摘要
The interaction of the fly ash and NaOH, in an open reflux hydrothermal system at 100℃, has been explored by several researchers and formation of fly ash zeolites has been confirmed based on the X-ray diffraction analysis of the residues. However, this method does not reveal much about the characteristic transitions （viz. elemental, electro-negativity and cation exchange capa- city） of the residues. In this situation, resorting to Fourier transform-infrared radiation （FT-IR） spectroscopy on the residues obtained from two-stage hydrothermal treatment process, described in this manuscript, appears to be a novel idea to establish transitions in chemical bonds （viz., -Si- OH-AI-, OH-Na, OH-A1-）, crystallinity and cation exchange capacity of these residues. Based on extensive studies, it has been demonstrated that FT-IR spectroscopy is extremely useful for 1） detection of chemical bonds in the residues, 2） evaluation of zeolites in the residues and 3） also establishing the superiority of the two-stage interac- tion of the fly ash with NaOH for synthesizing better fly ash zeolites （viz., Na-P1 and Hydroxysodalte） as compared to those obtained from the conventional single-stage treatment of the fly ash.
The interaction of the fly ash and NaOH, in an open reflux hydrothermal system at 100℃, has been explored by several researchers and formation of fly ash zeolites has been confirmed based on the X-ray diffraction analysis of the residues. However, this method does not reveal much about the characteristic transitions （viz. elemental, electro-negativity and cation exchange capa- city） of the residues. In this situation, resorting to Fourier transform-infrared radiation （FT-IR） spectroscopy on the residues obtained from two-stage hydrothermal treatment process, described in this manuscript, appears to be a novel idea to establish transitions in chemical bonds （viz., -Si- OH-AI-, OH-Na, OH-A1-）, crystallinity and cation exchange capacity of these residues. Based on extensive studies, it has been demonstrated that FT-IR spectroscopy is extremely useful for 1） detection of chemical bonds in the residues, 2） evaluation of zeolites in the residues and 3） also establishing the superiority of the two-stage interac- tion of the fly ash with NaOH for synthesizing better fly ash zeolites （viz., Na-P1 and Hydroxysodalte） as compared to those obtained from the conventional single-stage treatment of the fly ash.
