Could NOx be released during mineralization of pollutants containing nitrogen by hydroxyl radical? Ascertaining the release of N-volatile species

Garcia‐Segura, Sergi; Mostafa, Ehab; Baltruschat, Helmut

doi:10.1016/j.apcatb.2017.02.046

Cited by 77 publications

(30 citation statements)

References 40 publications

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“…Further oxidation and oxidative ring‐opening reactions of these aromatic compounds may have yielded simple carboxylic acids that were quantified as the above‐mentioned short‐chain organic acids. Finally, the carboxylic acids may have been converted into CO 2 , H 2 O and inorganic ions such as NO x species …”

Section: Resultsmentioning

confidence: 99%

“…Similarly, the stoichiometric H 2 O 2 dose led to 35% TN recovery in the form of NO 3 − and NO 2 − . The N mass balance also was incomplete, probably because of the release of N‐containing byproducts such as chloramines or gaseous nitrogen oxides (N x O y ) …”

Section: Resultsmentioning

confidence: 99%

“…The N mass balance also was incomplete, wileyonlinelibrary.com/jctb probably because of the release of N-containing byproducts such as chloramines 48 or gaseous nitrogen oxides (N x O y ). 47,49 Ecotoxicity and biodegradability Fenton-like oxidation was used here to increase the biodegradability of the effluent before its biological treatment. This required using biodegradability and toxicity tests to ensure biocompatibility of the Fenton effluents.…”

Section: Resultsmentioning

confidence: 99%

“…, H 2 O and inorganic ions such as NO x species 47. Concentrations of short-chain organic acids in the effluents from Fenton-like oxidation of the pure and commercial formulation of TMX.…”

mentioning

confidence: 99%

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Thiamethoxam removal by Fenton and biological oxidation

Gomez‐Herrero

Lebik-Elhadi

Aït-Amar

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND Thiamethoxam (TMX) is a potential insecticide pollutant of hydric resources that must be removed. Advanced oxidation processes (AOPs) are usually effective, but expensive to implement. Combining Fenton's reagent with biological oxidation circumvents the shortcomings of Fenton technology, facilitating the biodegradation of the resulting effluents in a sequencing batch reactor (SBR). RESULTS Fenton‐like oxidation of TMX with variable hydrogen peroxide (H2O2) doses afforded total organic carbon (TOC) conversion and chemical oxygen demand (COD) removal by (respectively) 40% and 80% from pure TMX, and 40% and 60% from commercial TMX. The effluents from Fenton oxidation using substoichiometric H2O2 doses were less ecotoxic and more biodegradable than the initial solution and, therefore, susceptible to a biological treatment. Biological oxidation of effluents obtained from 50% and 75% H2O2 doses was accomplished for different organic loads in 6‐h cycles. Coupling Fenton and biological oxidation of TMX afforded TOC conversion and COD removal of 80% for the effluent obtained with a 75% H2O2 dose. CONCLUSIONS Coupling Fenton–biological oxidation efficiently reduces the amounts of H2O2 needed and produces biodegradable effluents. In addition, the biological treatment increases COD and TOC removal by ≤80% for the overall treatment. © 2019 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…, H 2 O and inorganic ions such as NO x species 47. Concentrations of short-chain organic acids in the effluents from Fenton-like oxidation of the pure and commercial formulation of TMX.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Thiamethoxam removal by Fenton and biological oxidation

Gomez‐Herrero

Lebik-Elhadi

Aït-Amar

et al. 2019

J of Chemical Tech & Biotech

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“…As per nitrogen, mineralization of the organics yielded mainly NH 4 + , which accumulated in solution in concentrations up to 2.9 mmol L −1 after 6 h. The total concentration of NH 4 + and NO 3 − at the end of treatment (6 h) attained 45.75 % of the initial N concentration, which can be explained by the formation of other N‐derivatives, such as NO x species produced during . OH oxidation of the organics, and N 2 and NH 4 OH resulting from the electrochemical reduction of NO 3 − ,. The formation and destruction of short‐chain organic acids, as well as the release of inorganic ions in solution and the overall decrease of TOC, demonstrate the high mineralization efficiency of the near‐neutral EF‐TPP system.…”

Section: Resultsmentioning

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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Electrochemical Abatement of Analgesic Antipyretic 4‐Aminophenazone using Conductive Boron‐Doped Diamond and Sub‐Stoichiometric Titanium Oxide Anodes: Kinetics, Mineralization and Toxicity Assessment

et al. 2019

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The oxidation ability of two prominent eco-friendly electrochemical advanced oxidation processes (EAOPs), namely anodic oxidation with H 2 O 2 generation (AO-H 2 O 2 ) and electro-Fenton (EF) for complete abatement of acidic solution of 4-aminophenazone (4-APZ) has been investigated using conductive boron-doped diamond (BDD) and sub-stoichiometric titanium oxide (Ti 4 O 7 ) anodes and carbon-felt cathode. The higher performance of EF compared to AO-H 2 O 2 with either anode was demonstrated. In all trials, 4-APZ was completely destroyed, following pseudo first-order kinetics with the rate constant values increasing with applied current and higher values attained with BDD compared to Ti 4 O 7 anode at similar conditions. The absolute rate constant for the reaction between 4-APZ and hydroxyl radicals was found to be 3.9 � 0.2 × 10 9 L mol À 1 s À 1 . Complete mineralization could be attained with BDD anode, whereas Ti 4 O 7 anode only showed excellent mineralization up to 94 % TOC removal. Therefore, Ti 4 O 7 anode can constitutes a promising anode material thanks to its lower manufacturing cost. Inorganic ions like NO 3 À and HCO 3 À at concentration up to 25 mM has no effect on mineralization efficiency during AO-H 2 O 2 , but the presence of Cl À even at lower concentration of 10 mM significantly reduced the TOC removal efficiency. The toxicity of the solution sharply increased at initial stage of treatment, corresponding to the formation of cyclic by-products but their conversion to carboxylic acids due to longer treatment time involved a sharp toxicity decrease, thus ensuring overall detoxification. * OH)) are generated via water oxidation (Eq. (1)) at the surface of anodes (M). [22][23][24] Besides, when cathodes such carbon felt or gas diffusion cathodes are utilized, weak oxidant H 2 O 2 is generated in large quantities and the process is termed AO-H 2 O 2 . [25,26] [a] Dr.

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Could NOx be released during mineralization of pollutants containing nitrogen by hydroxyl radical? Ascertaining the release of N-volatile species

Cited by 77 publications

References 40 publications

Thiamethoxam removal by Fenton and biological oxidation

Thiamethoxam removal by Fenton and biological oxidation

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

Electrochemical Abatement of Analgesic Antipyretic 4‐Aminophenazone using Conductive Boron‐Doped Diamond and Sub‐Stoichiometric Titanium Oxide Anodes: Kinetics, Mineralization and Toxicity Assessment

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