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...
Autores principales: | , , , , |
---|---|
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 |