Enhancement of photocatalytic oxidation of oxalic acid by gold modified WO3/TiO2 photocatalysts under UV and visible light irradiation

Iliev, V.; Tomova, D.; Rakovsky, Slavcho; Eliyas, A.; Puma, Gianluca Li

doi:10.1016/j.molcata.2010.05.012

Cited by 138 publications

(67 citation statements)

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“…Hence, the k obs decrease as the [electrolytes] increases. The difference in the action of 3 , and 2 4 ion is due to the fact that 2 4 is specifically, i.e., high polarizability, incorporated into the reaction site [42].…”

Section: Salt Effect Resultsmentioning

confidence: 99%

Silver Nanoparticles: Green Route, Stability and Effect of Additives

Khan¹,

Hussain²,

Kumar³

et al. 2011

JBNB

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Section: Salt Effect Resultsmentioning

confidence: 99%

Silver Nanoparticles: Green Route, Stability and Effect of Additives

Khan¹,

Hussain²,

Kumar³

et al. 2011

JBNB

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“…The oxygen over-voltage is high on the stannates; the level O 2/ H 2 O is located far above the valence band and oxygen does not evolve on Ba 2 SnO 4 . So, the reduction is achieved in presence of oxalic acid as hole scavenger which promotes the charges separation and protects the oxide against photo corrosion (Lahmar et al 2012;Iliev et al 2010). …”

Section: Introductionmentioning

confidence: 99%

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

et al. 2013

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The photo-electrochemical properties of the layered perovskite Ba 2 SnO 4 , prepared by nitrate route are reported for the first time. The oxide exhibits a direct optical transition at 2.98 eV, attributed to the charge transfer O 2-: 2p ? Sn 4? : 5s and possesses a chemical stability over the whole pH range. The Mott Schottky plot in acidic medium is characteristic of n type conductivity with a flat band potential E fb of -0.84 V SCE and an electron density N D of 1.14 9 10 17 cm -3 . The electrochemical impedance spectroscopy reveals the bulk and grain boundaries contributions. Ba 2 SnO 4 is of interest for the environmental protection. At pH 2.5, its conduction band (CB, -0.86 V SCE ) is below the HCrO 4 -level, yielding a spontaneous reduction to Cr 3? under UV light. The reduction is optimized with respect to the Cr(VI) concentration. The photo reduction follows a pseudo-first-order kinetic and the data fit well the Langmuir-Hinshelwood (L-H) model with an apparent rate constant of 0.18 h -1 for an initial concentration of 50 ppm. The chromate reduction under solar light is studied under optimized conditions. In presence of oxalic acid, 73 % of initial concentration disappears after *2 h of irradiation.

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“…Another example is that sugar can be decomposed into carbon dioxide and hydrogen gas using titanium dioxide powders loaded with RuO 2 (wt10%) and Pt (wt5%) particles under irradiation (Kawai and Sakata 1980 ) . Moreover, the photocatalysts loaded with noble metal particles in the suspension aqueous solution were broadly utilized to degrade the refractory organic pollutants (Serpone and Pelizzetti 1989 ;Kamat 1993 ;Pelizzetti et al 1993 ;Rajeshwar 1995 ;Hoffmann et al 1995 ;Halmann 1996 ;Fujishima et al 1999 ;Kozlova and Vorontsov 2006 ;Ren et al 2009 ;Iliev et al 2010 ;Rupa et al 2009 ) in the presence of oxygen, and the catalytic activities The photo-generated electrons fl ow into the inert platinum electrode to reduce hydrogen ions into hydrogen gas and the photo-generated holes leave to oxidize the water to release oxygen gas upon irradiation Fig. 4.2 Semiconductor photocatalyst suspended in aqueous solution.…”

Section: Principle Of Photocatalysismentioning

confidence: 99%

Magnetic Nano-photocatalysts: Preparation, Structure, and Application

Liu

2011

Environmental Chemistry for a Sustainable World

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Photocatalytic degradation of organic pollutants using suspended and dispersed nanosemiconductor photocatalysts in wastewater has unique advantages including high activity, low cost, solar utilization, and complete mineralization. However recovery and reuse of photocatalysts are diffi cult because fi ne particles are easily discharged in the waterfl ow. Immobilization of photocatalysts on supports such as glass and zeolite decreases activities due to the low specifi c area and slow mass transfer. Furthermore, a large amount of photocatalysts will lead to color contamination if they are released at industrial scale. Therefore, it is necessary to develop photocatalysts with separation function for reusable and cyclic application. The concept of magnetic photocatalysts with separation function was raised to benefi t from high activity and enable nanosemiconductor photocatalysts to be reused.

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Enhancement of photocatalytic oxidation of oxalic acid by gold modified WO3/TiO2 photocatalysts under UV and visible light irradiation

Cited by 138 publications

References 50 publications

Silver Nanoparticles: Green Route, Stability and Effect of Additives

Silver Nanoparticles: Green Route, Stability and Effect of Additives

Preparation and characterization of nano structured Ba2SnO4 as a novel photocatalyst material for the chromate reduction

Magnetic Nano-photocatalysts: Preparation, Structure, and Application

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