Preparation of Silver‐Modified Nickel Foams by Galvanic Displacement and Their Use as Cathodes for the Reductive Dechlorination of Herbicides. Issue 12 (7th July 2016)

• Record Type: Journal Article
• Authors: Verlato, Enrico; He, Wenyan; Amrane, Abdeltif; Barison, Simona; Floner, Didier; Fourcade, Florence; Geneste, Florence; Musiani, Marco; Seraglia, Roberta
• Is Part Of: ChemElectroChem. Volume 3:Issue 12(2016)
• Page Start: 2084
• Page End: 2092
• Publication Date: 2016-07-07
• Subjects: electrochemistry -- environmental chemistry -- nickel -- silver -- synthesis design; Electrochemistry -- Periodicals; 541.37
• DOI: 10.1002/celc.201600214
• Languages: English
• ISSNs: 2196-0216

Abstract

Abstract: New 3D electrodes are prepared and tested in reductive herbicide dechlorination as the first step of an environmental remediation process. Commercial nickel foams are modified through the spontaneous deposition of silver nanoparticles. Some of the solutions of Ag + ions employed in the galvanic displacement reactions contain complexing agents, such as thiosulfate or thiocyanate, and a capping agent, polyvinylpyrrolidone (PVP), which influences the morphology and growth kinetics of the silver deposits. Modified foams are used as cathodes for the reductive dechlorination of Alachlor TM, a common chloroacetanilide herbicide, in a series of tests that confirm the catalytic activity of silver. Electrodes prepared in a thiosulfate solution containing PVP allow extensive reduction of Alachlor TM to give deschloroalachlor as the only dechlorinated product. Abstract : Herbicide dechlorination : Polluting chloroacetanilide herbicides require pre‐treatment to become suitable for biodegradation. Electrodes, prepared by spontaneous deposition of silver nanoparticles onto commercial nickel foams in solutions of thiosulfate containing polyvinylpyrrolidone, allow extensive reduction of Alachlor TM, yielding deschloroalachlor as the only dechlorinated product (see figure).