A fine route to tune the photocatalytic activity of TiO2

Sakthivel, S.; Hidalgo, M.C.; Bahnemann, Detlef W.; Geißen, Sven‐Uwe; Murugesan, V.; Vogelpohl, Alfons

doi:10.1016/j.apcatb.2005.08.011

Cited by 129 publications

(67 citation statements)

References 50 publications

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“…material has not been discussed. Sakthivel et al [30]. synthesised TiO 2 via the forced hydrolysis of TiOSO 4 at room temperature by using base hydrolysing agents (NaOH, Na 2 CO 3 and NaHCO 3 ).…”

Section: Catalyst Structurementioning

confidence: 99%

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

et al. 2016

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a b s t r a c t Nanosized TiO 2 catalyst was successfully prepared by a simple green procedure and used in liquid phase aldol condensation of furfural with acetone, a key step in bio-fuel processing. In order to determine the effect of calcination temperature on catalytic properties of TiO 2 , the as-prepared TiO 2 and calcined TiO 2 (150-900• C) were studied by XRD, BET, TPD-CO 2 /NH 3 , TGA/DTG and FTIR evaluation. The catalytic performance of TiO 2 samples in aldol condensation of furfural with acetone was evaluated and compared with that of Mg-Al hydrotalcites and a BEA zeolite. These experiments showed that uncalcined TiO 2 possessed reasonable activity in aldol condensation of furfural to acetone and resulted in commonly produced condensation products. The observed catalytic behavior of TiO 2 could be competitive with that reported for other inorganic solids. The calcination of TiO 2 resulted, however, in a decrease in its catalytic activity due to extensive dehydration and surface dehydroxylation as well as due to changes of textural properties resulting in a decrease in the amount of accessible active sites. Thanks to its advanced properties, nanosized TiO 2 is a promising catalyst for aldol condensation of furfural with acetone and could broaden possibilities for optimizing conditions for bio-fuel production.

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Section: Catalyst Structurementioning

confidence: 99%

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

et al. 2016

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“…Enríquez and Pichat [29] showed that the sintering temperature has a different net effect on the photocatalytic removal rate of various organic pollutants in water. The optimisation of the experimental conditions, such as pH, calcination temperature, hydrolysing agent, temperature and ageing time allowed to obtain TiO 2 samples with high activity [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…In this study, we report the synthesis of efficient TiO 2 catalysts prepared under similar conditions by thermohydrolysis of TiOSO 4 in water at 100°C. The preparation method is very simple and environmentally friendly since it does not require the use of other reagents [9][10][11][12][13][14][15][16][17][18][19][20] or relatively high temperatures [21][22][23][24][25][26][27][28]. Many literature publications have studied the behaviour of the photocatalysts toward the degradation of various organic substrates, and comparisons of photoactivities have been made either in an aqueous medium or in the gas-phase.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

et al. 2013

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Nanocrystalline TiO 2 photocatalysts were synthesized in mild conditions by thermohydrolysis of TiOSO 4 in water at 100°C and post-calcination treatment at various temperatures. The TiO 2 powders were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, specific surface area determinations, scanning electron microscopy and electron paramagnetic resonance measurements. The photoactivity of the samples was tested employing the photodegradation of 4-nitrophenol in liquid-solid regimen and the photooxidation of gaseous 2-propanol. The best results were obtained with the powder calcined at 600°C for 10 h. Surprisingly, the not calcined sample was the most active for the abatement of NO x under irradiation.

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“…Titanium hydroxide was precipitated at pH = 8.6 from 0.5 M titanyl sulphate aqueous solution [28,29]. In particular, 40 g of TiOSO 4 xH 2 SO 4 yH 2 O (Aldrich) were dissolved in 300 mL of distilled water at room temperature under vigorous stirring.…”

Section: Synthesis Of Supportsmentioning

confidence: 99%

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

et al. 2016

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Abstract:New gold catalysts supported on CeO 2 , ZrO 2 and TiO 2 were synthesized by two different techniques: deposition-precipitation and colloidal method. The role of the surfactant (PVA, PVP, THPC) was also investigated. The catalysts were tested in the oxidation of glucose to gluconic acid, in aqueous environment and under mild conditions (60˝C and atmospheric pressure). TEM and SEM analyses have shown that the small size of gold nanoparticles is a necessary condition, but not sufficient for a good conversion. In fact, for an active sample, we have verified that the excess of surfactant must be removed because it would coat the surface of the catalyst. The surfactant, however, should not be completely eliminated, since it has the fundamental role of stabilizing the sample preventing nanoparticles from aggregation. It was evidenced that both the synthetic approach and the kind of support affect the catalysts' activity. In fact, by focusing on the three different supports, with all the preparation methods, the ceria has proved to be the best support. This is due to its ability to obtain small gold nanoparticles and to its ability to accumulate oxygen. The most appropriate synthesis methodology proved to be the colloidal method with PVA. Recyclability issue was investigated too.

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A fine route to tune the photocatalytic activity of TiO2

Cited by 129 publications

References 50 publications

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

Nanosized TiO2—A promising catalyst for the aldol condensation of furfural with acetone in biomass upgrading

Preparation and Photoactivity of Nanocrystalline TiO2 Powders Obtained by Thermohydrolysis of TiOSO4

Effects of Support and Synthetic Procedure for Sol-Immobilized Au Nanoparticles

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