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Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer
Passive sampling systems (PASs) are a low cost strategy to quantify Hg levels in air over both different environmental locations and time periods of few hours to weeks/months. For this reason, novel nanostructured materials have been designed and developed. They consist of an adsorbent layer made of...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6215095/ https://www.ncbi.nlm.nih.gov/pubmed/30301278 http://dx.doi.org/10.3390/nano8100798 |
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author | Macagnano, Antonella Papa, Paolo Avossa, Joshua Perri, Viviana Marelli, Marcello Sprovieri, Francesca Zampetti, Emiliano De Cesare, Fabrizio Bearzotti, Andrea Pirrone, Nicola |
author_facet | Macagnano, Antonella Papa, Paolo Avossa, Joshua Perri, Viviana Marelli, Marcello Sprovieri, Francesca Zampetti, Emiliano De Cesare, Fabrizio Bearzotti, Andrea Pirrone, Nicola |
author_sort | Macagnano, Antonella |
collection | PubMed |
description | Passive sampling systems (PASs) are a low cost strategy to quantify Hg levels in air over both different environmental locations and time periods of few hours to weeks/months. For this reason, novel nanostructured materials have been designed and developed. They consist of an adsorbent layer made of titania nanoparticles (TiO(2)NPs, ≤25 nm diameter) finely decorated with gold nanoparticles. The TiO(2)NPs functionalization occurred for the photocatalytic properties of titania-anatase when UV-irradiated in an aqueous solution containing HAuCl(4). The resulting nanostructured suspension was deposited by drop-casting on a thin quartz slices, dried and then incorporated into a common axial sampler to be investigated as a potential PAS device. The morphological characteristics of the sample were studied by High-Resolution Transmission Electron Microscopy, Atomic Force Microscopy, and Optical Microscopy. UV-Vis spectra showed a blue shift of the membrane when exposed to Hg(0) vapors. The adsorbed mercury was thermally desorbed for a few minutes, and then quantified by a mercury vapor analyzer. Such a sampling system reported an efficiency of adsorption that was equal to ≈95%. Temperature and relative humidity only mildly affected the membrane performances. These structures seem to be promising candidates for mercury samplers, due to both the strong affinity of gold with Hg, and the wide adsorbing surface. |
format | Online Article Text |
id | pubmed-6215095 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-62150952018-11-14 Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer Macagnano, Antonella Papa, Paolo Avossa, Joshua Perri, Viviana Marelli, Marcello Sprovieri, Francesca Zampetti, Emiliano De Cesare, Fabrizio Bearzotti, Andrea Pirrone, Nicola Nanomaterials (Basel) Article Passive sampling systems (PASs) are a low cost strategy to quantify Hg levels in air over both different environmental locations and time periods of few hours to weeks/months. For this reason, novel nanostructured materials have been designed and developed. They consist of an adsorbent layer made of titania nanoparticles (TiO(2)NPs, ≤25 nm diameter) finely decorated with gold nanoparticles. The TiO(2)NPs functionalization occurred for the photocatalytic properties of titania-anatase when UV-irradiated in an aqueous solution containing HAuCl(4). The resulting nanostructured suspension was deposited by drop-casting on a thin quartz slices, dried and then incorporated into a common axial sampler to be investigated as a potential PAS device. The morphological characteristics of the sample were studied by High-Resolution Transmission Electron Microscopy, Atomic Force Microscopy, and Optical Microscopy. UV-Vis spectra showed a blue shift of the membrane when exposed to Hg(0) vapors. The adsorbed mercury was thermally desorbed for a few minutes, and then quantified by a mercury vapor analyzer. Such a sampling system reported an efficiency of adsorption that was equal to ≈95%. Temperature and relative humidity only mildly affected the membrane performances. These structures seem to be promising candidates for mercury samplers, due to both the strong affinity of gold with Hg, and the wide adsorbing surface. MDPI 2018-10-07 /pmc/articles/PMC6215095/ /pubmed/30301278 http://dx.doi.org/10.3390/nano8100798 Text en © 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Macagnano, Antonella Papa, Paolo Avossa, Joshua Perri, Viviana Marelli, Marcello Sprovieri, Francesca Zampetti, Emiliano De Cesare, Fabrizio Bearzotti, Andrea Pirrone, Nicola Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer |
title | Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer |
title_full | Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer |
title_fullStr | Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer |
title_full_unstemmed | Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer |
title_short | Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO(2)NP/AuNP Layer |
title_sort | passive sampling of gaseous elemental mercury based on a composite tio(2)np/aunp layer |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6215095/ https://www.ncbi.nlm.nih.gov/pubmed/30301278 http://dx.doi.org/10.3390/nano8100798 |
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