Synthesis and characterization of layered zinc hydroxychlorides
- Department of Material Science, Faculty of Science and Engineering, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690-8504 (Japan)
- School of Chemistry, Osaka University of Education, 4-698-1 Asahigaoka, Kashiwara, Osaka 582-8582 (Japan)
Layered material of zinc hydroxychlorides (Zn{sub 5}(OH){sub 8}Cl{sub 2}.nH{sub 2}O: ZHC), which is one of the basic zinc salts (BZS), was synthesized from ZnO nano-particles aged with aqueous ZnCl{sub 2} solutions at different temperatures ranging from 6 to 140 deg. C for 48 h. X-ray diffraction (XRD) results indicated that the diffraction peaks of ZnO completely disappeared by aging at 6 deg. C and the ZHC peaks were developed. By increasing the aging temperature, crystallinity of the layered structure was improved. At 6 deg. C, the ZHC particles were thin hexagonal plate particles with sizes ranging from 1 to 3 {mu}m. The particle size of ZHC was independent of aging temperature. The atomic Cl/Zn ratios of all the ZHC materials were almost 0.2 less than 0.4 of the theoretical ratio, indicating that the synthetic ZHC is Cl-deficient. It seemed that half of Cl atoms in the layer were replaced with HCO{sub 3} {sup -} and/or OH{sup -}. The specific surface areas of ZHC estimated from N{sub 2} adsorption isotherms were ca. 10 m{sup 2} g{sup -1} and were independent of the aging temperature. However, the H{sub 2}O monolayer adsorption capacity per unit surface area (n {sub w}) for all the samples was higher than that of ZnO particles, revealing the high affinity of ZHC to H{sub 2}O molecules. The n {sub w} values were increased by reducing the crystallinity of ZHC. This enhancement of H{sub 2}O adsorption selectivity was thought to be related with less-crystallized parts of the particles. - Graphical abstract: Layered zinc hydroxychlorides (Zn {sub 5}(OH) {sub 8}Cl {sub 2}.H{sub 2}O: ZHC) were synthesized from ZnO nano-particles aged with aqueous ZnCl {sub 2} solutions at different temperatures ranging from 6 to 140 deg. C for 48 h. The ZHC particles obtained were hexagonal plate particles with sizes ranging from 1 to 3 {mu}m.
- OSTI ID:
- 21015873
- Journal Information:
- Journal of Solid State Chemistry, Vol. 180, Issue 7; Other Information: DOI: 10.1016/j.jssc.2007.05.001; PII: S0022-4596(07)00186-7; Copyright (c) 2007 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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