Effect of electron acceptors H2O2 and O2 on the generated reactive oxygen species 1O2 and OH in TiO2-catalyzed photocatalytic oxidation of glycerol

Jedsukontorn, Trin; Meeyoo, Vissanu; Saito, Nagahiro; Hunsom, Mali

doi:10.1016/s1872-2067(16)62519-6

Cited by 39 publications

(25 citation statements)

References 43 publications

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“…The comparison between the power of O 2 and H 2 O 2 as electron acceptors was assessed and plotted in Figure 6. It is obvious that the effect of H 2 O 2 was three times stronger than that of O 2 , which is consistent with the findings of previous studies 49,50 …”

Section: Resultssupporting

confidence: 92%

Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange

Almazroai

Maliabari

2020

J Chinese Chemical Soc

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α-Fe 2 O 3 , as a promising photocatalyst in environmental aspects, was doped by a nonmetal to enhance the optical and electronic properties. Sulfur-doped hematite was synthesized by microwave irradiation. The samples were investigated by X-ray diffraction and energy dispersive X-ray-scanning electron microscopy. Nanostructure particles have a hexagonal structure that did not change after sulfur incorporation. The optical studies via UV-Visible spectroscopy proved the high absorbance of S/α-Fe 2 O 3 under the visible region. Moreover, the band gap of S/α-Fe 2 O 3 was shifted to higher wavelengths. However, nonmetals may exhibit a negative effect and act as recombination centers as the photoactivity of undoped hematite was still higher in the photodegradation of methyl orange as a pollutant. H 2 O 2 as an oxidant was fourfold better than O 2 , leading to the formation of the active oxygen species. The preparation method plays a crucial role in the shaping of nanostructure particles and its photoactivity.

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Section: Resultssupporting

confidence: 92%

Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange

Almazroai

Maliabari

2020

J Chinese Chemical Soc

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“…ESR effect of electron acceptors H 2 O 2 and O 2 on the generated reactive oxygen species 1 O 2 and OH in TiO 2 -catalyzed photocatalytic oxidation of glycerol. [79] Copyright 2016, Elsevier. prefers to generate * OH radicals from water, and the H 2 O from the reduction of O 2 in the PdOx/WO 3 system preferentially reacts with holes, suppressing the peroxidation of acetone.…”

Section: Reaction With * Ohmentioning

confidence: 99%

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

et al. 2020

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The photo-driven oxidation of organic molecules into corresponding high-value-added products has become a promising method in chemical synthesis. This strategy can drive thermodynamically non-spontaneous reactions and achieve challenging thermocatalytic processes under ambient conditions. Reactive oxygen species (ROS) are not only significant intermediates for producing target products via photoinduced oxidation reactions but also contribute to the creation of sustainable chemical processes. Here, the latest advances in heterogeneous photo-driven oxidation reactions involving ROS are summarized. The major types of ROS and their generation are introduced, and the behaviors of various ROS involved in photo-driven processes are reviewed in terms of the formation of different bonds. Emphasis is placed on unraveling the reaction mechanisms of ROS and establishing strategies for their regulation, and the remaining challenges and perspectives are summarized and analyzed. This Review is expected to provide an in-depth understanding of the mechanisms of ROS involved in photo-driven oxidation processes as an important foundation for the design of efficient catalysts. Clarifying the role of ROS in oxidation reactions has important scientific significance for improving the atomic and energy efficiency of reactions in practical applications.

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“…The reaction of photogenerated charge carriers with H 2 O 2 results in enhanced hydroxyl radical production and reduces surface recombination Equations (26) and (27) [23,62].…”

Section: H2o2/tio2 Under Visible Irradiationmentioning

confidence: 99%

“…Whilst mineralization increased as a function of TiO 2 loading, TOC removal at catalyst loadings of 1.61 and 1.98 mg TiO 2 /cm 2 was not enhanced, potentially due to the saturation of the active sites and also the limited visible light penetration through the thick films [63], as demonstrated in Figure 5. (26) and (27) [23,62] or with superoxide radical (O •− 2 ) reactions that can lead to the formation of OH • radical and singlet oxygen ( 1 O 2 ) Equations (30)-(33) [62].…”

Section: H2o2/tio2 Under Visible Irradiationmentioning

confidence: 99%

Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

Alrousan

Afkhami

Bani‐Melhem

et al. 2020

Water

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In keeping with the circular economy approach, reclaiming greywater (GW) is considered a sustainable approach to local reuse of wastewater and a viable option to reduce household demand for freshwater. This study investigated the mineralization of total organic carbon (TOC) in GW using TiO2-based advanced oxidation processes (AOPs) in a custom-built stirred tank reactor. The combinations of H2O2, O3, and immobilized TiO2 under either dark or UVA irradiation conditions were systematically evaluated—namely TiO2/dark, O3/dark (ozonation), H2O2/dark (peroxidation), TiO2/UVA (photocatalysis), O3/UVA (Ozone photolysis), H2O2/UVA (photo-peroxidation), O3/TiO2/dark (catalytic ozonation), O3/TiO2/UVA (photocatalytic ozonation), H2O2/TiO2/dark, H2O2/TiO2/UVA, H2O2/O3/dark (peroxonation), H2O2/O3/UVA (photo-peroxonation), H2O2/O3/TiO2/dark (catalytic peroxonation), and H2O2/O3/TiO2/UVA (photocatalytic peroxonation). It was found that combining different treatment methods with UVA irradiation dramatically enhanced the organic mineralization efficiency. The optimum TiO2 loading in this study was observed to be 0.96 mg/cm2 with the highest TOC removal (54%) achieved using photocatalytic peroxonation under optimal conditions (0.96 mg TiO2/cm2, 25 mg O3/min, and 0.7 H2O2/O3 molar ratio). In peroxonation and photo-peroxonation, the optimal H2O2/O3 molar ratio was identified to be a critical efficiency parameter maximizing the production of reactive radical species. Increasing ozone flow rate or H2O2 dosage was observed to cause an efficiency inhibition effect. This lab-based study demonstrates the potential for combined TiO2-AOP treatments to significantly reduce the organic fraction of real GW, offering potential for the development of low-cost systems permitting safe GW reuse.

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Effect of electron acceptors H2O2 and O2 on the generated reactive oxygen species 1O2 and OH in TiO2-catalyzed photocatalytic oxidation of glycerol

Cited by 39 publications

References 43 publications

Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange

Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

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Effect of electron acceptors H2O2 and O2 on the generated reactive oxygen species 1O2 and OH in TiO2-catalyzed photocatalytic oxidation of glycerol

Cited by 39 publications

References 43 publications

Microwave synthesis of sulfur‐doped α‐Fe2O3 and testing in photodegradation of methyl orange

Microwave synthesis of sulfur‐doped α‐Fe2O3 and testing in photodegradation of methyl orange

Recent Advances in Heterogeneous Photo‐Driven Oxidation of Organic Molecules by Reactive Oxygen Species

Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes

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Product

Resources

About

Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange

Microwave synthesis of sulfur‐doped α‐Fe₂O₃ and testing in photodegradation of methyl orange