Photo-Fenton degradation of the herbicide 2,4-D in aqueous medium at pH conditions close to neutrality

Conte, Leandro; Schenone, Agustina Violeta; Alfano, Orlando Mario

doi:10.1016/j.jenvman.2016.01.002

Cited by 54 publications

(21 citation statements)

References 39 publications

(57 reference statements)

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“…Hydroxyl radical ( • OH), a powerful oxidant (E0=2.7 V) [6], is the main oxidative agent in AOPs. There are several techniques used for generating the hydroxyl radical, including chemical, photochemical, sonochemical, and electrochemical processes [7][8][9][10]. Presently, increasing attention has been paid to the anodic oxidation for degrading the environmental pollutants.…”

Section: Introductionmentioning

confidence: 99%

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Rabaaoui¹,

Kacem²,

Mohamed³

et al. 2017

Mod Chem Appl

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In this work, the removal of two pesticides 1, 2-dichlorobenzene and 1, 4-dichlorobenzene by electrolysis using BDD and Pb/PbO 2 as anodes is studied. Different operating conditions and factors affecting the treatment process including anode material, applied current density, supporting electrolyte and initial pH value were studied and optimized. Results demonstrate, as expected, that the influence of the anode material used on the degradation of pesticides was very significant in all cases. Infact electrolysis with diamond electrodes can attain the complete depletion of the pesticide and its mineralization faster than with PbO 2 anode. Electrolysis experiments strongly improves that the complete degradation of pesticides occurred in the presence of Na 2 SO 4 as conductive electrolyte at current density equals 20 mA cm -2 . Acidic pH would accelerate dichlorobenzene degradation, whereas alkaline condition showed negative effects. The disappearance of the pesticides followed a pseudo-first-order kinetics. Reversed-phase chromatography allows detecting Catechol, 2-chlorophenol and Pyrogallol as primary aromatic intermediates of 1,2-DCB and Hydroquinone, Benzoquinone and 4-chlorophenol for 1,4-DCB. Dechlorination of these products gives chloride ions Cl -. Ion-exclusion chromatography reveals the presence of maleic, formic, fumaric, malonic, glyoxylic, acetic and oxalic acid. An oxidation mechanism is proposed in agreement with other works shown in the literature.

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Section: Introductionmentioning

confidence: 99%

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Rabaaoui¹,

Kacem²,

Mohamed³

et al. 2017

Mod Chem Appl

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“…Nevertheless, it has some disadvantages, such as high cost and the loss of adsorption efficiency after regeneration . Therefore, it is necessary to find alternative methods because the conventional treatments are not sufficiently effective or economical in removing dyes …”

Section: Introductionmentioning

confidence: 99%

“…2 Therefore, it is necessary to find alternative methods because the conventional treatments are not sufficiently effective or economical in removing dyes. 10 Advanced oxidation processes (AOPs) are promising substitute technologies for the efficient elimination of recalcitrant pollutants that have high chemical stability and low biodegradability in wastewater. 11,12 At near-ambient temperature and pressures, most AOPs are characterized by the generation of oxidizing radical species such as hydroxyl radicals (•OH).…”

Section: Introductionmentioning

confidence: 99%

Synthesis of an inorganic‐framework molecularly imprinted Fe‐doped TiO₂ composite and its selective photo‐Fenton‐like degradation of acid orange II

Song

Rong

Shang

et al. 2017

J of Chemical Tech & Biotech

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BACKGROUND The heterogeneous photo‐Fenton‐like process is emerging as a promising treatment of dye‐containing wastewater because of its economic feasibility and high efficiency. However, it is still required to develop photo‐Fenton‐like catalysts with highly selective degradation ability and reusability. RESULTS Inorganic‐framework molecularly imprinted Fe‐doped TiO2 composites (MIP/Fe–TiO2) were successfully prepared by the sol–gel method, with acid orange II as the template and TiO2 as the matrix material. The photo‐Fenton‐like catalysts were characterized using FESEM, EDS, BET, X‐ray diffraction, FT‐IR spectroscopy and UV–vis diffuse reflectance spectroscopy. These methods revealed the well‐crystallized anatase phase and good nanometer‐level particle sizes. The adsorption property and photo‐Fenton‐like activity of the catalysts were also studied in single and binary systems, respectively. CONCLUSIONS Compared with non‐imprinted Fe–TiO2 composites (NIP/Fe–TiO2), MIP/Fe–TiO2 showed higher adsorption capacity and selectivity toward the template molecule. In addition, it was found that the molecular recognition ability of MIP/Fe–TiO2 provided the catalysts with rapidly selective photo‐Fenton‐like degradation of low target pollutant levels (20 mg L−1) in the presence of high levels of interferential pollutant sodium dodecyl benzene sulfonate (100 mg L−1). Moreover, because of the stable physicochemical properties of the inorganic framework, the new photo‐Fenton‐like catalysts were resistant to photochemical attack and showed favorable reusability. © 2017 Society of Chemical Industry

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“…[17][18][19][20] One of the advantages of some of these complexes, such as oxalate and citrate, 17,18,21 lies in the ability to absorb radiation, particularly in the visible, with expressive quantum yields. 18,22 However, in some situations, the advantage of using iron complexes is limited by the fact that certain target compounds form stable complexes with iron, which however are less active from the photocatalytic point of view. 10,18,21 Worth mentioning that during the classic Vol.…”

Section: Introductionmentioning

confidence: 99%

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

Silva¹,

Júnior²,

Silva³

et al. 2017

J. Braz. Chem. Soc.

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This study reports a protocol for the treatment of a sanitary landfill leachate through integration between a stage of coagulation-flocculation, a step of filtration of the resulting suspension, and application of the photo-Fenton process using a ferrioxalate complex and solar irradiation. The best results for turbidity removal by coagulation-flocculation were reached using Al 3+ as nitrate salt mainly using concentrations up close 4.4 mmol L -1 , at the natural pH of the effluent (pH 7.9), when the removal of 66% of the turbidity was achieved. By using a ferrioxalate complex after adjusting the pH of the effluent to 5, it was possible to circumvent the classical limitations of the Fenton process (related to the pH of the medium limited to between 2.5 and 3.0), performing a removal of 68% of the remaining dissolved organic carbon. The global dissolved organic carbon removal in this process was of 86% after a membrane filtration step before the photo-Fenton process.

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Photo-Fenton degradation of the herbicide 2,4-D in aqueous medium at pH conditions close to neutrality

Cited by 54 publications

References 39 publications

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Synthesis of an inorganic‐framework molecularly imprinted Fe‐doped TiO₂ composite and its selective photo‐Fenton‐like degradation of acid orange II

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

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Photo-Fenton degradation of the herbicide 2,4-D in aqueous medium at pH conditions close to neutrality

Cited by 54 publications

References 39 publications

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Anodic Oxidation of Chlorinated Pesticides on BDD and PbO2 Electrodes: Kinetics, Influential Factors and Mechanism Determination

Synthesis of an inorganic‐framework molecularly imprinted Fe‐doped TiO2 composite and its selective photo‐Fenton‐like degradation of acid orange II

Strategy for Treating a Landfill Leachate by Integration of Physico-Chemical and Photo-Fenton Processes

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Synthesis of an inorganic‐framework molecularly imprinted Fe‐doped TiO₂ composite and its selective photo‐Fenton‐like degradation of acid orange II