Sol–gel synthesis of Au/TiO2 thin films for photocatalytic degradation of phenol in sunlight

Sonawane, Ravindra S.; Dongare, Mohan K.

doi:10.1016/j.molcata.2005.07.043

Cited by 249 publications

(143 citation statements)

References 31 publications

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“…A broad exothermic peak at around 460-540°C is attributed to the phase transformation from the amorphous to anatase phase. The crystallization temperature of anatase phase in this study is similar to that of other investigations (Harizanov et al, 2001;Yu et al, 2001;Sonawane and Dongare, 2006). A board exothermic peak at around 580-680°C and extending to 750°C is attributed to the phase transformation from the anatase to rutile phase, similar to those reported by studies (Chhor et al, 1992;Qin et al, 1994).…”

Section: Thermal Analysis Of V/tiosupporting

confidence: 91%

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Hung

Chen

Chu

2014

Aerosol Air Qual. Res.

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The nano-sized V/TiO 2 prepared by a sol-gel method calcined at 500°C for 3 h was characterized in this study. The synthesized photo-catalysts were used for the photo-degradation of 1, 2-dichloroethane (1, 2-DCE). From X-ray powder diffraction data, the crystal phase presents the mixture of anatase and rutile phases with anatase the dominant phase. From TEM images, the crystallites of photo-catalysts are spherical particles with a crystallite size about 10-20 nm. UV-Visible absorption spectra of V/TiO 2 show a slightly increase in absorbance in the visible light region with the increasing vanadium ion doping concentration. The X-ray photoelectron spectroscopy results indicate that the doped vanadium ions exist in the form of V (IV). The V (IV) may alleviate the surface poison phenomenon and act as both h + /e -traps to reduce the recombination rate of h + /e -pairs, and the optimum vanadium doping amount is 0.01 mol%. The products and byproducts of 1, 2-DCE photo-degradation include H 2 O, CO, CO 2 , C 2 H 5 Cl, CH 2 Cl 2 , and HCl.

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Section: Thermal Analysis Of V/tiosupporting

confidence: 91%

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Hung

Chen

Chu

2014

Aerosol Air Qual. Res.

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“…At the interface, electrons and holes migrate between phases depending on the relative energies of their conduction and valence bands [8]. Incorporation of silver [40] and gold nanoparticles [41] to mesoporous titania coatings via sol-gel processes have reported to increase the photocatalytic rate by increasing the photo response of TiO 2 in visible light. The exposure of nanoparticles to the medium may result in undesirable corrosion or dissolution of metals during repeating photocatalytic reactions which can be avoided by incorporating the metal into titania as core-shell nanocomposite [42].…”

Section: Phase Separated Semiconductorsmentioning

confidence: 99%

Thin Films for Advanced Glazing Applications

et al. 2016

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Functional thin films provide many opportunities for advanced glazing systems. This can be achieved by adding additional functionalities such as self-cleaning or power generation, or alternately by providing energy demand reduction through the management or modulation of solar heat gain or blackbody radiation using spectrally selective films or chromogenic materials. Self-cleaning materials have been generating increasing interest for the past two decades. They may be based on hydrophobic or hydrophilic systems and are often inspired by nature, for example hydrophobic systems based on mimicking the lotus leaf. These materials help to maintain the aesthetic properties of the building, help to maintain a comfortable working environment and in the case of photocatalytic materials, may provide external pollutant remediation. Power generation through window coatings is a relatively new idea and is based around the use of semi-transparent solar cells as windows. In this fashion, energy can be generated whilst also absorbing some solar heat. There is also the possibility, in the case of dye sensitized solar cells, to tune the coloration of the window that provides unheralded external aesthetic possibilities. Materials and coatings for energy demand reduction is highly desirable in an increasingly energy intensive world. We discuss new developments with low emissivity coatings as the need to replace scarce indium becomes more apparent. We go on to discuss thermochromic systems based on vanadium dioxide films. Such systems are dynamic in nature and present a more sophisticated and potentially more beneficial approach to reducing energy demand than static systems such as low emissivity and solar control coatings. The ability to be able to tune some of the material parameters in order to optimize the film performance for a given climate provides exciting opportunities for future technologies. In this article, we review recent progress and challenges in these areas and provide a perspective for future trends and developments.

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“…Generally the enhancement in activity is attributed to an increased rate of charge separation and/or decreasing charge carrier recombination velocity [19,21,23]. The effect of the deposition of noble metals on the surface chemical properties of the catalyst (semiconductor oxide) is typically not taken into consideration.…”

Section: Effect Of the Preparation Procedures On Catalyst Constitutionmentioning

confidence: 99%

“…Various studies show that metal deposition enhances the photocatalytic activity of TiO 2 in photo degradation reactions in the aqueous phase [14][15][16], as well as in gas phase applications [17,18]. Besides modification by Pt or Pd, modification of Titania by Au has recently been reported to enhance performance in photocatalytic applications involving waste water treatment [19][20][21][22]. Most of these studies attribute the enhancement in activity to a decreasing charge carrier recombination velocity [19-21, 23, 24]: a result of localization of electrons on the metal particles.…”

Section: Introductionmentioning

confidence: 99%

How Gold Deposition Affects Anatase Performance in the Photo-catalytic Oxidation of Cyclohexane

et al. 2009

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Gold deposition on Hombikat UV100 was found to negatively affect the activity of this Anatase catalyst in selective photo-oxidation of cyclohexane. By ammonia TPD and DRIFT spectroscopy it was determined that the Au deposition procedure leads to a significant decrease in OH-group density (mol m -2 BET ) on Hombikat, suggesting that the amount of surface OH-groups, rather than the presence or absence of Au, is determining the catalytic performance. The importance of surface OH-groups was demonstrated by comparing the performance of Hombikat (with and without Au deposition) to surface propoxylated TiO 2 , synthesized by a sol-gel method from titanium (IV) isopropoxide. The effect of the deposition recipe of noble metals on the surface composition of TiO 2 should thus be taken into account in evaluating and explaining photocatalytic performance of TiO 2 modified by noble metals (Au), in particular in non-aqueous phase reactions.

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Sol–gel synthesis of Au/TiO2 thin films for photocatalytic degradation of phenol in sunlight

Cited by 249 publications

References 31 publications

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Photocatalytic Degradation of 1, 2-dichloroethane by V/TiO2: The Mechanism of Photocatalytic Reaction and Byproduct

Thin Films for Advanced Glazing Applications

How Gold Deposition Affects Anatase Performance in the Photo-catalytic Oxidation of Cyclohexane

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