Heterogeneous electro-Fenton treatment: preparation, characterization and performance in groundwater pesticide removal

Iglesias, Olalla; Dios, M.A. Fernández de; Tavares, Teresa; Sanromán, Á.; Pazos, Mercedes Suárez

doi:10.1016/j.jiec.2014.12.044

Cited by 69 publications

(13 citation statements)

References 42 publications

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“…In recent years, great effort have been undertaken to develop active heterogeneous catalysts in order to promote Fenton chemistry. The heterogeneous system offers several advantages over its homogeneous counterpart, such as the prevention of sludge formation, the possibility of recycling the iron promoter and its easy separation [38,39].…”

Section: Fe (Oocr) 2+ + H ν ν ν ν Fe 2+ + Co 2 + R • (Eq 5)mentioning

confidence: 99%

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Hammouda

Fourcade

Assadi

et al. 2016

Applied Catalysis B: Environmental

110

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Fe-ABs were fabricated by simple gelation procedure at 25 °C. The incorporation of iron on beads was confirmed by EDS results. The Fe-ABs catalyst present good stability and can be used for at least four times without obvious decrease in activity. Mineralization pathways of indole was proposed. In this work the characterization and the performance of iron immobilized in alginate beads (Fe-ABs) as catalyst for heterogeneous electro-Fenton (EF) treatment of a malodorous compound, indole, was investigated. Experimental results demonstrated that indole was effectively removed through the electro-Fenton process; while in the considered experimental conditions, the performances of EF were only slightly improved by the addition of UVA radiation. The most efficient operating conditions were achieved at pH 3.0 in the presence of 200 mg.L-1 Fe-ABs catalyst (corresponding to an average iron concentration of 64 mg L-1) with a current density of 0.53 mA cm-2. Under these conditions, 60 min were sufficient to completely degrade 20 mg L −1 of indole, whose removal was found to obey the pseudo-first order model. In terms of organic carbon removal, about 90% mineralization yield was reached in the optimal conditions for 7 h heterogeneous electro-Fenton treatment time. UPLC-MS/MS analysis was applied to identify and follow the evolution of indole oxidation products. Five stable organics intermediates were observed and four of them were identified as dioxindole, isatin, oxindole and anthranilic acid. A reaction sequence was therefore proposed for indole degradation according to the detected products. Subsequent attack of these intermediates by •OH radicals led to the formation of short chain acids such as succinic, acetic, oxamic and oxalic identified by ion-exclusion chromatography.

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Section: Fe (Oocr) 2+ + H ν ν ν ν Fe 2+ + Co 2 + R • (Eq 5)mentioning

confidence: 99%

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Hammouda

Fourcade

Assadi

et al. 2016

Applied Catalysis B: Environmental

110

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“…On the other hand, the combination of two oxidation systems, ozonation and photocatalysis, for water treatment under optimal conditions are reported to have increased oxidation efficiencies (synergy) compared to the sum oxidation efficiencies of these two oxidation systems separately. [32][33][34][35][36] Several studies have discussed the synergistic effects of photocatalytic ozonation on degradation and removal of different substances from aqueous solutions and the effects are reported in terms of the degradation and/or mineralization efficiencies or oxidation rate constants of model water pollutants. [17][18][19][20][21][22][23][24][25][26][27] The efficiency of photocatalytic ozonation is mainly attributed to the formation of more reactive and non-selective hydroxyl radicals in the oxidation medium, which react with almost all organic molecules at a rate of 10 6 -10 9 M -1 s -1 .…”

Section: Effect Of Ph Influence On Imazapyr Degradationmentioning

confidence: 99%

Factors Influencing Imazapyr Herbicide Removal from Wastewater Using Photocatalytic Ozonation

Bougarrani

Azzouzi²,

Akel³

et al. 2018

ACSi

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This study investigates the degradation of imazapyr herbicide from wastewater by photocatalytic ozonation using TiO 2 as a semiconductor. Effects of operational parameters on imazapyr removal efficiency including TiO 2 dosing, initial herbicide concentration and pH were also studied. Obtained results showed that more than 90% of removal efficiency representing the disappearance of imazapyr was maintained until 7 µM in the presence of 200 mgL -1 of UV100-TiO 2 . Otherwise, the degradation of imazapyr followed the first-order kinetics with a photocatalytic rate constant of 0.247 min -1 , and complete degradation was achieved within 20 min using photocatalytic ozonation for 5 µM of Imazapyr at pH 7.

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“…Due to the hydrophobic nature of organic pollutants, their remediation has become a growing concern. Recently, researchers focused on to assess the probable harm of these pesticides and herbicides toward the earth's ecosystem and human health [1][2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Comparison of nanoscale zero-valent iron, fenton, and photo-fenton processes for degradation of pesticide 2,4-dichlorophenoxyacetic acid in aqueous solution

et al. 2019

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Nanoscale zero-valent iron (nZVI) products are highly applicable in groundwater, industrial water, and wastewater treatment due to the high reduction properties, the small size of particles in the range of nanometers, large surface area, and high reactivity on most toxic contaminants. The ultimate aim of this study is to evaluate the removal performance of 2,4-dichlorophenoxyacetic acid (2,4-D) by nanoscaled ZVI particles. Synthesized nanoscale iron particles were characterized by X-ray diffraction and scanning electron microscopy (SEM). According to SEM images of nZVI, the particle size was under 100 nm in diameter. The specific surface area was measured by the N 2 /BET method and determined as 44.7 ± 0.4 m 2 /g. The influences of nZVI dosage, initial pH and effects of different processes were examined by batch experiments. Results were compared with Fenton and photo-Fenton processes and they showed that under optimized conditions, degradation by nZVI is more effective than Fenton and photo-Fenton reactions and a promising candidate for 2,4-D remediation.

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Heterogeneous electro-Fenton treatment: preparation, characterization and performance in groundwater pesticide removal

Cited by 69 publications

References 42 publications

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Effective heterogeneous electro-Fenton process for the degradation of a malodorous compound, indole, using iron loaded alginate beads as a reusable catalyst

Factors Influencing Imazapyr Herbicide Removal from Wastewater Using Photocatalytic Ozonation

Comparison of nanoscale zero-valent iron, fenton, and photo-fenton processes for degradation of pesticide 2,4-dichlorophenoxyacetic acid in aqueous solution

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