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Synthesis of magadiite using a natural diatomite material
Author(s) -
Wang Yu,
Shang Yunshuai,
Zhu Jiang,
Wu Jian,
Ji Shouhua,
Meng Changgong
Publication year - 2009
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.2262
Subject(s) - thermogravimetry , silanol , differential thermal analysis , materials science , scanning electron microscope , thermal analysis , chemical engineering , infrared spectroscopy , nuclear chemistry , mineralogy , chemistry , diffraction , thermal , catalysis , composite material , organic chemistry , physics , optics , meteorology , engineering
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 Na 2 O/SiO 2 and H 2 O/Na 2 O, 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 H 2 O/Na 2 O = 28.15 and Na 2 O/SiO 2 = 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 SiO 4 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