Sonocatalytic degradation of oxalic acid in the presence of oxygen and Pt/TiO2

Chave, Tony; Navarro, Nathalie M.; Pochon, Patrick; Perkas, Nina; Gedanken, Aharon; Nikitenko, Sergey I.

doi:10.1016/j.cattod.2014.07.040

Cited by 26 publications

(19 citation statements)

References 47 publications

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“…The HRTEM micrographs acquired for the Pt/TiO 2 catalyst are shown in Fig. 4 and reveal well dispersed 1-3 nm Pt nanoparticles on the TiO 2 support as it was already reported in the literature [16]. Fig.…”

Section: Physico-chemical Characterization Of the Co 3 O 4 /Tio 2 Andsupporting

confidence: 71%

“…The electric load power was regulated at 73 W and the corresponding absorbed acoustic power was evaluated by thermal probe method at 0.20 W•mL −1 . The volume of sonicated solution was 200 mL, while additional mechanical stirring at 250 rpm was used in order to warranty a homogeneous suspension of catalyst particles [16]. The temperature during sonolysis was controlled between 20 and 50°C with a Huber Unistat Tango thermo-cryostat and measured by a thermocouple immersed into ultrasound-irradiated solution.…”

Section: Edta Degradation Experimentsmentioning

confidence: 99%

“…It has been recently shown that power ultrasound accelerates the catalytic oxidation of carboxylic acids in the presence of powdered Pt/ TiO 2 and Ar/O 2 gas mixtures [16]. The sonocatalytic effect was attributed to the strong dispersion of the Pt/TiO 2 catalyst together with the generation of chemically active species during water sonolysis.…”

mentioning

confidence: 99%

“…Moreover, we found that Co 3 O 4 /TiO 2 exhibits much higher sonocatalytic activity than Pt/TiO 2 in studied reaction. Ultrasonic frequency and gas composition were chosen on the basis of previous researches [12,16].…”

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confidence: 99%

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Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Parizot

Chave

Gálvez

et al. 2019

Applied Catalysis B: Environmental

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The sonocatalytic degradation of EDTA in aqueous solution was studied under ultrasound irradiation (345 kHz, 73 W, acoustic power 0.20 W•mL −1 , Ar and Ar/O 2 saturating gases, T = 20-50°C) in the presence of Co 3 O 4 /TiO 2 and Pt/TiO 2 nanocatalysts. About 90% of EDTA (C 0 = 5 10-3 M) was oxidized during ultrasonic treatment at 40°C in the presence of the Co 3 O 4 /TiO 2 catalyst and Ar/O 2 gas mixture. By contrast, Pt/TiO 2 catalyst exhibited much lower sonocatalytic activity in this system. Suggested mechanism of EDTA oxidation in the presence of Co 3 O 4 /TiO 2 catalyst involved the generation of oxidizing radicals by acoustic cavitation and Co(II)-Co(III) redox process. Quite low apparent activation energy of the sonocatalytic process (E a = 19 kJ mol −1) was attributed to diffusion of reagents in the vicinity of the active sites of catalyst. Sonocatalytic degradation of EDTA is accompanied by formation of iminodiacetic acid, formic acid, oxalic acid, glycolic acid and acetic acid as intermediate products in an agreement with radical-driven mechanism.

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Section: Physico-chemical Characterization Of the Co 3 O 4 /Tio 2 Andsupporting

confidence: 71%

Section: Edta Degradation Experimentsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Parizot

Chave

Gálvez

et al. 2019

Applied Catalysis B: Environmental

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“…They are based on the intensive generation of reactive radicals, such as hydroxyls, able to oxidize the organic pollutants contained in wastewaters. Ultrasounds are frequently used in the intensification of chemical processes, among them the oxidation of organic pollutants in wastewaters in which ultrasonic sonochemistry plays an important role for several decades [3][4][5][6][7][8][9][10]. Typically induced by piezoelectric transducers [11], ultrasonic sonochemistry is based in the phenomena of cavitation, i.e.…”

Section: Introductionmentioning

confidence: 99%

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

Dutilleul

Partaloglu

Costa

et al. 2017

Chemical Engineering and Processing: Process Intensification

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Graphical Abstract2 Highlights  Cavitation induced by the impact of a solid piston on liquid surface  Shock-waves of several bars amplitude exciting a wide frequency range  Phenol degradation initiated at ambient temperature and absence of oxidants  High phenol mineralization extents measured upon H2O2 addition  Accelerated active radical formation in the presence of shock-induced cavitation AbstractShock-induced cavitation phenomena, resulting from the propagation of the trail of shockwaves generated upon the impact of a solid piston on a liquid surface, was used as an innovative way of intensifying the oxidation of phenol in aqueous media. The amount of energy communicated by the impact was found to be proportional to the impact height, and was directly related to the maximal pressure attained, i.e. in the order of several tens of bars. This peak was followed by a rarefaction period that results in the origination of several cavitation phenomena, which continued upon piston rebound and further shock-wave generation and propagation. The multi-frequency nature of shock-induced cavitation, capable of exciting a wide range of frequencies between 1 kHz and 100 kHz, was confirmed by means of wavelet analysis. Under shock-induced cavitation conditions, phenol degradation was found to be possible even in the absence of any oxidizing agent. High extents of mineralization, i.e. 45.3 and 56.2% TOC elimination, 50 mg/L solution, neutral pH, were obtained in the presence of H2O2 (aprox. 10% vol.), pointing to an acceleration of the oxidation reaction based in a faster and more efficient creation of radical species.

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CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

et al. 2021

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A new nanohybrid photocatalyst named cerium (IV) oxide (CeO 2 )/TiO 2 (titania)/silicon dioxide (SiO 2 ) was firstly synthesized employing the coprecipitation technique to elaborate the degradation efficiency of chlorpyrifos (CPS) as a relatively indelible organophosphorus pesticide in deionized water in photocatalytic and sonophotocatalytic processes. The influence of various parameters, including photocatalyst dosage, the CPS pesticide concentration, pH, and irradiation time, was investigated, and the optimal parameters for photodegradation and sonophotodegradation were determined. The activity and the electrical energy of this photocatalyst in the photodegradation and sonophotodegradation processes were compared, and it was revealed that the sonophotocatalytic process was superior to the photocatalytic one (about 15%).Results depicted that it can be employed four times for the photocatalytic reactions with the same yield of CPS degradation. Besides, the CPS degradation efficiency at the optimum conditions was found to be 81.1% and 90.8% for the photo-degradation and sonophotodegradation, respectively. Pursuant to the kinetic studies, the kinetics models that govern these processes are leaner with acceptable accuracy.

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Sonocatalytic degradation of oxalic acid in the presence of oxygen and Pt/TiO2

Cited by 26 publications

References 47 publications

Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

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Sonocatalytic degradation of oxalic acid in the presence of oxygen and Pt/TiO2

Cited by 26 publications

References 47 publications

Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Sonocatalytic oxidation of EDTA in aqueous solutions over noble metal-free Co3O4/TiO2 catalyst

Shock-induced cavitation as a way of accelerating phenol oxidation in aqueous media

CeO2/TiO2/SiO2 nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos

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Product

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CeO₂/TiO₂/SiO₂ nanocatalyst for the photocatalytic and sonophotocatalytic degradation of chlorpyrifos