Journal
APPLIED CLAY SCIENCE
Volume 97-98, Issue -, Pages 182-186Publisher
ELSEVIER
DOI: 10.1016/j.clay.2014.05.026
Keywords
Bentonite; White and red clay; Zeolite; Hydrothermal; Recrystallization
Funding
- National Research Foundation (NRF)
- Water Research Council
- University of the Western Cape
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Clays obtained from South Africa were used as feedstock materials for the synthesis of zeolites. The conventional alkaline hydrothermal treatment of the starting material (90 degrees C for 8 h) was preceded by a fusion step (550 degrees C for 1.5 h) to improve the solubility of aluminium and silicon. Various characterization techniques such as X-ray diffraction (XRD), X-ray fluorescence (XRF), scanning electron microscopy (SEM) and Fourier transform infrared (FTIR) spectroscopy were employed to probe the properties of the as-received clays as well as the resulting zeolitic phase. The synthesized zeolite X and hydroxy-sodalite were of high crystalline quality hence making clay materials a cheaper alternative for producing high quality zeolites. (c) 2014 Elsevier B.V. All rights reserved.
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