Development of a free radical-based kinetics model for the oxidative degradation of chlorazol black in aqueous solution using periodate photoactivated process

Djaballah, Mohamed Larbi; Merouani, Slimane; Bendjama, Hafida; Hamdaoui, Oualid

doi:10.1016/j.jphotochem.2020.113102

Cited by 22 publications

(7 citation statements)

References 58 publications

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“…The identification of reactive species is of great importance to understand the underlying mechanism of the Fe(II)/KIO 4 process. The possible reactive species include • OH, singlet oxygen ( 1 O 2 ), superoxide anion radical ( • O 2 − ), iodate radical ( • IO 3 ), and Fe(IV) [ 12 , 17 ]. It has been reported that ascorbic acid (AA) has the ability of non-selective scavenging free radicals, which can be used to preliminarily test whether radical species were generated in the reaction system [ 52 ].…”

Section: Resultsmentioning

confidence: 99%

“…Sulfate radical (SO 4 •− )-based AOPs seem to perform better due to SO 4 •− having a higher redox potential (2.5–3.1 V) than • OH (1.8–2.7 V) [ 10 , 11 ]. More recently, periodate-based AOPs have attracted increasing attentions for the degradation of aqueous contaminants [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. Notably, Zong et al [ 17 ] reported that KIO 4 is readily activated by Fe(II) under acidic conditions, resulting in the enhanced abatement of organic contaminants, with the decay ratios of the selected pollutants even exceeding those in the Fe(II)/peroxymonosulfate (PMS) and Fe(II)/peroxydisulfate (PDS) processes under identical conditions.…”

Section: Introductionmentioning

confidence: 99%

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Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation

Xiao

Liu

Wang

et al. 2022

IJERPH

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Fe(II)-activated potassium periodate (KIO4) oxidation was used to improve the dewaterability of waste-activated sludge for the first time. Compared with those of raw sludge, the capillary suction time (CST), specific resistance filtration (SRF), and water content of filter cake (WC) of sludge treated using the Fe(II)/KIO4 process under the optimal conditions (i.e., the initial pH = 6.8, KIO4 dose = 1.4 mmol/g volatile suspended solids, Fe(II)/KIO4 molar ratio = 1.2) decreased by 64.34%, 84.13%, and 6.69%, respectively. For conditioned sludge flocs, the Zeta potential and particle size were increased, and hydrophilic proteins in extracellular polymeric substances (EPS) were partly degraded, accompanied by the transformation of tightly bound EPS into soluble EPS and the conversion of dense sludge flocs into loose and porous ones. During Fe(II)/KIO4 oxidation, Fe(IV) and the accompanying •OH were determined as the predominant reactive species and the underlying mechanism of sludge EPS degradation was proposed. This work provides a prospective method for conditioning the sludge dewaterability.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation

Xiao

Liu

Wang

et al. 2022

IJERPH

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“…In gamma radiolysis, typical dose rates are 10 −3 -10 −2 Gy s −1 [62] and for low LET radiation, the OH • G-value is 2.8 at room temperature, equivalent to a production rate of 0.001-0.030 µM s −1 , while with x-ray radiolysis, production levels of 0.3 µM s −1 have been reported [63]. In AOPs with UV excitation, direct measurements of rates [64,65] or of OH • concentrations [66,67] indicate rates up to ∼0.01 µM s −1 whereas with VUV excitation of the gas phase, 70 µM s −1 has been demonstrated [68]. OH • generation via the traditional Fenton, or Fentonlike reactions, can be enhanced using an external electric field [69] and/or heterogeneous catalysts to deliver rates in the range 0.1-1.0 µM s −1 [70,71], while the addition of high concentrations of H 2 O 2 further increases the rate to 1-10 µM s −1 [72,73].…”

Section: Discussionmentioning

confidence: 99%

Generation and delivery of free hydroxyl radicals using a remote plasma

McQuaid

Rutherford

Mariotti

et al. 2023

Plasma Sources Sci. Technol.

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We demonstrate a new gas-based OH• generation source using a low power RF-driven atmospheric pressure plasma configured to deliver the radical flux into the far effluent region, well away from interference from other plasma factors such as electric fields, currents, and UV radiation. Using He – H2O gas chemistry isolated from the laboratory air, the plasma generated flux contains OH• and other radicals including H•, O and HO2 as well as H2O2 which, along with OH•, was found to vary with H2O vapour content and absorbed power density. Peak flux values were 2.3 nmol s-1 and 0.23 nmol s-1 for H2O2 and OH• respectively at a distance of 50 mm from the plasma, with 790 ppmv H2O and a power density of ~ 108 W m-3. The maximum OH• flux density was 4.5 x 1019 m-2 s-1 falling to 1.7 x 1019 m-2 s-1 at 110 mm, equivalent to generation rates of 74 mM s-1 and 28 mM s-1. Despite high OH• recombination rates at the plasma exit, the escaping flux is still significant, indicating a viable delivery capability to downstream targets. Its performance with regard to OH• generation rates compares well with traditional OH• generation techniques such as radiolysis, advanced oxidation processes and enhanced Fenton-chemistry approaches where OH• production rates are sub-mM s-1. Delivering precisely quantifiable OH• fluxes provides new opportunities for scientific studies and technological opportunities in cell biology, atmospheric chemistry, protein unfolding and systematic dose studies for plasma-based and other OH• related potential medical treatments.

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“…The degradation rate constant was 0.1015 min -1 . The experimental conditions were as follows: the initial concentration of 4chlorophenol -10 -4 mol/dm 3 ; the initial concentration of periodate -10 -3 mol/dm 3 ; the α-Fe 2 O 3 content in the reaction medium -0.4 g/dm 3 .…”

Section: Activation By Transition Metals and Their Compoundsmentioning

confidence: 99%

“…In this case, the degradation rate constant of sulfisoxazole was 0.196 min -1 . The conditions of the study were as follows: pH of the reaction medium 3.0; temperature 25 °C; initial concentration of periodate 0.5× 10 -3 mol/dm 3 ; catalyst content (Fe@N-C) in the reaction medium 0.05 g/dm 3 . Based on the results of scavenging experiments, it was concluded that the reaction mechanism for the Fe@N-C/PI system involved electron transfer.…”

Section: Activation By Carbon-based Materialsmentioning

confidence: 99%

Activated Periodates and Sodium Percarbonate in Advanced Oxidation Processes of Organic Pollutants in Aqueous Media: A Review

Sukhatskiy,

Znak,

Sozanskyi

et al. 2024

ChChT

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The methods of periodates and sodium percarbonate activation are considered for planning strategic approaches to increasing the efficiency and intensity of oxidative degradation of organic pollutants in aquatic environments. A classification of periodate activation methods is proposed, including activation methods by external energy effects, catalytic activation methods, and other activation methods (e.g., by hydrogen peroxide, by hydroxylamine, activation in alkaline medium). Activation methods for sodium percarbonate were divided into homogeneous and heterogeneous activation methods.

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Development of a free radical-based kinetics model for the oxidative degradation of chlorazol black in aqueous solution using periodate photoactivated process

Cited by 22 publications

References 58 publications

Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation

Improved Dewaterability of Waste Activated Sludge by Fe(II)-Activated Potassium Periodate Oxidation

Generation and delivery of free hydroxyl radicals using a remote plasma

Activated Periodates and Sodium Percarbonate in Advanced Oxidation Processes of Organic Pollutants in Aqueous Media: A Review

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