Kinetics and mechanism of the photocatalytic degradation of acetic acid in absence or presence of O 2

Ngo, Son; Betts, Lynn M.; Dappozze, F.; Ponczek, Milena; George, Christian; Guillard, C.

doi:10.1016/j.jphotochem.2017.02.019

Cited by 27 publications

(28 citation statements)

References 36 publications

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“…Methane formation during the photocatalytic decomposition of HAc is supposed to follow the so-called photo-Kolbe reaction (Equation (9)), CH 3 COOH + h + → CH 3 − + CO 2 + H + the main products of which, CH 4 and CO 2 [7,48,49,50], are ideally produced in CH 4 /CO 2 molar ratio equal to 1. However, it is interesting to note that in the obtained results, the amount of CO 2 produced is higher than the amount of CH 4 , being the CH 4 /CO 2 ratio lower than one for all the tested catalysts.…”

Section: Resultsmentioning

confidence: 99%

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

et al. 2018

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The commercial P25 titania has been modified with transition metallic species (Cr, Co, Ni, and Cu), added by impregnation with aqueous solutions of the corresponding nitrates. The preparation procedure also includes a heat treatment (500 °C) in argon to decompose the nitrates, remove impurities and to strengthen the metal–TiO2 interaction. The catalysts have been thoroughly characterized using N2 adsorption, scanning electron microscopy (SEM), X-ray diffraction (XRD), UV-visible diffuse-reflectance spectroscopy (UV-vis DRS) and X-ray photoelectron spectroscopy (XPS), and have been tested in the aqueous phase decomposition of acetic acid and in the gas phase oxidation of propene, using an irradiation source of 365 nm in both cases. The photocatalytic activity of the four metal-containing catalysts varies with the nature of the metallic species and follows a similar trend in the two tested reactions. The effect of the nature of the added metallic species is mainly based on the electrochemical properties of the supported species, being Cu/P25 (the sample that contains copper) the best performing catalyst. In the photodecomposition of acetic acid, all the metal-containing samples are more active than bare P25, while in the gas phase oxidation of propene, bare P25 is more active. This has been explained considering that the rate-determining steps are different in gas and liquid media.

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Section: Resultsmentioning

confidence: 99%

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

et al. 2018

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“…11. According to the literature, the photocatalytic degradation of ethanoic acid proceeded both in liquid and gas phase [77,78]. The degradation occured by decarboxylation and by oxidation involving the holes and the hydroxyl radicals.…”

Section: Fig 11mentioning

confidence: 99%

Effects of ZnO quantum dots on the photostability of acrylate photopolymers used as recording materials

Goourey

Wong-Wah-Chung

Balan

et al. 2018

Polymer Degradation and Stability

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ZnO quantum dots, QDs (5 nm diameter) by their photogenerated charge carriers clearly influence the degradation of the acrylate host matrix, under conditions simulating solar light.As a result, QDs undergo a partial quenching of their fluorescence. To rationalize this influence, the investigation requires understanding the photochemical behavior of the acrylate photopolymer (carrier of ester and ether groups) in the absence of nanofiller. The matrix undergoes simultaneously a post-polymerization and photooxidative degradation. Infrared analysis and headspace gas chromatography coupled with mass spectrometry reveal that the main volatile organic compounds result from the oxidation of the ether groups, supposed to be the primary sites of degradation.The nanofiller increases the rate of degradation. Also, the concentration of the volatile organic compounds is all the more important as the doping percentage increases. However, the photostability of ZnO/polymer material strongly depends on the size of the nanoparticles.Whereas ZnO QDs display a photocatalytic effect, nanoparticles with a bigger size (10-30 nm) exhibit an unexpected UV-screening effect.

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“…The kinetics and mechanism of the photocatalytic degradation of acetic acid using TiO 2 P25 powder was already well studied [20].…”

Section: Comparative Study Between Tio 2 Powder and Tio 2 Coated On Luminous Textilementioning

confidence: 99%

Application of Luminous Textile Coated by Tio2 For Photocatalytic Removal of Acetic Acid, Formaldehyde and Toluene from Indoor Air

Hamandi

Ngo

Dappozze

et al. 2019

JTSFT

Self Cite

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Luminous textile coated by silica and TiO2 is studied for indoor air treatment. The textile aging induced by UV exposure in the presence of TiO 2 coating was studied, showing a good durability of the textile after protection by Silica layer unlike silica-free textile. Interesting photocatalytic activity was achieved for the photocatalytic luminous textile to remove three different VOCs in air which are acetic acid (AA), formaldehyde and toluene. The effect of number of photons and residence time was carefully highlighted for both TiO 2 P25 in powder or supported in the luminous textile. Then, a comparative study, between the classic system composed of TiO 2 powder and the innovative system integrating photocatalyst and light, was described. The advantage of the photocatalytic luminous textile is their performance associated to an important energy gain due to the use of one UV-LED to homogeneously irradiate an important surface of textile allowing the development of compact photocatalytic device.

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Kinetics and mechanism of the photocatalytic degradation of acetic acid in absence or presence of O 2

Cited by 27 publications

References 36 publications

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

TiO2 Modification with Transition Metallic Species (Cr, Co, Ni, and Cu) for Photocatalytic Abatement of Acetic Acid in Liquid Phase and Propene in Gas Phase

Effects of ZnO quantum dots on the photostability of acrylate photopolymers used as recording materials

Application of Luminous Textile Coated by Tio2 For Photocatalytic Removal of Acetic Acid, Formaldehyde and Toluene from Indoor Air

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