A critical review of the application of chelating agents to enable Fenton and Fenton-like reactions at high pH values

Zhang, Ying; Zhou, Minghua

doi:10.1016/j.jhazmat.2018.09.035

Cited by 424 publications

(141 citation statements)

References 190 publications

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“…Although high degradation efficiencies have been reported at acidic condition for a variety of contaminants in Fenton reaction [17], when the pH value ranges from 1.6-7 the removal rate of COD and TOC has been increased and reached 91.62% and 79.23% at pH 7, respectively in actual urotropine wastewater (Fig. 2).…”

Section: Effect Of Solution Phmentioning

confidence: 93%

Degradation process and kinetics study of actual urotropine wastewater by Fenton method

Wang¹,

Liu²,

Zhang³

et al. 2019

Desalination and Water Treatment

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The degradation of actual urotropine wastewater was investigated by Fenton oxidation process. The effect of initial pH, dosages of Fe 2+ and H 2 O 2 , reaction time and temperature of reaction on chemical oxygen demand (COD) and total organic carbon (TOC) removal was analyzed. The optimal conditions for COD and TOC removal of urotropine wastewater were determined. When the pH = 7.0, H 2 O 2 /Fe 2+ dosage = 4, H 2 O 2 dosage = 16.5784 g/L, reaction temperature = 45°C, reaction time = 3 h were given, the removal of COD and TOC was 93.53% and 81.27%, respectively. The experimental results indicated that the removal efficiency was strongly dependent on initial pH, the concentration of Fenton reagents, time and temperature of the reaction. Second-order reaction kinetic model provides the best correlation of the data. Primary substances were identified by gas chromatography-mass spectrometry (GC-MS), and the possible reaction pathway was proposed based on the analysis in Fenton oxidation process. This study may lead as provide guidance to related industries treating the urotropine production wastewater by Fenton oxidation process.

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Section: Effect Of Solution Phmentioning

confidence: 93%

Degradation process and kinetics study of actual urotropine wastewater by Fenton method

Wang¹,

Liu²,

Zhang³

et al. 2019

Desalination and Water Treatment

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“…One of the main limitations of EF is that it operates optimally at acidic pH (around 3), which means that additional acidification and neutralization steps are required . Different options have been proposed to broaden the working pH of EF, including: i) the use of heterogeneous catalysts, either as suspended powders in the wastewater or coated on the surface of the electrode, and ii) the use of organic and inorganic ligands with the ability to form stable Fe coordination species that are soluble in the aqueous phase over a wide pH range ,. Organic ligands like EDTA, citrate, oxalic acid, etc.…”

Section: Introductionmentioning

confidence: 99%

“…OH, competing with the target pollutants for . OH oxidation and thus, diminishing the efficiency of the process ,. In the case of inorganic ligands, polyphosphate derivatives have recently emerged as potential options for Fenton‐based systems, including EF ,.…”

Section: Introductionmentioning

confidence: 99%

Near‐neutral Electro‐Fenton Treatment of Pharmaceutical Pollutants: Effect of Using a Triphosphate Ligand and BDD Electrode

et al. 2019

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In this work, a mixture of pharmaceutical pollutants was successfully treated by electro-Fenton (EF) at near-neutral pH using the inorganic ligand triphosphate (TPP). The effect of the ligand and the reactivity of its Fe complexes were thoroughly investigated under different conditions of TPP : Fe 2 + ratio, Fe 2 + and TPP concentrations, current density, and nature of the anode material (Ti/IrO 2 À RuO 2 and boron doped diamond, BDD). The mineralization of organics was mainly controlled by the EF reaction promoted by the continuous electrochemical formation of H 2 O 2 and regeneration of Fe 2 + (as Fe 2 + -TPP), while the main role of the ligand was to keep active Fe 2 + ions dissolved in solution to catalyze the Fenton's reaction at near-neutral pH. The results contrasted with previous works that reported the ability of Fe-TPP to enhance the oxidation performance of Fenton-like systems. Moreover, the remarkable oxidative properties of diamond electrodes enhanced the mineralization efficiency and TPP was not detrimental to oxidation with BDD. Finally, the degradation kinetics of all the compounds under investigation were determined, and a pathway for the antidepressant amitriptyline (ATTL) was proposed.* OH oxidation and thus, diminishing [a] Dr.

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“…However, drawbacks such as the requirement of a low pH and a significant amount of ferric hydroxide sludge formed during the treatment have limited its application in homogeneous medium. 3,4 Alternatively, heterogeneous Fenton systems based on solid iron phases and iron composite materials have been intensively studied to overcome the limitations of the homogeneous process. 1,5 The most important features of iron oxides, commonly reported in literature, are the high surface-area, magnetism, biocompatibility, natural occurrence and catalytic oxidizing capabilities.…”

Section: Introductionmentioning

confidence: 99%

Degradation of Acid Red 8 Dye Using Photo-Fenton Reaction Mediated by Titanium Modified Catalysts

Bento

Emídio

Hammer

et al. 2019

J. Braz. Chem. Soc.

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Catalysts prepared by co-precipitation of iron and titanium were evaluated in heterogeneous photo-Fenton degradation of the azo dye Acid Red 8 under blacklight irradiation. Materials with different titanium contents (0 < Ti/Fe < 0.6) were characterized using X-ray diffractometry, scanning electron microscopy, X-ray fluorescence spectroscopy, specific surface area and X-ray photoelectron spectroscopy. Hematite was identified as main phase in materials with lowest Ti content, while titanomaghemite was predominant at high Ti content. Highest degradation was obtained using titanium free catalyst due to iron leaching, which promoted a homogeneous reaction. Addition of Ti led to a heterogeneous process with a maximum when Ti/Fe = 0.40 achieving 0.76 mol of dye mineralized per mol of soluble iron after 90 min, using 10 mmol L-1 H 2 O 2 at pH 5.6, value at least three times higher than that observed for catalysts with lower Ti content. The results indicate that Ti stabilizes the catalyst and increases its heterogeneous activity in photo-Fenton process.

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A critical review of the application of chelating agents to enable Fenton and Fenton-like reactions at high pH values

Cited by 424 publications

References 190 publications

Degradation process and kinetics study of actual urotropine wastewater by Fenton method

Degradation process and kinetics study of actual urotropine wastewater by Fenton method

Near‐neutral Electro‐Fenton Treatment of Pharmaceutical Pollutants: Effect of Using a Triphosphate Ligand and BDD Electrode

Degradation of Acid Red 8 Dye Using Photo-Fenton Reaction Mediated by Titanium Modified Catalysts

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