Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique

Abstract Biochar supported nanoscale zero-valent iron (NZVI/BC), prepared commonly by liquid reduction using sodium borohydride (NaBH4), exhibits better reduction performance for contaminants than bare NZVI. The better reducing ability was attributed to attachment of nanoscale zero-valent iron (NZVI...

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Autores principales:	Kun Yang, Jialu Xu, Ming Zhang, Daohui Lin
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b9f6600254d54449a03d64763335540d
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spelling	oai:doaj.org-article:b9f6600254d54449a03d64763335540d2021-12-02T13:30:11ZRe-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique10.1038/s41598-021-84685-w2045-2322https://doaj.org/article/b9f6600254d54449a03d64763335540d2021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-84685-whttps://doaj.org/toc/2045-2322Abstract Biochar supported nanoscale zero-valent iron (NZVI/BC), prepared commonly by liquid reduction using sodium borohydride (NaBH4), exhibits better reduction performance for contaminants than bare NZVI. The better reducing ability was attributed to attachment of nanoscale zero-valent iron (NZVI) on biochar (BC) surface or into the interior pores of BC particles due to observations by scanning electron microscopy (SEM) and plan transmission electron microscopy (P-TEM) techniques in previous studies. In this study, cross-sectional TEM (C-TEM) technique was employed firstly to explore location of NZVI in NZVI/BC. It was observed that NZVI is isolated from BC particles, but not located on the surface or in the interior pores of BC particles. This observation was also supported by negligible adsorption and precipitation of Fe2+/Fe3+ and iron hydroxides on BC surface or into interior pores of BC particles respectively. Precipitation of Fe2+ and Fe3+, rather than adsorption, is responsible for the removal of Fe2+ and Fe3+ by BC. Moreover, precipitates of iron hydroxides cannot be reduced to NZVI by NaBH4. In addition to SEM or P-TEM, therefore, C-TEM is a potential technique to characterize the interior morphology of NZVI/BC for better understanding the improved reduction performance of contaminants by NZVI/BC than bare NZVI.Kun YangJialu XuMing ZhangDaohui LinNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Kun Yang Jialu Xu Ming Zhang Daohui Lin Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique
description	Abstract Biochar supported nanoscale zero-valent iron (NZVI/BC), prepared commonly by liquid reduction using sodium borohydride (NaBH4), exhibits better reduction performance for contaminants than bare NZVI. The better reducing ability was attributed to attachment of nanoscale zero-valent iron (NZVI) on biochar (BC) surface or into the interior pores of BC particles due to observations by scanning electron microscopy (SEM) and plan transmission electron microscopy (P-TEM) techniques in previous studies. In this study, cross-sectional TEM (C-TEM) technique was employed firstly to explore location of NZVI in NZVI/BC. It was observed that NZVI is isolated from BC particles, but not located on the surface or in the interior pores of BC particles. This observation was also supported by negligible adsorption and precipitation of Fe2+/Fe3+ and iron hydroxides on BC surface or into interior pores of BC particles respectively. Precipitation of Fe2+ and Fe3+, rather than adsorption, is responsible for the removal of Fe2+ and Fe3+ by BC. Moreover, precipitates of iron hydroxides cannot be reduced to NZVI by NaBH4. In addition to SEM or P-TEM, therefore, C-TEM is a potential technique to characterize the interior morphology of NZVI/BC for better understanding the improved reduction performance of contaminants by NZVI/BC than bare NZVI.
format	article
author	Kun Yang Jialu Xu Ming Zhang Daohui Lin
author_facet	Kun Yang Jialu Xu Ming Zhang Daohui Lin
author_sort	Kun Yang
title	Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique
title_short	Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique
title_full	Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique
title_fullStr	Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique
title_full_unstemmed	Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique
title_sort	re-recognizing micro locations of nanoscale zero-valent iron in biochar using c-tem technique
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/b9f6600254d54449a03d64763335540d
work_keys_str_mv	AT kunyang rerecognizingmicrolocationsofnanoscalezerovalentironinbiocharusingctemtechnique AT jialuxu rerecognizingmicrolocationsofnanoscalezerovalentironinbiocharusingctemtechnique AT mingzhang rerecognizingmicrolocationsofnanoscalezerovalentironinbiocharusingctemtechnique AT daohuilin rerecognizingmicrolocationsofnanoscalezerovalentironinbiocharusingctemtechnique
_version_	1718392997867945984

Re-recognizing micro locations of nanoscale zero-valent iron in biochar using C-TEM technique

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