Cargando…

Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag

CaO derived naturally from limestone or dolomite is an inexpensive and widely available sorbent. Understanding the mechanisms of CaO carbonation at ambient temperature under the assistance of H(2)O is important for predicting the reaction of CaO in complex environments and designing novel CaO materi...

Descripción completa

Detalles Bibliográficos
Autores principales: Zheng, Hao, He, Yan, Zhu, Yuqing, Liu, Leping, Cui, Xuemin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: The Royal Society of Chemistry 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8696962/
https://www.ncbi.nlm.nih.gov/pubmed/35423813
http://dx.doi.org/10.1039/d1ra01353j
_version_ 1784619937161019392
author Zheng, Hao
He, Yan
Zhu, Yuqing
Liu, Leping
Cui, Xuemin
author_facet Zheng, Hao
He, Yan
Zhu, Yuqing
Liu, Leping
Cui, Xuemin
author_sort Zheng, Hao
collection PubMed
description CaO derived naturally from limestone or dolomite is an inexpensive and widely available sorbent. Understanding the mechanisms of CaO carbonation at ambient temperature under the assistance of H(2)O is important for predicting the reaction of CaO in complex environments and designing novel CaO materials. In this study, we found that the reaction rate of alkali-activated slag is controlled by the CaCO(3) layer on a partially carbonized CaO alkali activator. The size of the sorbent increased after the adsorption reaction and the physically adsorbed water in the pores accelerated the carbonation. The carbonation process was governed by CO(2) diffusion. When the carbonation conversion rate reached 2–6%, the setting time increased rapidly with the increase in the carbonation rate. This is because the surface of the activator was modified by the thickened CaCO(3) product layer, which increased the diffusional resistance and thus prolonged the setting time of the alkali-activated slag.
format Online
Article
Text
id pubmed-8696962
institution National Center for Biotechnology Information
language English
publishDate 2021
publisher The Royal Society of Chemistry
record_format MEDLINE/PubMed
spelling pubmed-86969622022-04-13 Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag Zheng, Hao He, Yan Zhu, Yuqing Liu, Leping Cui, Xuemin RSC Adv Chemistry CaO derived naturally from limestone or dolomite is an inexpensive and widely available sorbent. Understanding the mechanisms of CaO carbonation at ambient temperature under the assistance of H(2)O is important for predicting the reaction of CaO in complex environments and designing novel CaO materials. In this study, we found that the reaction rate of alkali-activated slag is controlled by the CaCO(3) layer on a partially carbonized CaO alkali activator. The size of the sorbent increased after the adsorption reaction and the physically adsorbed water in the pores accelerated the carbonation. The carbonation process was governed by CO(2) diffusion. When the carbonation conversion rate reached 2–6%, the setting time increased rapidly with the increase in the carbonation rate. This is because the surface of the activator was modified by the thickened CaCO(3) product layer, which increased the diffusional resistance and thus prolonged the setting time of the alkali-activated slag. The Royal Society of Chemistry 2021-03-30 /pmc/articles/PMC8696962/ /pubmed/35423813 http://dx.doi.org/10.1039/d1ra01353j Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/
spellingShingle Chemistry
Zheng, Hao
He, Yan
Zhu, Yuqing
Liu, Leping
Cui, Xuemin
Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag
title Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag
title_full Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag
title_fullStr Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag
title_full_unstemmed Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag
title_short Novel procedure of CO(2) capture of the CaO sorbent activator on the reaction of one-part alkali-activated slag
title_sort novel procedure of co(2) capture of the cao sorbent activator on the reaction of one-part alkali-activated slag
topic Chemistry
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8696962/
https://www.ncbi.nlm.nih.gov/pubmed/35423813
http://dx.doi.org/10.1039/d1ra01353j
work_keys_str_mv AT zhenghao novelprocedureofco2captureofthecaosorbentactivatoronthereactionofonepartalkaliactivatedslag
AT heyan novelprocedureofco2captureofthecaosorbentactivatoronthereactionofonepartalkaliactivatedslag
AT zhuyuqing novelprocedureofco2captureofthecaosorbentactivatoronthereactionofonepartalkaliactivatedslag
AT liuleping novelprocedureofco2captureofthecaosorbentactivatoronthereactionofonepartalkaliactivatedslag
AT cuixuemin novelprocedureofco2captureofthecaosorbentactivatoronthereactionofonepartalkaliactivatedslag