3, Koichiro Takahashi1 and Sadao Tsutsumi3
1 National Institute for Research in Inorganic Materials, 1-1, Namiki, Tsukuba-shi, Ibaraki 305-0044, Japan
2 Department of Resources and Environmental Engineering, School of Science and Engineering, Waseda University, 3-4-1, Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan,
3 Institute of Earth Science, School of Education, Waseda University, 1-6-1, Nishiwaseda, Shinjuku-ku, Tokyo 169-8050, Japan
E-mail of corresponding author: m-uehara@pa2.so-net.ne.jp

Abstract: A nickel hydroxide-vermiculite complex (NHVC) with csinβ = 1.41 nm and particle sizes from 0.075 to 0.15 mm was obtained hydrothermally by adding nickel nitrate solution to vermiculite from Transvaal, South Africa. The quantity of nickel hydroxide included in NHVC was controlled by adjusting the concentration of the nickel nitrate solution. The thermal behavior of NHVC at 450°C or above was independent of the Ni content. However, small differences exist in the dehydration behavior of NHVC below 450°C. One-dimensional Fourier electron density analysis of the NHVC structure containing 2.43 mol of Ni per half unit cell showed that Ni cations occupy the interlayer of NHVC, and 10% of the total Ni cations is in the ditrigonal cavity of the basal-oxygen plane of the tetrahedral sheet.

Key Words: Clay-Inorganic Complex • One-Dimensional Fourier Electron Density Map • Nickel Hydroxide • Vermiculite

Clays and Clay Minerals; December 1999 v. 47; no. 6; p. 726-731; DOI: 10.1346/CCMN.1999.0470606
© 1999, The Clay Minerals Society
Clay Minerals Society (www.clays.org)