Surface Interactions between Gold Nanoparticles and Biochar

Abstract Engineered nanomaterials are directly applied to the agricultural soils as a part of pesticide/fertilize formulations or sludge/manure amendments. No prior reports are available to understand the surface interactions between gold nanoparticles (nAu) and soil components, including the charco...

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Autores principales:	Minori Uchimiya, Joseph J. Pignatello, Jason C. White, Szu-Lung Hu, Paulo J. Ferreira
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/41094107fc564af4a2129fa552fb752b
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spelling	oai:doaj.org-article:41094107fc564af4a2129fa552fb752b2021-12-02T15:05:44ZSurface Interactions between Gold Nanoparticles and Biochar10.1038/s41598-017-03916-12045-2322https://doaj.org/article/41094107fc564af4a2129fa552fb752b2017-07-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-03916-1https://doaj.org/toc/2045-2322Abstract Engineered nanomaterials are directly applied to the agricultural soils as a part of pesticide/fertilize formulations or sludge/manure amendments. No prior reports are available to understand the surface interactions between gold nanoparticles (nAu) and soil components, including the charcoal black carbon (biochar). Retention of citrate-capped nAu on 300–700 °C pecan shell biochars occurred rapidly and irreversibly even at neutral pH where retention was less favorable. Uniform organic (primarily citrate ligands) layer on nAu was observable by TEM, and was preserved after the retention by biochar, which resulted in the aggregation or alignment along the edges of multisheets composing biochar. Retention of nAu was (i) greater on biochars than a sandy loam soil, (ii) greater at higher ionic strength and lower pH, and (iii) pyrolysis temperature-dependent: 500 < 700 ≪ 300 °C at pH 3. Collectively, carboxyl-enriched 300 °C biochar likely formed strong hydrogen bonds with the citrate layer of nAu. The charge transfer between the conduction band of nAu and π* continuum of polyaromatic sheets is likely to dominate on 700 °C biochar. Surface area-normalized retention of nAu on biochars was several orders of magnitude higher than negatively charged hydroxyl-bearing environmental surfaces, indicating the importance of black carbon in the environmental fate of engineered nanomaterials.Minori UchimiyaJoseph J. PignatelloJason C. WhiteSzu-Lung HuPaulo J. FerreiraNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Minori Uchimiya Joseph J. Pignatello Jason C. White Szu-Lung Hu Paulo J. Ferreira Surface Interactions between Gold Nanoparticles and Biochar
description	Abstract Engineered nanomaterials are directly applied to the agricultural soils as a part of pesticide/fertilize formulations or sludge/manure amendments. No prior reports are available to understand the surface interactions between gold nanoparticles (nAu) and soil components, including the charcoal black carbon (biochar). Retention of citrate-capped nAu on 300–700 °C pecan shell biochars occurred rapidly and irreversibly even at neutral pH where retention was less favorable. Uniform organic (primarily citrate ligands) layer on nAu was observable by TEM, and was preserved after the retention by biochar, which resulted in the aggregation or alignment along the edges of multisheets composing biochar. Retention of nAu was (i) greater on biochars than a sandy loam soil, (ii) greater at higher ionic strength and lower pH, and (iii) pyrolysis temperature-dependent: 500 < 700 ≪ 300 °C at pH 3. Collectively, carboxyl-enriched 300 °C biochar likely formed strong hydrogen bonds with the citrate layer of nAu. The charge transfer between the conduction band of nAu and π* continuum of polyaromatic sheets is likely to dominate on 700 °C biochar. Surface area-normalized retention of nAu on biochars was several orders of magnitude higher than negatively charged hydroxyl-bearing environmental surfaces, indicating the importance of black carbon in the environmental fate of engineered nanomaterials.
format	article
author	Minori Uchimiya Joseph J. Pignatello Jason C. White Szu-Lung Hu Paulo J. Ferreira
author_facet	Minori Uchimiya Joseph J. Pignatello Jason C. White Szu-Lung Hu Paulo J. Ferreira
author_sort	Minori Uchimiya
title	Surface Interactions between Gold Nanoparticles and Biochar
title_short	Surface Interactions between Gold Nanoparticles and Biochar
title_full	Surface Interactions between Gold Nanoparticles and Biochar
title_fullStr	Surface Interactions between Gold Nanoparticles and Biochar
title_full_unstemmed	Surface Interactions between Gold Nanoparticles and Biochar
title_sort	surface interactions between gold nanoparticles and biochar
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/41094107fc564af4a2129fa552fb752b
work_keys_str_mv	AT minoriuchimiya surfaceinteractionsbetweengoldnanoparticlesandbiochar AT josephjpignatello surfaceinteractionsbetweengoldnanoparticlesandbiochar AT jasoncwhite surfaceinteractionsbetweengoldnanoparticlesandbiochar AT szulunghu surfaceinteractionsbetweengoldnanoparticlesandbiochar AT paulojferreira surfaceinteractionsbetweengoldnanoparticlesandbiochar
_version_	1718388698710540288

Surface Interactions between Gold Nanoparticles and Biochar

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