Premium
Reductive dehalogenation of a chloroacetanilide herbicide in a flow electrochemical cell fitted with Ag‐modified Ni foams
Author(s) -
He Wenyan,
Lou Yaoyin,
Verlato Enrico,
Soutrel Isabelle,
Floner Didier,
Fourcade Florence,
Amrane Abdeltif,
Musiani Marco,
Geneste Florence
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5523
Subject(s) - alachlor , yield (engineering) , chemistry , electrochemistry , context (archaeology) , supporting electrolyte , catalysis , nuclear chemistry , electrode , materials science , organic chemistry , metallurgy , ecology , paleontology , atrazine , pesticide , biology
BACKGROUND The aim of this work is to adapt the electrochemical reduction of Alachlor™, using Ag‐modified Ni foam electrodes to environmental applications. In this context, preparative electrolyses of Alachlor™ were performed in a flow electrochemical cell in different electrolytic media. RESULTS The highest catalytic activity for the reduction of Alachlor™ was obtained in 0.05 mol L ‐1 NaOH, with a conversion yield of 93%. The dechlorination yield of Alachlor™ estimated from the Cl ‐ concentration was 77%, significantly lower than its conversion yield, but higher than the yield of deschloroalachlor (69%), the main dehalogenated by‐product, indicating the presence of other by‐products. CONCLUSIONS Total reduction of Alachlor™ was achieved in conditions adapted to environmental applications, showing that this process can be used for dechlorination treatment of Alachlor™ in aqueous media. Although a high dechlorination yield was obtained, biodegradability estimated from BOD 5 measurements remained low, showing that the C–Cl bond is not the only functional group that is responsible for the biorecalcitrance of Alachlor™. © 2017 Society of Chemical Industry