Understanding promotion of photocatalytic activity of TiO 2  by Au nanoparticles

Amrollahi, Rezvaneh; Hamdy, Mohamed S.; Mul, Guido

doi:10.1016/j.jcat.2014.08.017

Cited by 45 publications

(35 citation statements)

References 31 publications

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“…This means that the detection of trapped electrons in P90 by EPR is due to the injection of electrons into the P90 conduction band after surface plasmon resonance, in agreement with previous work of Au supported P25 with smaller Au nanoparticles (\5 nm) [38,39] or of similar diameter [14]. Interestingly, our results are in contradiction with those recently reported on an Au-modified P25 with similar particle size, where near fields were proposed as main promoting effect in the oxidation of methylcyclohexane at 425 nm whilst no catalytic activity was found at a wavelength of 525 nm [40]. The authors based the assigned mechanism on a too short electron mean free path to allow electron injection and the predominance of field effects when there is some absorption overlap between Au and P25.…”

Section: Visible Lightsupporting

confidence: 78%

Light-Induced Processes in Plasmonic Gold/TiO2 Photocatalysts Studied by Electron Paramagnetic Resonance

et al. 2015

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X-band and W-band continuous-wave (CW) electron paramagnetic resonance (EPR) was used to study in situ light-induced (LI) mechanisms in commercial P90 titania (90 % anatase/10 % rutile) compared to plasmonenhanced Au-P90 photocatalyst. These materials were excited using UV and 532 nm visible light to generate different excitation states and distinguish pure charge separation from plasmon-assisted resonance processes. Up to nine different photoinduced species of trapped electrons and holes were identified. LI CW EPR of P90 is presented for the first time, showing a UV excitation response similar to the well-known mixed-phase P25 titania. It is shown that incorporation of Au nanoparticles in Au-P90 and formation of a Schottky junction affects the charge separation state of the catalyst under UV light. Moreover, Au impregnation activated P90 through plasmon 'hot' electron injection under visible light excitation (''plasmonic sensitization effect''). In general, EPR proved to be crucial to determine the different photoexciation paths and reactions that regulate plasmonic photocatalysis.

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Section: Visible Lightsupporting

confidence: 78%

Light-Induced Processes in Plasmonic Gold/TiO2 Photocatalysts Studied by Electron Paramagnetic Resonance

et al. 2015

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“…No change in the reaction rate is seen when using Pd/TiO 2 instead of Au/TiO 2 . The effect of LSPR of Au on the photocatalytic reactions has been studied by many workers including us in some details elsewhere and in this particular case may be linked to both near field effect or to hot electrons [28,[42][43][44][45]. Yet, the important point to take from this study is that these alone are not poised to generate hydrogen in large amounts in the absence of the needed light frequency to excite the semiconductor (in this case UV light for TiO 2 ).…”

Section: (D)mentioning

confidence: 99%

Comparing the Reaction Rates of Plasmonic (Gold) and Non-Plasmonic (Palladium) Metal Particles in Photocatalytic Hydrogen Production

et al. 2017

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“…Therefore, it can be deduced that the smaller particles would give higher surface area which is favorable for higher photocatalytic activity. This is likely due to many factors such as time taken for complete stirring of catalyst suspension, rate of stirring as well as temperature used during calcination [18] step potentially induced the formation of particle size.…”

Section: Scanning Electron Microscopy Analysismentioning

confidence: 99%

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

Abdullah

So'aib²,

Krishnan

2017

MJAS

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Composite catalyst ZnO/TiO 2 of molar ratio 0.75% was synthesized via sol gel method. The effect of preparation method on the crystal morphology was investigated. The catalyst particles were calcinated at 500 o C,550 o C and 600 °C for 3 hours. The XRD results revealed that calcination temperature controls the crystalline phase in terms of homogeneity and surface area of catalyst produced. The particle size was found to increase with calcination temperature suggesting the effect of different calcination temperatures on catalytic activity for complete degradation of phenol. The result found that ZnO/TiO 2 catalyst calcinated at 600 o C resulted in 70% phenol degradation within five hours of irradiation time under visible light. The kinetic behavior of phenol degradation was found to fit with pseudo first order Langmuir-Hinshelwood kinetic model. Keywords: sol gel, ZnO/TiO 2 catalyst, photocatalytic degradation, visible light, kinetic Abstrak Pemangkin komposit ZnO/TiO 2 dengan 0.75% nisbah molar telah di sintesis melalui kaedah sol gel. Kesan kaedah penyediaan pada morfologi kristal itu telah di selidiki. Zarah-zarah pemangkin telah dikalsinkan pada suhu 500 o C, 550 o C dan 600 o C selama 3 jam. Keputusan XRD menunjukkan suhu pengkalsinan mengawal fasa kristal dari segi kesamaan dan kawasan permukaan pemangkin dihasilkan. Saiz zarah didapati meningkat sejajar dengan peningkatan suhu pengkalsinan mencadangkan kesan suhu pengkalsinan yang berbeza pada aktiviti pemangkin untuk penyingkiran penuh fenol. Keputusan mendapati pemangkin ZnO/TiO 2 yang dikalsinkan pada 600 o C boleh menyebabkan 70% fenol terdegradasi bagi tempoh lima jam masa penyinaran di bawah cahaya nampak. Kelakuan kinetik degradasi fenol didapati sesuai dengan pseudo peringkat pertama model kinetik Langmuir -Hinshelwood.

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Understanding promotion of photocatalytic activity of TiO 2 by Au nanoparticles

Cited by 45 publications

References 31 publications

Light-Induced Processes in Plasmonic Gold/TiO2 Photocatalysts Studied by Electron Paramagnetic Resonance

Light-Induced Processes in Plasmonic Gold/TiO2 Photocatalysts Studied by Electron Paramagnetic Resonance

Comparing the Reaction Rates of Plasmonic (Gold) and Non-Plasmonic (Palladium) Metal Particles in Photocatalytic Hydrogen Production

EFFECT OF CALCINATION TEMPERATURE ON ZnO/TIO2 COMPOSITE IN PHOTOCATALYTIC TREATMENT OF PHENOL UNDER VISIBLE LIGHT

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