Comparative Degradation of Alachlor Using Photocatalysis and Photo-Fenton

Pérez, Margarita Hincapié; Vega, Lina Patricia; Zúñiga-Benítez, Henry; Peñuela, Gustavo A.

doi:10.1007/s11270-018-3996-6

Cited by 12 publications

(6 citation statements)

References 17 publications

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“…Alachlor, 2-chloro-(2',6'-diethyl-N-(methoxymethyl)acetanilide), has been one of the mostly used herbicides to remove annual grasses and broadleaf weeds and promote crops yield in the last few decades [1,2]. The excess use of alachlor has led to contaminations in surface water and farming soil [3]. Alachlor and some of its metabolites have also been detected in vitro in human liver microsomes and in urine [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…A c c e p t e d m a n u s c r i p t 3 Various kinds of techniques have been put forward to remove alachlor from aquatic environment. Advanced oxidation processes (AOPs) have attracted considerable interests owing to the generated reactive oxidant radicals •OH, especially the Fenton reaction (equation (1)) combined with UV [16] or sonication [17], the peroxone process [18], photocatalysis [3,19,20] and electrochemical processes [21]. Among AOPs, electro-Fenton (EF) was considered in this study because of its advantage of self-generation of H2O2 by reduction of O2 (E° = 0.695 V/SHE), as shown in equation (2), which avoids the transportation and storage of H2O2.…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

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

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“…This is because H 2 O 2 absorbs photogenerated electrons and generates hydroxyl radical intermediates. Reports of a comparative study between the photocatalysis and photo-Fenton processes for the treatment of wastewaters were found in the literature and are mentioned in Table 4 (Kosogina et al, 2014;Malato et al, 2001Malato et al, , 2002Maldonado et al, 2007;Pérez et al, 2018).…”

Section: Photo-fentonmentioning

confidence: 99%

A review on pesticide degradation from irrigation water and techno‐economic feasibility of treatment technologies

Mule

Doltade

Pandit

2021

Water Environment Research

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The present study focuses and assures the need for pesticide degradation from various water bodies used for irrigation and the available technologies to treat them effectively. A thorough review of the literature is done on pesticide residues present in various irrigation water sources like rivers, groundwater, river sediments, and soil which signifies the existence of pesticides in the ecosystem.This indicates the severity of water pollution due to various sources around and their adverse effect on the ecosystem. However, several technologies are available to treat these pesticides based on the classification. A Cross comparison between the technologies is done to determine the efficient technology for the treatment of irrigation water.

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“…2 Considering that the chlorine atom(s) in these compounds is responsible for that toxicity, electrochemical reductive dechlorination has attracted increasing attention. Compared to coagulation–sedimentation–filtration, 3 biological treatment, 4 physical adsorption, 5 photochemical catalysis, 6 and wet catalytic oxidation, 7 electrochemical reductive dechlorination is more efficient and environmentally friendly, since the electrocatalysts can selectively remove Cl atom(s) using electrons as a green reductant, without the addition of other chemical agents.…”

Section: Introductionmentioning

confidence: 99%

High activity of step sites on Pd nanocatalysts in electrocatalytic dechlorination

Lou

Chi

Fang

et al. 2022

Phys. Chem. Chem. Phys.

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Comparative Degradation of Alachlor Using Photocatalysis and Photo-Fenton

Cited by 12 publications

References 17 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

A review on pesticide degradation from irrigation water and techno‐economic feasibility of treatment technologies

High activity of step sites on Pd nanocatalysts in electrocatalytic dechlorination

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