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Colorimetric detection and adsorption of mercury using silver nanoparticles: A bibliographic and patent review

Author(s):

Fernanda Pilaquinga*, Jeroni Morey, Miguel Vivas-Rodríguez, Gabriela Yánez-Jácome, Lenys Fernández and María de las Nieves Piña   Pages 1 - 21 ( 21 )

Abstract:


Mercury (Hg) contamination is a problem that currently affects not only the environment but also human health. Various types of commercial adsorbents have been proposed for its removal. Silver is a noble element that can chemically adsorb mercury, forming amalgams. However, its use as an adsorbent presents the following disadvantages: rapid surface saturation and high cost. These limitations can easily be overcome using silver nanoparticles (AgNPs). With a size of less than 100 nm, their reactivity, their high surface area, and a minimal amount of metallic precursor, they are ideal candidates for mercury removal. This study presents a compendium of the use of conventional mercury adsorbents and the use of AgNPs for their colorimetric detection and removal in different matrices, in both the aqueous and gas phases of Hg0 and Hg2+ . In addition, the number of patents available in each case is analyzed. AgNPs as colorimetric sensors allow for quick detection of mercury in-situ. Additionally, the adsorption systems formed with AgNPs, allow for the obtaining of stable and chemically inert complexes, facilitating their recycling. It is concluded that the use of AgNPs is particularly efficient for the detection and removal of mercury, presenting a removal percentage of over 90%. As a result of the patents analyzed, its use is perfectly applicable at an industrial level.

Keywords:

Mercury, silver, adsorption, nanoparticles and sensor

Affiliation:

Department of Chemistry, University of the Balearic Islands, Cra. de Valldemossa Km. 7.5 07122, Palma de Mallorca, Department of Chemistry, University of the Balearic Islands, Cra. de Valldemossa Km. 7.5 07122, Palma de Mallorca, School of Chemistry Sciences, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre 1076, Apartado 17-01-2184, Quito, Centro de Estudios Aplicados en Química, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre 1076, Apartado 17-01-2184, Quito, School of Chemistry Sciences, Pontificia Universidad Católica del Ecuador, Av. 12 de Octubre 1076, Apartado 17-01-2184, Quito, Department of Chemistry, University of the Balearic Islands, Cra. de Valldemossa Km. 7.5 07122, Palma de Mallorca



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