Effects of pH value and temperature on the initiation, promotion, inhibition and direct reaction rate constants of natural organic matter in ozonation

Yong, Ee Ling; Lin, Yi

doi:10.1039/c5ra19359a

Cited by 17 publications

(4 citation statements)

References 61 publications

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“…The promoter reacts with • OH to produce O 2 •– , which further simulates • OH production by reacting with O 3 . In the case of SMP ozonation, the direct reaction rate ( k direct = 26.62 × 10 –3 L (mol s) −1 ) is 2 orders of magnitude higher than the chain initiation reaction rate ( k initiation = 0.25 × 10 –3 L (mol s) −1 ); for details, see SI-Text S3. , Obviously, insufficient amounts of initiator at a high O 3 dose limit the chain propagation reaction, reducing the yield of the entire chain reaction. Most of the O 3 is consumed through the direct reaction, leading to a decrease in yield.…”

Section: Resultsmentioning

confidence: 99%

Importance of Chain Length in Propagation Reaction on ^•OH Formation during Ozonation of Wastewater Effluent

Zou

Liu

Han

et al. 2023

Environ. Sci. Technol.

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During the ozonation of wastewater, hydroxyl radicals (•OH) induced by the reactions of ozone (O3) with effluent organic matters (EfOMs) play an essential role in degrading ozone-refractory micropollutants. The •OH yield provides the absolute •OH formation during ozonation. However, the conventional “tert-Butanol (t-BuOH) assay” cannot accurately determine the •OH yield since the propagation reactions are inhibited, and there have been few studies on •OH production induced by EfOM fractions during ozonation. Alternatively, a “competitive method”, which added trace amounts of the •OH probe compound to compete with the water matrix and took initiation reactions and propagation reactions into account, was used to determine the actual •OH yields (Φ) compared with that obtained by the “t-BuOH assay” (φ). The Φ were significantly higher than φ, indicating that the propagation reactions played important roles in •OH formation. The chain propagation reactions facilitation of EfOMs and fractions can be expressed by the chain length ( n ). The study found significant differences in Φ for EfOMs and fractions, precisely because they have different n . The actual •OH yield can be calculated by n and φ as Φ = φ (1 + n)/( nφ + 1), which can be used to accurately predict the removal of micropollutants during ozonation of wastewater.

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Section: Resultsmentioning

confidence: 99%

Importance of Chain Length in Propagation Reaction on ^•OH Formation during Ozonation of Wastewater Effluent

Zou

Liu

Han

et al. 2023

Environ. Sci. Technol.

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“…Most studies reported satisfactory results at room temperature (O 3 solubility in water of 1.19 × 10 −2 mol/L at 20 °C) [ 23 , 59 ]. In general, ozone rate constants depend on temperature, but only few studies report values in detail, showing activation energies for reactions with ozone in the range of 35–50 kJ/mol [ 23 , 99 , 100 , 101 ].…”

Section: Catalytic Ozonationmentioning

confidence: 99%

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

Inchaurrondo

Font

2022

Molecules

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Ozone has been successfully employed in water treatment due to its ability to oxidize a wide variety of refractory compounds. In order to increase the process efficiency and optimize its economy, the implementation of heterogeneous catalysts has been encouraged. In this context, the use of cheap and widely available natural materials is a promising option that would promote the utilization of ozone in a cost-effective water treatment process. This review describes the use of natural clays, zeolites and oxides as supports or active catalysts in the ozonation process, with emphasis on the structural characteristics and modifications performed in the raw natural materials; the catalytic oxidation mechanism; effect of the operating parameters and degradation efficiency outcomes. According to the information compiled, more research in realistic scenarios is needed (i.e., real wastewater matrix or continuous operation in pilot scale) in order to transfer this technology to the treatment of real wastewater streams.

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“…They found that with the increase of pH and time, color shifted from light yellow to yellow after 12 hours. pH can also affect the initiation, promotion, inhibition and direct reaction rate constant of any treatment processes [208,209]. Microscopic results showed that acidic medium can produce the smooth and regular structure.…”

Section: Effect Of Phmentioning

confidence: 99%

A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment

Kumar

Mohapatra

Dharmadhikari

et al. 2019

Bull. Chem. React. Eng. Catal.

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This comprehensive review focuses on the different factors, modification in the synthesis method, characterization and application of heterogeneous catalyst in the wastewater treatment based on the Fenton process. The present review highlights the different catalyst preparation methods like wet impregnation method, hydrothermal method, sol-gel method, precipitation method and their application to treat different recalcitrant organic chemicals. Major heterogeneous catalyst synthesis methods were discussed with their excellent workability. The importance of modification through physical and chemical method was also reported. Different catalyst, pollutants and optimum parametric conditions available in the literature along with some relevant studies are summarized. The effect of factors like pH, calcination and some other modifiers on the synthesis and their efficiency in the wastewater treatment has been described. The important characterization of synthesized catalysts explaining their working efficiency has also been discussed. In the final section, the application of heterogeneous catalyst synthesized by different methods in the wastewater/effluent treatment has been investigated. The main aim of this review is to find out the influence of process parameters and catalytic method on degradation/decolorization of organic compounds present in industrial or synthetic wastewater. Copyright © 2020 BCREC Group. All rights reserved

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Effects of pH value and temperature on the initiation, promotion, inhibition and direct reaction rate constants of natural organic matter in ozonation

Abstract: pH and temperature affect the kinetics of specific reactions of NOM and influence organic contaminants removal in the ozonation process.

Cited by 17 publications

References 61 publications

Importance of Chain Length in Propagation Reaction on ^•OH Formation during Ozonation of Wastewater Effluent

Importance of Chain Length in Propagation Reaction on ^•OH Formation during Ozonation of Wastewater Effluent

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment

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Effects of pH value and temperature on the initiation, promotion, inhibition and direct reaction rate constants of natural organic matter in ozonation

Abstract: pH and temperature affect the kinetics of specific reactions of NOM and influence organic contaminants removal in the ozonation process.

Cited by 17 publications

References 61 publications

Importance of Chain Length in Propagation Reaction on •OH Formation during Ozonation of Wastewater Effluent

Importance of Chain Length in Propagation Reaction on •OH Formation during Ozonation of Wastewater Effluent

Clay, Zeolite and Oxide Minerals: Natural Catalytic Materials for the Ozonation of Organic Pollutants

A Review Paper on Heterogeneous Fenton Catalyst: Types of Preparation, Modification Techniques, Factors Affecting the Synthesis, Characterization, and Application in the Wastewater Treatment

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Importance of Chain Length in Propagation Reaction on ^•OH Formation during Ozonation of Wastewater Effluent

Importance of Chain Length in Propagation Reaction on ^•OH Formation during Ozonation of Wastewater Effluent