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Shafikov, N. Ya.; Gusmanov, A. A.; Zimin, Yu. S.; Комиссаров, В. Д.

doi:10.1023/a:1021638704538

Cited by 9 publications

(4 citation statements)

References 7 publications

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“…Contributions of the generated radicals to the degradation of organics can be investigated by the addition of radical scavengers in the HCO systems. tBA has been intensively employed as a • OH scavenger due to its sluggish reaction rate with O 3 (3 × 10 –3 M –1 s –1 ) and fast reaction rate with • OH (6 × 10 8 M –1 s –1 ). − However, tBA is only effective for quenching • OH in the bulk solution, yet incapable of scavenging the surface-adsorbed • OH . Sui et al discovered that although the presence of tBA did not inhibit the catalytic activity of nitrobenzene in MnO x /MCM-41 HCO, EPR spectra revealed that the intensity of the DMPO- • OH signal was significantly greater than that in ozonation .…”

Section: Radicals Identification and Their Contributions In Radical-b...mentioning

confidence: 99%

Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification

Wang

Cao

et al. 2020

Environ. Sci. Technol.

330

127

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Heterogeneous catalytic ozonation (HCO) processes have been widely studied for water purification. The reaction mechanisms of these processes are very complicated because of the simultaneous involvement of gas, solid, and liquid phases. Although typical reaction mechanisms have been established for HCO, some of them are only appropriate for specific systems. The divergence and deficiency in mechanisms hinders the development of novel active catalysts. This critical review compares the various existing mechanisms and categorizes the catalytic oxidation of HCO into radical-based oxidation and nonradical oxidation processes with an in-depth discussion. The catalytic active sites and adsorption behaviors of O 3 molecules on the catalyst surface are regarded as the key clues for further elucidating the O 3 activation processes, evolution of reactive oxygen species (ROS) or organic oxidation pathways. Moreover, the detection methods of the ROS produced in both types of oxidations and their roles in the destruction of organics are reviewed with discussion of some specific problems among them, including the scavengers selection, experiment results analysis as well as some questionable conclusions. Finally, alternative strategies for the systematic investigation of the HCO mechanism and the prospects for future studies are envisaged.

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Section: Radicals Identification and Their Contributions In Radical-b...mentioning

confidence: 99%

Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification

Wang

Cao

et al. 2020

Environ. Sci. Technol.

330

127

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“…[33,34] Direct ionic oxidation of tertiaryalcohol tBuOH by ozone can also be ruled out. [35] The gas was dispersed through a2mm inner diameter (i.d.) tube instead of af rit because small amounts of tBuOH already induced foam formation thatm ade the reaction difficult to handle.…”

Section: Mechanistic Studiesmentioning

confidence: 99%

Regeneration of Aqueous Periodate Solutions by Ozone Treatment: A Sustainable Approach for Dialdehyde Cellulose Production

et al. 2016

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A method for easy and fast regeneration of aqueous periodate solutions from dialdehyde cellulose (DAC) production by ozone treatment is presented, along with a direct and reliable simultaneous quantification of iodate and periodate by reversed-phase HPLC. The influence of iodate and ozone concentration, solution pH, and reaction time on the regeneration efficiency was studied, as well as the reaction kinetics. Regeneration of spent periodate solutions by ozone was successfully performed in alkaline medium, which favors the formation of free (.) OH radicals, as supported by the addition of radical scavengers and quantum mechanical calculations. At pH 13 and an ozone concentration of approximately 150 mg L(-1) , periodate was completely regenerated from a 100 mm solution of iodate within 1 h at room temperature. A cyclic process of cellulose oxidation and subsequent regeneration of spent periodate with 90 % efficiency has been developed. So far, commercial applications of DAC have been hampered by difficulties in reusing the costly periodate. This work overcomes this hurdle and presents a highly efficient, clean, and low-cost protocol for the preparation of DAC with integrated periodate recycling, with the possibility of scaling the process up.

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“…A number of authors have tried to elucidate the kinetics and mechanism of the ozonolysis of alcohols and their application to the selective preparation of ketones and aldehydes in high yields under mild conditions [3,[39][40][41][42][43][44][45][46]. The basic concepts of such reactions are discussed in several references [1,2,25,34,35,39].…”

Section: Alcoholsmentioning

confidence: 99%

Kinetics and Mechanism of the Ozone Reaction with Alcohols, Ketones, Ethers and Hydroxybenzenes

Rakovsky¹,

Anachkov²,

Belitskii³

et al. 2016

ChChT

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Abstract. The review, based on 92 references, is focused on degradation of organics by ozonation and it comprises various classes of oxygen-containing organic compounds -alcohols, ketones, ethers and hydroxybenzenes. The mechanisms of a multitude of ozone reactions with these compounds in organic solvents are discussed in details, presenting the respective reaction schemes. The corresponding kinetic parameters are given and some thermodynamic parameters are also listed. The dependences of the kinetics and the mechanism of the ozonation reactions on the structure of the compounds, on the medium and on the reaction conditions are revealed. Various possible applications of ozonolysis are specified and discussed. All these reactions have practical importance for the protection of the environment.

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Untitled

Cited by 9 publications

References 7 publications

Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification

Reactive Oxygen Species and Catalytic Active Sites in Heterogeneous Catalytic Ozonation for Water Purification

Regeneration of Aqueous Periodate Solutions by Ozone Treatment: A Sustainable Approach for Dialdehyde Cellulose Production

Kinetics and Mechanism of the Ozone Reaction with Alcohols, Ketones, Ethers and Hydroxybenzenes

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