High selectivity in visible-light-driven partial photocatalytic oxidation of benzyl alcohol into benzaldehyde over single-crystalline rutile TiO2 nanorods

Li, Congju; Xu, Guangqing; Zhang, Baohong; Gong, Jian

doi:10.1016/j.apcatb.2011.12.003

Cited by 140 publications

(55 citation statements)

References 54 publications

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“…Visible-light-driven partial photocatalytic oxidation of alcohols was achieved over Pt nanoparticles supported on anatase TiO 2 [18], single-crystalline rutile TiO 2 nanorods [19] and over pure TiO 2 with selectivity of 99% [20]. It has been found that the addition of Brønsted acids [21] adsorbed onto TiO 2 dramatically accelerated the photocatalytic oxidation of alcohols without any loss of selectivity.…”

Section: Introductionmentioning

confidence: 97%

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Özcan

Yurdakal

Augugliaro

et al. 2013

Applied Catalysis B: Environmental

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a b s t r a c tThe photoelectrocatalytic partial oxidation of 4-methoxybenzyl alcohol in aqueous solution irradiated by near-UV light was carried out in a three-electrode batch reactor. TiO 2 films were either deposited by dip-coating of a TiO 2 sol onto a Ti foil and subsequent calcination or generated on Ti plates by thermal oxidation in air at 400-700 • C. The effects of the anode preparation method and bias potential values on conversion and selectivity to the corresponding aldehyde were investigated. The photoelectrocatalytic results were compared with the photocatalytic and electrocatalytic ones. The results indicated that no reaction occurred during the electrocatalytic experiments, whereas the photocatalytic reactivity was positively influenced by the application of a small bias (0.75 V vs. saturated calomel electrode). By applying the previous bias the highest initial degradation rates, r 0 , and selectivities to 4-methoxybenzaldehyde, S, were obtained in photoelectrocatalytic experiments by using Ti plate calcined at 500 • C (r 0 = 0.1507 mM h −1 , S = 85%) or TiO 2 film prepared by dip-coating and calcined at 700 • C (r 0 = 0.1339 mM h −1 , S = 90%). In order to investigate the influence of the substituent groups on reactivity and selectivity, photoelectrocatalytic runs with benzyl alcohol, 2-methoxybenzyl alcohol, 3-methoxybenzyl alcohol, 2,4-dimethoxybenzyl alcohol, 2,3,4-trimethoxybenzyl alcohol, 4-nitrobenzyl alcohol and 4-hydroxybenzyl alcohol have been performed. The selectivity and reactivity values increased by increasing the electron-donor properties of the substituent groups. This positive effect, however, was obtained only if the electron-donor group is in para or ortho position with respect to the alcoholic group.

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Section: Introductionmentioning

confidence: 97%

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Özcan

Yurdakal

Augugliaro

et al. 2013

Applied Catalysis B: Environmental

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“…35 Highly crystalline materials possess lower surface areas due to which the surface hydroxyl group density decreases and consequently result lower activity. Our photoactive nanocomposite material possessed a high surface area (292 m 2 g -1 , Table 1), and its TiO2 component has very small crystallite size of approx.…”

Section: Resultsmentioning

confidence: 99%

“…Metal oxide based catalysts such as TiO2, [11][12][13] Nb2O5, 14 and ZnO 15 have been well explored for the alcohol oxidation in presence of UV irradiation. Incorporation of various noble metals including Au, 16 Pd, 17 and Pt 18,19 on different photoactive catalyst supports has been reported to achieve improved activities even under visible light conditions.…”

Section: Introductionmentioning

confidence: 99%

Mild ultrasound-assisted synthesis of TiO 2 supported on magnetic nanocomposites for selective photo-oxidation of benzyl alcohol

Colmenares

Ouyang

Ojeda

et al. 2016

Applied Catalysis B: Environmental

115

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Mild ultrasound-assisted synthesis of TiO2 supported on magnetic nanocomposites for selective photo-oxidation of benzyl alcohol, Applied Catalysis B, Environmental http://dx.doi.org/10. 1016/j.apcatb.2015.10.034 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

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“…When the oxidation temperature was increased to 1073 K (Figure 33), nano-sized TiO2 needles grew rapidly and micron-sized columnar TiO2 crystals formed as the oxidation time was increased. The formation and growth of nano-sized TiO2 needles and micron-sized columnar TiO2 crystals have been discussed in many papers [49][50][51]. It should result from the preferential growth of TiO2 crystals in a specific direction.…”

Section: Focusing On Oxidation Timementioning

confidence: 99%

Review on the Photocatalyst Coatings of TiO2: Fabrication by Mechanical Coating Technique and Its Application

Guan

Líu

et al. 2015

Coatings

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This review presents the latest results of studies directed at photocatalyst coatings of titanium dioxide (TiO2) prepared by mechanical coating technique (MCT) and its application. Compared with traditional coating techniques, MCT is a simple, low cost and useful coating formation process, which is proposed and developed based on mechanical frictional wear and impacts between substrate materials and metal powder particles in the bowl of planetary ball mill. The formation process of the metal coatings in MCT includes four stages: The nucleation by adhesion, the formation and coalescence of discrete islands, formation and thickening of continuous coatings, exfoliation of continuous coatings. Further, two-step MCT was developed based on the MCT concept for preparing composite coatings on alumina (Al2O3) balls. This review also discusses the influence on the fabrication of photocatalyst coatings after MCT and improvement of its photocatalytic activity: oxidation conditions, coating materials, melt salt treatment. In this review, the oxidation conditions had been studied on the oxidation temperature of 573 K, 673 K, 773 K, 873 K, 973 K, 1173 K and 1273 K, the oxidation time of 0.5 h, 1 h, 3 h, 10 h, 15 h, 20 h, 30 h, 40 h, and 50 h. The photocatalyst coatings showed the highest photocatalytic activity with the oxidation condition of 1073 K for 15 h. The metal powder of Ti, Ni and Cr had been used as the coating materials. The composite metal powder could affect the surface structure and photocatalytic OPEN ACCESSCoatings 2015, 5 426 activity. On the other hand, the melt salt treatment with KNO3 is an effective method to form the nano-size structure and enhance photocatalytic activity, especially under visible light.

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High selectivity in visible-light-driven partial photocatalytic oxidation of benzyl alcohol into benzaldehyde over single-crystalline rutile TiO2 nanorods

Cited by 140 publications

References 54 publications

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Photoelectrocatalytic selective oxidation of 4-methoxybenzyl alcohol in water by TiO2 supported on titanium anodes

Mild ultrasound-assisted synthesis of TiO 2 supported on magnetic nanocomposites for selective photo-oxidation of benzyl alcohol

Review on the Photocatalyst Coatings of TiO2: Fabrication by Mechanical Coating Technique and Its Application

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