Abstract
Both refluxing reaction under atmospheric pressure and hydrothermal reaction under autogenous 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 Zn 2+ instead of Mg 2+ in the trioctahedral sheets. Zn-hectorites have expansion of the basal spacing (d 001 ) by the treatment with ethylene glycol on powder X-ray diffraction (XRD) patterns, and characterized by Zn-O vibration in the around 660-670 cm -1 on fourier transform infrared spectrometer (FT-IR) spectra, peaks assigned to Zn2p on X-ray photoelectron spectrometer (XPS) spectra and thermal dehydroxylation at lower temperature on thermogravimetry and differential thermal analysis (TG-DTA). It has also 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.
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