Rapid screening of silver nanoparticles for the catalytic degradation of chlorinated pollutants in water

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Title: Rapid screening of silver nanoparticles for the catalytic degradation of chlorinated pollutants in water
Authors: Lugaresi, Ottavio | Perales-Rondón, Juan V. | Minguzzi, Alessandro | Solla-Gullón, José | Rondinini, Sandra | Feliu, Juan M. | Sánchez-Sánchez, Carlos M.
Research Group/s: Electroquímica de Superficies | Electroquímica Aplicada y Electrocatálisis
Center, Department or Service: Universidad de Alicante. Departamento de Química Física | Universidad de Alicante. Instituto Universitario de Electroquímica
Keywords: Dehalogenation | SECM | Trichloromethane | Screen-printed electrodes | Silver
Knowledge Area: Química Física
Issue Date: Feb-2015
Publisher: Elsevier
Citation: Applied Catalysis B: Environmental. 2015, 163: 554-563. doi:10.1016/j.apcatb.2014.08.030
Abstract: Electrochemical abatement of volatile polychlorinated organic compounds for environmental applications represents a very attractive and feasible alternative for working at mild reaction conditions and reduced costs. We present herein the synthesis of three different sized Ag nanoparticles (NPs) and their electrocatalytic performance in the degradation of a model pollutant (trichloromethane, CHCl3) in aqueous media. Two different methodologies are used: A conventional study based on voltammetry and chronoamperometry and a novel screening approach based on the micropipette delivery/substrate collection (MD/SC) mode of the scanning electrochemical microscopy (SECM). This new approach allows to dose any reactant, in this case CHCl3, even if the latter cannot be electrogenerated. Moreover, we introduce here a novel platform for studying nanomaterials by reducing the current collector background contribution using disposable screen-printed array electrodes. The performance ranking obtained by the SECM for the three different samples of Ag NPs synthesized is validated by its comparison with the results obtained by chronoamperometry, which demonstrates the feasibility and the good sensitivity of SECM in electrocatalysts screening for the CHCl3 reduction reaction. In addition, SECM allows to analyze simultaneously a large number of catalysts in one single experiment under constant experimental conditions. We suggest the proper size range and the presence of abundant superficial defective sites, such as steps or kinks, as the main reasons for Ag NPs C1 exhibiting the best overall catalytic performance in trichloromethane electrochemical reduction.
Sponsor: This work has been partially financed by the MICINN (Spain) (project CTQ2010-16271) and Generalitat Valenciana (projects PROMETEO/2009/045271 and GRISOLIA/2011/029). O.L. is thankful to Università degli Studi di Milano for his Ph.D. fellowship.
URI: http://hdl.handle.net/10045/40705
ISSN: 0926-3373 (Print) | 1873-3883 (Online)
DOI: 10.1016/j.apcatb.2014.08.030
Language: eng
Type: info:eu-repo/semantics/article
Peer Review: si
Publisher version: http://dx.doi.org/10.1016/j.apcatb.2014.08.030
Appears in Collections:INV - EQSUP - Artículos de Revistas
INV - LEQA - Artículos de Revistas

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