Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers

Fly ash from the incineration of domestic waste contains heavy metals, which is harmful to the environment. To reduce and prevent their contamination, heavy metal ions need to be sequestered. In this study, the geopolymer prepared by fly ash, a kind of power plant waste, is used to cure the heavy me...

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Autores principales:	Fang Liu, Ran Tang, Baomin Wang, Xiaosa Yuan
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	fly ash geopolymer solidification heavy metal leaching concentration Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
Acceso en línea:	https://doaj.org/article/7f18727318cb4a4d8845c0743d359a33
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spelling	oai:doaj.org-article:7f18727318cb4a4d8845c0743d359a332021-11-25T19:02:37ZExperimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers10.3390/su1322126212071-1050https://doaj.org/article/7f18727318cb4a4d8845c0743d359a332021-11-01T00:00:00Zhttps://www.mdpi.com/2071-1050/13/22/12621https://doaj.org/toc/2071-1050Fly ash from the incineration of domestic waste contains heavy metals, which is harmful to the environment. To reduce and prevent their contamination, heavy metal ions need to be sequestered. In this study, the geopolymer prepared by fly ash, a kind of power plant waste, is used to cure the heavy metal Pb<sup>2+</sup>, and to investigate the effect of different concentrations of Pb<sup>2+</sup> on the compressive strength of the solidified body at different ages; the curing effect is judged by the toxic leaching concentration of heavy metals; the resistance of the solidified body to immersion is evaluated by comparing the change in strength before and after leaching; the fly ash-based geopolymer solidified body is compared with the cement solidified body in terms of curing effectiveness; the properties of the geopolymer and its mechanism of curing heavy metals are explored by microscopic tests. The results show that the fly ash-based geopolymer solidified body has good resistance to immersion; the optimum curing concentration of Pb<sup>2+</sup> in fly ash-based geopolymers is 2.0%; compared to pure geopolymers, the strength of the solidified body at 28 d decreases by only 13.0%, and the leaching concentration of Pb<sup>2+</sup> is 4.73 mg·L<sup>−1</sup>, which meets the specification requirements; the curing effect of the fly ash-based geopolymer is better than the cement solidified body; the microscopic test results indicate that the curing of Pb<sup>2+</sup> by the fly ash-based geopolymer is a combination of both chemical bonding and physical fixation.Fang LiuRan TangBaomin WangXiaosa YuanMDPI AGarticlefly ashgeopolymersolidificationheavy metalleaching concentrationEnvironmental effects of industries and plantsTD194-195Renewable energy sourcesTJ807-830Environmental sciencesGE1-350ENSustainability, Vol 13, Iss 12621, p 12621 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	fly ash geopolymer solidification heavy metal leaching concentration Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350
spellingShingle	fly ash geopolymer solidification heavy metal leaching concentration Environmental effects of industries and plants TD194-195 Renewable energy sources TJ807-830 Environmental sciences GE1-350 Fang Liu Ran Tang Baomin Wang Xiaosa Yuan Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers
description	Fly ash from the incineration of domestic waste contains heavy metals, which is harmful to the environment. To reduce and prevent their contamination, heavy metal ions need to be sequestered. In this study, the geopolymer prepared by fly ash, a kind of power plant waste, is used to cure the heavy metal Pb<sup>2+</sup>, and to investigate the effect of different concentrations of Pb<sup>2+</sup> on the compressive strength of the solidified body at different ages; the curing effect is judged by the toxic leaching concentration of heavy metals; the resistance of the solidified body to immersion is evaluated by comparing the change in strength before and after leaching; the fly ash-based geopolymer solidified body is compared with the cement solidified body in terms of curing effectiveness; the properties of the geopolymer and its mechanism of curing heavy metals are explored by microscopic tests. The results show that the fly ash-based geopolymer solidified body has good resistance to immersion; the optimum curing concentration of Pb<sup>2+</sup> in fly ash-based geopolymers is 2.0%; compared to pure geopolymers, the strength of the solidified body at 28 d decreases by only 13.0%, and the leaching concentration of Pb<sup>2+</sup> is 4.73 mg·L<sup>−1</sup>, which meets the specification requirements; the curing effect of the fly ash-based geopolymer is better than the cement solidified body; the microscopic test results indicate that the curing of Pb<sup>2+</sup> by the fly ash-based geopolymer is a combination of both chemical bonding and physical fixation.
format	article
author	Fang Liu Ran Tang Baomin Wang Xiaosa Yuan
author_facet	Fang Liu Ran Tang Baomin Wang Xiaosa Yuan
author_sort	Fang Liu
title	Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers
title_short	Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers
title_full	Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers
title_fullStr	Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers
title_full_unstemmed	Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers
title_sort	experimental study on solidification of pb<sup>2+</sup> in fly ash-based geopolymers
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/7f18727318cb4a4d8845c0743d359a33
work_keys_str_mv	AT fangliu experimentalstudyonsolidificationofpbsup2supinflyashbasedgeopolymers AT rantang experimentalstudyonsolidificationofpbsup2supinflyashbasedgeopolymers AT baominwang experimentalstudyonsolidificationofpbsup2supinflyashbasedgeopolymers AT xiaosayuan experimentalstudyonsolidificationofpbsup2supinflyashbasedgeopolymers
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Experimental Study on Solidification of Pb<sup>2+</sup> in Fly Ash-Based Geopolymers

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