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

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

doi:10.1016/j.jelechem.2019.113357

Cited by 23 publications

(17 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electrodechlorination processes were conducted as described in our previous work [13,14,27] chosen, because it has been shown to be the optimal pH for the Fenton's reaction [28]. All solutions were vigorously stirred (300 rpm) with a magnetic bar during treatment.…”

Section: Electrochemical Processmentioning

confidence: 99%

“…Since the BOD5/COD ratio is 0.16 after only 0.25 h of EF treatment on solution alachlor-ER , an increase of the biodegradability can be expected between 0.25 h and 0.5 h of electrolysis, as experimentally confirmed (Table 1). A charge of 2 kC/g of alachlor corresponding to an energy of 1.6 kWh/kg of alachlor is consumed to do the electroreduction of alachlor since the current efficiency has been previously estimated to be about 36 % [27]. Thus, ER-EF pretreatment could be interesting if the total energy that it consumed is lower than 29 kC/g alachlor, which corresponds to a time of 28 min for the EF treatment in these operating conditions.…”

Section: Energy Consumptionmentioning

confidence: 99%

See 1 more Smart Citation

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Lou

Geneste

Soutrel

et al. 2020

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

This study investigates alachlor herbicide removal by electro-Fenton (EF) process with and without a previous dechlorination step by electro-reduction (ER-EF). The objective is to evaluate the relevance of dechlorination before electro-Fenton according to the biodegradability evolution and the energy consumption. The influence of the applied current, the ferrous ions concentration and the air flow rate on the production of hydrogen peroxide and on the general behavior of alachlor removal by EF oxidation was studied and optimized EF conditions were chosen. Scavenger tests were performed to determine the contribution of hydroxyl radicals (•OH), superoxide radicals (•O2 -) and sulfate radicals ( • SO4 -) during alachlor degradation. Some intermediate products formed during degradation by EF of alachlor and of the electroreduced solution were identified and the evolution of small organic acids was examined. Possible pathways of alachlor degradation and of deschloroalachlor, the mean byproduct from ER, were proposed on the basis of the EF reaction. EF treatment significantly improved the biodegradability of electrolyzed solutions with BOD5/COD ratio increasing from 0 to 0.4 after 0.5 h oxidation and can be further enhanced by the application of ER prior to EF, leading to a maximum value for the BOD5/COD ratio of 0.7 that can be due to the absence of chloroacetic acid found during the EF treatment. The energy consumption of the different electrochemical processes was also evaluated.

show abstract

Section: Electrochemical Processmentioning

confidence: 99%

Section: Energy Consumptionmentioning

confidence: 99%

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Lou

Geneste

Soutrel

et al. 2020

Separation and Purification Technology

Self Cite

View full text Add to dashboard Cite

show abstract

“…Among them, electroreduction reaction can be considered as a green technique to treat pollutants since the addition of a chemical reducing agent is not required. It is also known as an economic and effective method due to its high selectivity for dehalogenation of organic halide pollutants (Fontmorin et al, 2014a ; He et al, 2016 , 2017 , 2018 ; Verlato et al, 2016 ; Lou et al, 2019 , 2020 ), allowing the recovery of iodide ions. Thus, the reductive deiodination of ICM has been applied for the removal of iopamidol with the aim to form controlled intermediates (Yan et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Electrochemical Processes Coupled to a Biological Treatment for the Removal of Iodinated X-ray Contrast Media Compounds

et al. 2020

Self Cite

View full text Add to dashboard Cite

show abstract

“…Furthermore, the high selectivity of the reaction on bismuth is noteworthy. Deschloroalachlor yield reached 96%, against 76% on Ni-coated graphite felt modified with silver nanoparticles 35 and 86% with a Co catalyst. 27-28…”

Section: Effect Of the Applied Potential On The Electroreduction Of Alachlor Since Alachlormentioning

confidence: 98%

Efficient Dechlorination of α-Halocarbonyl and α-Haloallyl Pollutants by Electroreduction on Bismuth

Lou

Hapiot

Floner

et al. 2019

Environ. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

The electrocatalytic activity of bismuth considered as a low cost and green electrode material was studied in reductive dechlorination processes. Cyclic voltammetry analyses showed that the Bi electrode exhibited a high catalytic activity to reduce alachlor, a chlorinated herbicide, in aqueous medium at different pH. Bulk electrolyses were performed at different potentials and pH. Alachlor was reduced in deschloroalachlor, its dechlorinated derivative, with a high selectivity (96%) and with a current efficiency of 48%. The reductive dechlorination of other chlorinated compounds with an activated carbon atom was then studied, showing that the bismuth electrode catalyzed the electroreduction of chloroacetamides, -halocarbonyl and haloallyl pollutants. Cyclic voltammetry experiments allowed us to propose a mechanism explaining the high catalytic activity of bismuth to reduce these families of compounds.

show abstract

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

Cited by 23 publications

References 35 publications

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Alachlor dechlorination prior to an electro-Fenton process: Influence on the biodegradability of the treated solution

Electrochemical Processes Coupled to a Biological Treatment for the Removal of Iodinated X-ray Contrast Media Compounds

Efficient Dechlorination of α-Halocarbonyl and α-Haloallyl Pollutants by Electroreduction on Bismuth

Contact Info

Product

Resources

About