Authors: Wang, Yu; Shang, Yunshuai; Zhu, Jiang; Wu, Jian; Ji, Shouhua; Meng, Changgong

Source: Journal of Chemical Technology & Biotechnology, Volume 84, Number 12, December 2009 , pp. 1894-1898(5)

Publisher: John Wiley & Sons, Ltd.

Abstract:

BACKGROUND: This study investigated the synthesis of magadiite from a natural diatomite material. The influence of key reaction parameters, including reaction time, temperature and molar ratios of Na₂O/SiO₂ and H₂O/Na₂O, on the formation of magadiite were investigated. The as-synthesized magadiite was characterized by X-ray powder diffraction, scanning electron microscopy, infrared spectroscopy, thermogravimetry and differential thermal analysis.

RESULTS: The well crystallized magadiite with a rosette like morphology was prepared from a dispersion with the molar ratio H₂O/Na₂O = 28.15 and Na₂O/SiO₂ = 0.15 by heating at 160 °C for 42 h. The basal space of the synthesized magadiite is 15.5 Å and the stretching and bending frequencies of the SiO₄ units making up the magadiite layer were recorded. The layered structure was destroyed when the temperature rose above 250 °C, and combining the results of thermogravimetry and differential thermal analysis suggested the structural alteration may be due to the condensation of silanol groups.

CONCLUSION: Diatomite has been used to synthesize magadiite with a high purity and well crystallized. The cost of synthesis has been reduced allowing its use in conventional industrial applications, thus expanding the commercial utilization of diatomite. Copyright © 2009 Society of Chemical Industry

Keywords: diatomite; magadiite; layered silicate; crystallization

Document Type: Research article

DOI: http://dx.doi.org/10.1002/jctb.2262

Publication date: 2009-12-01

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