Photocatalytic oxidation of ethanol using ultrasonic modified TiO2; an in-situ diffuse reflectance infrared spectroscopy study

Elavarasan, Munirathinam; Uma, Kasimayan; Yang, Thomas C.-K.

doi:10.1016/j.rinp.2019.102237

Cited by 14 publications

(8 citation statements)

References 34 publications

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“…Elavarasan et al . reported similar findings after irradiating P25 with an ultrasonic power density of 1000 W/L for several hours at an adjusted pH of 11, but in addition to the surface hydroxylation, they also observed an increase in interplanar distance of the anatase (1 0 1) plane with longer sonication times, which they explained by having an increased concentration of V O in the lattice [23] . Osorio–Vargas et al on the other hand treated P25 for 6 h with a power density of 1200 W L –1 at neutral pH, and partly ascribed the increased visible light absorption of their ultrasonically treated P25 TiO 2 to V O species generated by the shockwaves and energetic interparticle collisions resulting from the acoustic cavitation [24] .…”

Section: Introductionsupporting

confidence: 55%

Black titania by sonochemistry: A critical evaluation of existing methods

Raes,

Ninakanti,

Van den Bergh

et al. 2023

Ultrasonics Sonochemistry

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Section: Introductionsupporting

confidence: 55%

Black titania by sonochemistry: A critical evaluation of existing methods

Raes,

Ninakanti,

Van den Bergh

et al. 2023

Ultrasonics Sonochemistry

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“…Moreover, the remaining peaks at 25.38, 38.23, 48.47, 54.71, 56.01, 27.58, 36.90, 41.60, and 55.0° are assigned to the (101), (004), (200), (105), (211), (110), (101), (210), and (211) planes of TiO 2 (P25) respectively [ 31 ]. It can be seen from XRD peaks that the intensities of Pd 2 Cu peaks are dominated by the P25 crystalline peaks.…”

Section: Resultsmentioning

confidence: 99%

“…An outlet of the reaction chamber was connected with the mass spectrum during the collection of DRIFT spectra. Meanwhile, the mass spectra wer also collected (QMS 100 Series, capillary; PEEK, and glass-lined plastic inlet type, pressure 10 mbar to 1 bar, Quadrupole type spectrometer, Faraday cup standard electron multiplier optional detector) [ 31 ].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, DRIFT analysis was applicable to test non-transparent and indispersable materials. In our previous work, we have demonstrated photocatalytic efficiency and the reaction mechanism using DRIFT in the oxidation of ethanol [ 31 ]. The solid-state photodegradation mechanism was evaluated by DRIFT for the surface adsorbed AB-9 dye on titanium dioxide (TiO 2 ) [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Highly Efficient Photothermal Reduction of CO2 on Pd2Cu Dispersed TiO2 Photocatalyst and Operando DRIFT Spectroscopic Analysis of Reactive Intermediates

et al. 2022

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The photocatalytic conversion of CO2 to fuels using solar energy presents meaningful potential in the mitigation of global warming, solar energy conversion, and fuel production. Photothermal catalysis is one promising approach to convert chemically inert CO2 into value-added chemicals. Herein, we report the selective hydrogenation of CO2 to ethanol by Pd2Cu alloy dispersed TiO2 (P25) photocatalyst. Under UV-Vis irradiation, the Pd2Cu/P25 showed an efficient CO2 reduction photothermally at 150 °C with an ethanol production rate of 4.1 mmol g−1 h−1. Operando diffuse reflectance infrared Fourier transform (DRIFT) absorption studies were used to trace the reactive intermediates involved in CO2 hydrogenation in detail. Overall, the Cu provides the active sites for CO2 adsorption and Pd involves the oxidation of H2 molecule generated from P25 and C–C bond formation.

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“…The oxidation of ethanol to the CO 2 gas phase was confirmed by the presence of acetate and aldehyde spectra at 2331 and 2380 cm −1 , respectively. A high rate of ethanol oxidation was observed for RGO-(30 wt %) SiO 2 @α-Fe 2 O 3 nanocomposites that proved the high oxygen defects 59 and a reduction in the electron-hole recombination when compared with other nanocomposities as shown in S6. Figure 7(c) shows the normalized peak intensity of 1442, 1581, and 1623 cm −1 as the functions of the different time intervals.…”

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confidence: 81%

In-situ DRIFT investigation of photocatalytic reduction and oxidation properties of SiO2@α-Fe2O3 core-shell decorated RGO nanocomposite

Uma

Arjun

Mohan

et al. 2020

Sci Rep

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in this work, Sio 2 @α-fe 2 o 3 core-shell decorated RGo nanocomposites were prepared via a simple sol-gel method. The nanocomposites were prepared with different weight percentages (10, 30, and 50 wt %) of the Sio 2 @α-fe 2 o 3 core-shell on RGO, and the effects on the structural and optical properties were identified. The photocatalytic reduction and oxidation properties of the nanocomposites in the gas phase were assessed through the reduction of co 2 and oxidation of ethanol using in-situ diffuse-reflectance infrared fourier transform spectroscopy (DRIFT). The prepared nanocomposite with (30 wt %) of SiO 2 @αfe 2 o 3 showed superior photocatalytic activity for the gas phase reduction of co 2 and oxidation of ethanol. enhancement in the activity was also perceived when the light irradiation was coupled with thermal treatment. the DRift results for the nanocomposites indicate the active chemical conversion kinetics of the redox catalytic effect in the reduction of CO 2 and oxidation of ethanol. further, the evaluation of photoelectrochemical co 2 reduction performance of nanocomposites was acquired by linear sweep voltammetry (LSV), and the results showed a significant improvement in the onset-potential (-0.58 V) for the RGO (30 wt %)-SiO 2 @α-fe 2 o 3 nanocomposite. Photocatalysis is an extensively studied process by many researchers to deal with various applications mostly on energy and environmental problems. In recent years, researchers have been focused on reduction of CO 2 into fuels such as carbon monoxide, hydrocarbons, and alcohol using solar driven photocatalysts 1,2. Under the irradiation of light on the photocatalyst, the electrons in the CB and holes in the VB could be involved simultaneously in the reduction and oxidation reactions, respectively. Thermodynamically, the reduction of CO 2 is an uphill reaction, so the band edge position of CB should be more negative than the reduction potential of CO 2 3,4. Meanwhile, for water oxidation, the VB band edge should be more positive. The efficiency of CO 2 reduction is determined by the various kinetic parameters, which is mainly from binding of CO 2 with the catalyst surface. This process takes place with reaction of CO 2 + 2 e− → CO + 1 / 2 O 2 , which combined with free energy of 257 KJ/mol. Finally, the CO would react with hydrogen to form formate and carbonates. Besides, controlled oxidation of ethanol is very demanding for the application of bioethanol, which is preferred for cost-effective organic synthesis 5,6. Ethanol could be oxidized under light irradiation using photocatalyst materials. Photo-induced electrons and holes from the catalyst could react with O 2 and H 2 O, which generates the reactive oxygen species and.OH, and these species oxidize the adsorbed ethanol. There are many methods which can be used for the reduction of CO 2. Electrochemical 7 , photo-catalytic 8 , and hydrothermal 9,10 methods have all been used, but it is the electrochemical and photocatalytic conversion of CO 2 into fuels such as CO, hydrocarbons, and alcohol whic...

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Photocatalytic oxidation of ethanol using ultrasonic modified TiO2; an in-situ diffuse reflectance infrared spectroscopy study

Cited by 14 publications

References 34 publications

Black titania by sonochemistry: A critical evaluation of existing methods

Black titania by sonochemistry: A critical evaluation of existing methods

Highly Efficient Photothermal Reduction of CO2 on Pd2Cu Dispersed TiO2 Photocatalyst and Operando DRIFT Spectroscopic Analysis of Reactive Intermediates

In-situ DRIFT investigation of photocatalytic reduction and oxidation properties of SiO2@α-Fe2O3 core-shell decorated RGO nanocomposite

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