Structural Characterization of Four South African Fly Ashes and Their Structural Changes with [Beta]-Cyclodextrin

• Published in: Particulate science and technology Vol. 32; no. 4; p. 360
• Main Authors: Ikotun, B D, Mishra, S, Fanourakis, G C
• Format: Journal Article
• Language: English
• Published: Philadelphia Taylor & Francis Ltd 01.07.2014
• Subjects: Bending; Chemical compounds; Fluorescence; Fly ash; Fourier transforms; Frequencies; Vibration
• ISSN: 0272-6351; 1548-0046

This article examines the structural characteristics of four South African fly ashes and their structural changes with β-cyclodextrin so as to compare their structural responses to fly ash-β-cyclodextrin (FA-βCD) composite. The four different fly ashes, obtained from different power stations in South Africa were subjected to x-ray fluorescence (XRF), particle size distribution, x-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR) analysis. FA;-bgr-xCD composites were subjected to XRD and FTIR analyses. The XRF analysis showed that all the fly ash samples used are in class F with SiO^sub 2^ + Al^sub 2^O^sub 3^ + Fe^sub 2^O^sub 3^ greater than 70%. The average particle sizes of all fly ash samples were less than 0.075 mm; the major mineral phase in all fly ash samples was quartz (SiO^sub 2^). The FTIR analysis showed Si-O-Si asymmetric and Al-O symmetric stretching vibrations in all fly ash samples. FA-βCD composites for all the fly ashes revealed additional upcoming peaks between diffraction angles (2...) 10° and 25°, which was not in the raw fly ashes. Shift in FTIR spectra frequencies and an additional peak at approximately 1155 cm^sup -1^ attributed to O-Si-O bending vibration were observed in all the composite samples. (ProQuest: ... denotes formulae/symbols omitted.)