Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law

Abstract Solid iron corrosion products (FeCPs), continuously generated from iron corrosion in Fe0-based permeable reactive barriers (PRB) at pH > 4.5, can lead to significant porosity loss and possibility of system’s failure. To avoid such failure and to estimate the long-term performance of PRBs...

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Autores principales:	Huichen Yang, Rui Hu, Hans Ruppert, Chicgoua Noubactep
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/becc6ec7345743b6bcc4fa4d7bb96d13
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spelling	oai:doaj.org-article:becc6ec7345743b6bcc4fa4d7bb96d132021-12-02T15:10:34ZModeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law10.1038/s41598-021-96599-82045-2322https://doaj.org/article/becc6ec7345743b6bcc4fa4d7bb96d132021-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-96599-8https://doaj.org/toc/2045-2322Abstract Solid iron corrosion products (FeCPs), continuously generated from iron corrosion in Fe0-based permeable reactive barriers (PRB) at pH > 4.5, can lead to significant porosity loss and possibility of system’s failure. To avoid such failure and to estimate the long-term performance of PRBs, reliable models are required. In this study, a mathematical model is presented to describe the porosity change of a hypothetical Fe0-based PRB through-flowed by deionized water. The porosity loss is solely caused by iron corrosion process. The new model is based on Faraday’s Law and considers the iron surface passivation. Experimental results from literature were used to calibrate the parameters of the model. The derived iron corrosion rates (2.60 mmol/(kg day), 2.07 mmol/(kg day) and 1.77 mmol/(kg day)) are significantly larger than the corrosion rate used in previous modeling studies (0.4 mmol/(kg day)). This suggests that the previous models have underestimated the impact of in-situ generated FeCPs on the porosity loss. The model results show that the assumptions for the iron corrosion rates on basis of a first-order dependency on iron surface area are only valid when no iron surface passivation is considered. The simulations demonstrate that volume-expansion by Fe0 corrosion products alone can cause a great extent of porosity loss and suggests careful evaluation of the iron corrosion process in individual Fe0-based PRB.Huichen YangRui HuHans RuppertChicgoua NoubactepNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Huichen Yang Rui Hu Hans Ruppert Chicgoua Noubactep Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law
description	Abstract Solid iron corrosion products (FeCPs), continuously generated from iron corrosion in Fe0-based permeable reactive barriers (PRB) at pH > 4.5, can lead to significant porosity loss and possibility of system’s failure. To avoid such failure and to estimate the long-term performance of PRBs, reliable models are required. In this study, a mathematical model is presented to describe the porosity change of a hypothetical Fe0-based PRB through-flowed by deionized water. The porosity loss is solely caused by iron corrosion process. The new model is based on Faraday’s Law and considers the iron surface passivation. Experimental results from literature were used to calibrate the parameters of the model. The derived iron corrosion rates (2.60 mmol/(kg day), 2.07 mmol/(kg day) and 1.77 mmol/(kg day)) are significantly larger than the corrosion rate used in previous modeling studies (0.4 mmol/(kg day)). This suggests that the previous models have underestimated the impact of in-situ generated FeCPs on the porosity loss. The model results show that the assumptions for the iron corrosion rates on basis of a first-order dependency on iron surface area are only valid when no iron surface passivation is considered. The simulations demonstrate that volume-expansion by Fe0 corrosion products alone can cause a great extent of porosity loss and suggests careful evaluation of the iron corrosion process in individual Fe0-based PRB.
format	article
author	Huichen Yang Rui Hu Hans Ruppert Chicgoua Noubactep
author_facet	Huichen Yang Rui Hu Hans Ruppert Chicgoua Noubactep
author_sort	Huichen Yang
title	Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law
title_short	Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law
title_full	Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law
title_fullStr	Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law
title_full_unstemmed	Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law
title_sort	modeling porosity loss in fe0-based permeable reactive barriers with faraday’s law
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/becc6ec7345743b6bcc4fa4d7bb96d13
work_keys_str_mv	AT huichenyang modelingporositylossinfe0basedpermeablereactivebarrierswithfaradayslaw AT ruihu modelingporositylossinfe0basedpermeablereactivebarrierswithfaradayslaw AT hansruppert modelingporositylossinfe0basedpermeablereactivebarrierswithfaradayslaw AT chicgouanoubactep modelingporositylossinfe0basedpermeablereactivebarrierswithfaradayslaw
_version_	1718387717541199872

Modeling porosity loss in Fe0-based permeable reactive barriers with Faraday’s law

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