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Fly ash (FA) was hydrothermally treated in an alkaline solution to produce zeolite X (Z-FA). The properties of the FA and Z-FA were then investigated. The FA consisted of spherical particles of various diameters. The X-ray diffraction patterns of FA and Z-FA showed that the FA mainly consisted of mullite crystals (3Al2O3·2SiO2), while the Z-FA consisted of zeolite crystals. The specific surface area (23.3 m/g) and pore volume (57.6 μL/g) of the Z-FA were greater than those of the FA (2.7 m/g and 12.7μL/g, respectively). The pHpzc of the FA and Z-FA were 7.94 and 9.81, respectively. [DOI: 10.1380/ejssnt.2014.23]

Zeolite X Produced by Hydrothermal Treatment of Fly Ash in an Alkaline Solution