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Nanomaterials 2018, 8(10), 798; https://doi.org/10.3390/nano8100798

Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO2NP/AuNP Layer

1
Institute of Atmospheric Pollution Research—National Research Council (IIA-CNR), Research Area of Rome 1, Via Salaria km 29,300, 00016 Monterotondo, Italy
2
Department of Innovation in Biological Systems, Food and Forestry University of Tuscia (DIBAF), Via S. Camillo de Lellis, 00100 Viterbo, Italy
3
Institute of Molecular Science and Technologies—National Research Council (ISTM-CNR), Via G. Fantoli 16/15, 20138 Milano, Italy
4
Institute of Atmospheric Pollution Research—National Research Council (IIA-CNR), Division of Rende, c/o UNICAL-Polifunzionale, 87036 Arcavacata di Rende (CS), Italy
*
Author to whom correspondence should be addressed.
Received: 6 September 2018 / Revised: 27 September 2018 / Accepted: 5 October 2018 / Published: 7 October 2018
(This article belongs to the Special Issue Design and Development of Nanostructured Thin Films)
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Abstract

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 (TiO2NPs, ≤25 nm diameter) finely decorated with gold nanoparticles. The TiO2NPs functionalization occurred for the photocatalytic properties of titania-anatase when UV-irradiated in an aqueous solution containing HAuCl4. 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 Hg0 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. View Full-Text
Keywords: TiO2NPs; AuNPs; photocatalysis; mercury vapors adsorbing layer; PAS device TiO2NPs; AuNPs; photocatalysis; mercury vapors adsorbing layer; PAS device
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Macagnano, A.; Papa, P.; Avossa, J.; Perri, V.; Marelli, M.; Sprovieri, F.; Zampetti, E.; De Cesare, F.; Bearzotti, A.; Pirrone, N. Passive Sampling of Gaseous Elemental Mercury Based on a Composite TiO2NP/AuNP Layer. Nanomaterials 2018, 8, 798.

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