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Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination

In this research, phase transformation and the role of NaOH on the structure of coal fly ash (CFA) during an alkali-calcination process were identified by a combination of X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and deconvolution analysis. The variation in the different fun...

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Autores principales: Yang, Jingjie, Sun, Hongjuan, Peng, Tongjiang, Zeng, Li, Chao, Li
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7958134/
https://www.ncbi.nlm.nih.gov/pubmed/33801284
http://dx.doi.org/10.3390/ma14051163
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author Yang, Jingjie
Sun, Hongjuan
Peng, Tongjiang
Zeng, Li
Chao, Li
author_facet Yang, Jingjie
Sun, Hongjuan
Peng, Tongjiang
Zeng, Li
Chao, Li
author_sort Yang, Jingjie
collection PubMed
description In this research, phase transformation and the role of NaOH on the structure of coal fly ash (CFA) during an alkali-calcination process were identified by a combination of X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and deconvolution analysis. The variation in the different functional groups and structural parameters of the raw and post-alkali calcinated CFA were analysed by deconvolution of the FTIR results, conducted with a Gaussian approach. The results, firstly, provide a deep insight into the functional groups in CFA. In CFA systems, the vibration signals of Q(0), Q(1), Q(2) and Q(3) were detected and the dominant structural units associated with Si tetrahedron groups were isolated to Q(3) and Q(2). Deconvolution analysis of the band from 400 to 1400 cm(−1) showed that the added NaOH resulted in an increase in Q(1) at the cost of Q(3) and Q(2) and the degree of reaction of the CFA was, therefore, decreased. Concurrently, it was established that the changes in the Gaussian peak component were related to the calcination temperature and time that allowed us to tailor the model of the structural decomposition of CFA.
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spelling pubmed-79581342021-03-16 Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination Yang, Jingjie Sun, Hongjuan Peng, Tongjiang Zeng, Li Chao, Li Materials (Basel) Article In this research, phase transformation and the role of NaOH on the structure of coal fly ash (CFA) during an alkali-calcination process were identified by a combination of X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) and deconvolution analysis. The variation in the different functional groups and structural parameters of the raw and post-alkali calcinated CFA were analysed by deconvolution of the FTIR results, conducted with a Gaussian approach. The results, firstly, provide a deep insight into the functional groups in CFA. In CFA systems, the vibration signals of Q(0), Q(1), Q(2) and Q(3) were detected and the dominant structural units associated with Si tetrahedron groups were isolated to Q(3) and Q(2). Deconvolution analysis of the band from 400 to 1400 cm(−1) showed that the added NaOH resulted in an increase in Q(1) at the cost of Q(3) and Q(2) and the degree of reaction of the CFA was, therefore, decreased. Concurrently, it was established that the changes in the Gaussian peak component were related to the calcination temperature and time that allowed us to tailor the model of the structural decomposition of CFA. MDPI 2021-03-02 /pmc/articles/PMC7958134/ /pubmed/33801284 http://dx.doi.org/10.3390/ma14051163 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Yang, Jingjie
Sun, Hongjuan
Peng, Tongjiang
Zeng, Li
Chao, Li
Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
title Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
title_full Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
title_fullStr Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
title_full_unstemmed Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
title_short Study on the Overall Reaction Pathways and Structural Transformations during Decomposition of Coal Fly Ash in the Process of Alkali-Calcination
title_sort study on the overall reaction pathways and structural transformations during decomposition of coal fly ash in the process of alkali-calcination
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7958134/
https://www.ncbi.nlm.nih.gov/pubmed/33801284
http://dx.doi.org/10.3390/ma14051163
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