Oxygen vacancy of CeO2 improved efficiency of H2O2/O3 for the degradation of acetic acid in acidic solutions

Ding, Yalei; Wang, Jiejie; Xu, Shanshan; Lin, Kun‐Yi Andrew; Tong, Shaoping

doi:10.1016/j.seppur.2018.06.027

Cited by 44 publications

(6 citation statements)

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“…“ Characterization of Catalysts ”, the CeO 2 particles in the bifunctional nanocomposite have a significantly smaller size than those in the sole CeO 2 . According to the literature 8 , concentration of defect sites in CeO 2 increases with decreasing particle size. Thus, the smaller size of the ceria particles in the nanocomposite catalyst may result not only in a greater interface between CeO 2 and CePO 4 , which facilitates redox switching between Ce 3+ ↔ Ce 4+ sites from the CePO 4 and CeO 2 lattice, but also in higher concentration of Ce 3+ sites which play an important role in activation of ozone towards formation of hydroxyl radicals via reactions ( 1 ) and ( 2 ).…”

Section: Resultsmentioning

confidence: 89%

“…Until now, many authors have reported that the efficiency of ozonation processes can be enhanced in the presence of heterogeneous catalysts 5 – 8 . More efficient degradation of organic pollutants through catalytic ozonation is possible because of the unique ability of a selected nanomaterial (e.g.…”

Section: Introductionmentioning

confidence: 99%

“… 1 , 9 – 11 . Concerning ozonation processes in the presence of CeO 2 as catalyst, it was found that reactivity of this metal oxide is strongly affected by the size of the ceria particles and concentration of lattice defects (i.e., Ce 3 + ions and oxygen vacancies) 8 . According to recent studies by Wang et al 12 , Ce 3+ ions are one of the key species responsible for the catalytic activation of ozone on CeO 2 towards formation of hydroxyl radicals via reactions ( 1 – 2 ).…”

Section: Introductionmentioning

confidence: 99%

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Bifunctional CePO4/CeO2 nanocomposite as a promising heterogeneous catalyst for the enhancement of the ozonation recovery effect in the presence of chloride ions

Fijołek

Wolski

2022

Sci Rep

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The degradation of organics through ozonation is strongly reduced by chloride ions. Although the efficiency of such processes can be recovered in the presence of homogeneous phosphates, the addition of these chemicals to water is problematic because of the generation of secondary wastes. Phosphates are known as one of the most important biogens responsible for the eutrophication of rivers and lakes. Thus, their worldwide application should be limited. The main goal of this work was to characterize the performance of solid-state cerium(III) phosphate (CePO4), cerium dioxide (CeO2), and bifunctional CePO4/CeO2 nanocomposite as substitutes for homogeneous phosphates during the ozonation of benzoic acid (BA) in the presence of chlorides. All solid-state samples used in this study were synthesized by facile hydrothermal method and thoroughly characterized. It was documented that heterogeneous CePO4 showed significantly better ozonation recovery effect than homogeneous phosphates. It was also established that the process efficiency could be further enhanced by using the bifunctional nanocomposite. Tests with the use of tert-butanol as a hydroxyl radical scavenger revealed that the improved ozonation efficiency in the presence of CePO4/CeO2 resulted from the action of HO• radicals which were the key reactive oxygen species responsible for the recovery of BA degradation in the presence of chlorides.

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Section: Resultsmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Bifunctional CePO4/CeO2 nanocomposite as a promising heterogeneous catalyst for the enhancement of the ozonation recovery effect in the presence of chloride ions

Fijołek

Wolski

2022

Sci Rep

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“…Peroxone technique is a blend of hydrogen peroxides (H 2 O 2 ) and ozone (O 3 ), and on this account several free radicals are produced, which oxidize waste organic compound present in water, but requirement of hydrogen peroxide enhances its cost as well as its storage and transport problem [8]. Furthermore, peroxone has shortcomings of low oxygen ozone conversion rate and been suppressed under neutral and acidic environments [9]. Likewise, ozonation is highly resourceful practice for treatment of large biorecalcitrant-based wastewater; such type of waste usually required high quantity of energy to decay and has the ability to resist microbes; being an oxidizing agent, a large number of intermediates are generated by ozone, which initiated chain reaction and hence degraded waste.…”

Section: Introductionmentioning

confidence: 99%

Electro-Peroxone and Photoelectro-Peroxone Hybrid Approaches: An Emerging Paradigm for Wastewater Treatment

Fatima¹,

Fazal²,

Shaheen³

2022

Wastewater Treatment

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Electrochemical advanced oxidation practices (EAOPs), remarkably, electro-peroxone (EP), photoelectro-peroxone (PEP), and complementary hybrid EP approaches, are emerging technologies on accountability of complete disintegration and elimination of wide spectrum of model pollutants predominantly biodegradable, recalcitrant, and persistent organic pollutants by engendering powerful oxidants in wastewater. A concise mechanism of EP and PEP approaches along with their contribution to free radical formation are scrutinized. Furthermore, this chapter provides a brief review of EP, PEP, and complementary hybrid EP-based EAOPs that have pragmatically treated laboratory-scale low- and high-concentrated distillery biodigester effluent, refractory pharmaceutical, textile, herbicides, micropollutant, organic pollutant, acidic solution, landfill leachates, municipal secondary effluents, hospital, and industries-based wastewater. Afterward, discussion has further extended to quantitatively evaluate energy expenditures in terms of either specific or electrical energy consumptions for EP and PEP practices through their corresponding equations.

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“…It was deduced that the increased degradation ability was due to the formation of more reactive hydroxyl radicals (•OH) with higher redox potentials with the help of specific catalysts, which can then be used to further degrade the target pollutants (Chen et al 2016;Sui et al 2010). It has been found that nano-CeO2 greatly improved the oxidation efficiency of the H2O2/O3 system and promoted the degradation of acetic acid small molecules (Ding et al 2018). Peng et al showed that the O3 oxidation efficiency of succinic acid reached 100% in combination with a Ni/Al2O3 catalyst (Peng et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Complete mineralization of acetic acid using catalytic ozonation with a high energy efficiency enhanced by MnO2/γ-Al2O3

Meng

Yao

Gao

et al. 2021

Preprint

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The complete mineralization of acetic acid in a biodegradation process is difficult due to the α-position methyl on the carboxyl group of acetic acid. This study explores the complete oxidation of acetic acid by catalytic ozonation. Metal oxides of MnO2, Co3O4, Fe3O4, and CeO2 loaded on γ-Al2O3 power were used as the catalysts. The experimental results showed that MnO2/γ-Al2O3 catalyst had the best mineralization performance for acetic acid. Typically, the mineralization of acetic acid is as high as 88.4% after 300 min ozonation of 100 mL of 1.0 g L‒1 acetic acid catalysed by 3.0 g 1.0wt.% MnO2/γ-Al2O3 catalyst powder with an energy efficiency of 15 g kWh‒1. However, without a catalyst, the mineralization of acetic acid is only 33.2% with an energy efficiency of 5.1 g kWh−1. The effects of MnO2 loading, catalyst dosage, acetic acid concentration, O3 concentration, ozonation temperature, and initial pH value of the acetic acid solution were systematically investigated. Radical quenchers and in-situ DRIFTS analyses indicated that •OH radical and reactive oxygen species on catalyst surface played an important role in the ozonation of acetic acid to CO2 and H2O. The mechanism of acetic acid oxidation on MnO2/γ-Al2O3 is proposed.

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Oxygen vacancy of CeO2 improved efficiency of H2O2/O3 for the degradation of acetic acid in acidic solutions

Cited by 44 publications

References 44 publications

Bifunctional CePO4/CeO2 nanocomposite as a promising heterogeneous catalyst for the enhancement of the ozonation recovery effect in the presence of chloride ions

Bifunctional CePO4/CeO2 nanocomposite as a promising heterogeneous catalyst for the enhancement of the ozonation recovery effect in the presence of chloride ions

Electro-Peroxone and Photoelectro-Peroxone Hybrid Approaches: An Emerging Paradigm for Wastewater Treatment

Complete mineralization of acetic acid using catalytic ozonation with a high energy efficiency enhanced by MnO2/γ-Al2O3

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