Ni-coated graphite felt modified with Ag nanoparticles: A new electrode material for electro-reductive dechlorination

Reductive removal of the organochlorine herbicide alachlor on Ni-coated graphite felt modified with Ag nanoparticles (Ag/Ni@GF) was studied. Ag/Ni@GF was prepared by spontaneous deposition of silver onto Ni-coated graphite felt (Ni@GF), which was previously obtained by electrodeposition of Ni onto g...

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Published in:Journal of electroanalytical chemistry (Lausanne, Switzerland) Switzerland), 2019-09, Vol.849, p.113357, Article 113357
Main Authors: Lou, Yao-Yin, He, Wenyan, Verlato, Enrico, Musiani, Marco, Floner, Didier, Fourcade, Florence, Amrane, Abdeltif, Li, Chaoyu, Tian, Zhong-Qun, Merdrignac-Conanec, Odile, Coulon, Nathalie, Geneste, Florence
Format: Article
Language:English
Subjects:
Ag nanoparticle
Alachlor
Catalytic activity
Chemical Sciences
Coated electrodes
Current efficiency
Dechlorination
Electrocatalytic reduction
Electrode materials
Engineering Sciences
Graphite
Graphite felt
Herbicides
Nanoparticles
Organochlorine compound
Raman spectra
Silver
Sodium hydroxide
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Summary:Reductive removal of the organochlorine herbicide alachlor on Ni-coated graphite felt modified with Ag nanoparticles (Ag/Ni@GF) was studied. Ag/Ni@GF was prepared by spontaneous deposition of silver onto Ni-coated graphite felt (Ni@GF), which was previously obtained by electrodeposition of Ni onto graphite felt (GF). Interestingly, Ag/Ni@GF exhibited a high specific surface area of 26 m2 g−1 determined by the Brunauer-Emmett-Teller (BET) method and a high Ag loading of 13.7 mg cm−3 as shown by electrochemical analyses. Alachlor (50 mg L−1 in 0.05 M NaOH) was successfully reduced at −0.9 V vs. mercury-mercurous sulfate electrode with 96% conversion efficiency and a current efficiency up to 33%. The main by-product was its dechlorinated derivative, deschloroalachlor, obtained with 76% yield. Surface-enhanced Raman scattering (SERS) showed that PVP, necessary to control Ag nanoparticles deposition, does not affect the catalytic activity of Ag. Ag/Ni@GF electrodes could be used several times, highlighting their good stability. [Display omitted] •Spontaneous deposition of Ag nanoparticles on Ni-coated graphite felt was performed.•The modified electrode exhibits a high specific surface area and a high Ag loading.•The reductive dechlorination of alachlor was performed with good selectivity.•The modified electrode shows a remarkable stability after several electrolyses.
ISSN:1572-6657
1873-2569
DOI:10.1016/j.jelechem.2019.113357