SYNTHESIS AND PHYSICOCHEMICAL PROPERTIES OF Zn-HECTORITE

Both refluxing reaction under atmospheric pressure and hydrothermal reaction underautogenous water vapor pressure of two kinds of starting slurry with the initial molar ratio Na: Zn: Li: Si =0.7: 5.4: 0.6: 8.0 and 1.4: 5.4: 1.2: 8.0 made from Zn-Si homogeneous precipitates, lithium fluoride and sodi...

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Bibliographic Details
Published in:Clay Science 2004, Vol.12(5), pp.285-291
Main Authors: NAKAKUKI, TAKAHITO, FUJIMURA, KAORI, AISAWA, SUMIO, HIRAHARA, HIDETOSHI, NARITA, EIICHI
Format: Article
Language:English
Subjects:
Cation exchange capacity
Earth sciences
Earth, ocean, space
Exact sciences and technology
Hydrothermal reaction
Methylene blue adsorptive ability
Mineralogy
Refluxing reaction
Silicates
Smectite
Zn-hectorite
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Summary:Both refluxing reaction under atmospheric pressure and hydrothermal reaction underautogenous water vapor pressure of two kinds of starting slurry with the initial molar ratio Na: Zn: Li: Si =0.7: 5.4: 0.6: 8.0 and 1.4: 5.4: 1.2: 8.0 made from Zn-Si homogeneous precipitates, lithium fluoride and sodium hydroxide successfully have yielded Zn-hectorites containing Zn2+ instead of Mg2+ in the trioctahedral sheets. Zn-hectorites have expansion of the basal spacing (door) by the treatment with ethylene glycol on powder X-ray diffraction (XRD) patterns, and characterized by Zn-O vibration in the around 660-670cm-1 on fourier transform infrared spectrometer (FT-IR) spectra, peaks assigned to Zn2p on X-ray photoelectron spectrometer (XPS) spectra and thermal dehydroxylationat lower temperature on thermogravimetry and differential thermal analysis (TG-DTA). It hasalso clarified that Zn-hectorite synthesized by hydrothermal reaction under autogenous water vapor pressure is relatively large massive particles and has a larger CEC, although it has lower MB adsorptive ability compared to a commercial Mg-hectorite as reference.
ISSN:0009-8574
2186-3555
DOI:10.11362/jcssjclayscience1960.12.285