Photocatalytic oxidation of propan-2-ol in the liquid phase by rutile

Cundall, R. B.; Rudham, Robert; Salim, Mohammad

doi:10.1039/f19767201642

Cited by 96 publications

(33 citation statements)

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“…Again, catalase addition after illumination ceased did not result in 0, evolution. This lack of detection of H20z with Ti0, is consistent with previous experiments (2,(16)(17)(18)(19). If H202 is being continuously generated in this system but is present only as a transient, then it is argued that injection of catalase at a point during illumination should reveal its presence.…”

Section: Results and Discussion (I) 0 Uptakesupporting

confidence: 79%

“…It is well known that when aqueous dispersions of such pigments are irradiated with band gap radiation that hydrogen peroxide is formed in the external solution in measurable quantities. 'This does not appear to be the case, however, for unreduced titanium dioxide and, despite numerous experiments (2,(16)(17)(18)(19), its photochemical formation has yet to be proven. Rao et (11.…”

Section: Introductionmentioning

confidence: 92%

See 1 more Smart Citation

Photogeneration of hydrogen peroxide in aqueous TiO₂ dispersions

Harbour¹,

Tromp²,

Hair³

1985

Can. J. Chem.

140

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Evidence is presented which demonstrates that titanium dioxide does in fact photogenerate H2O2 in the presence of the donor sodium formate. However, this H2O2 has only a transient existence in aqueous dispersions. This was confirmed by experiments in which H2O2 was injected into the dispersion. The reasons for the lability of H2O2 are discussed and possible mechanisms presented. Electron paramagnetic resonance experiments using spin traps reveal that photolysis of TiO2 dispersion generates •OH radicals in the donor-free case while •CO2 radicals are observed in the presence of formate. These results are also consistent with H2O2 generation.

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Section: Results and Discussion (I) 0 Uptakesupporting

confidence: 79%

Section: Introductionmentioning

confidence: 92%

Photogeneration of hydrogen peroxide in aqueous TiO₂ dispersions

Harbour¹,

Tromp²,

Hair³

1985

Can. J. Chem.

140

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“…Hence, for example, during a typical photocatalytic oxidation of organic pollutants on TiO 2 in aqueous solutions, the reacting holes are scavenged either directly by the pollutant or by adsorbed hydroxyl ions to produced hydroxyl radicals which can then oxidize the pollutant due to their high oxidizing power. Simultaneously, the photogenerated electrons reduce molecular oxygen to a superoxide radical (E O2/O2 −• = −0.16 V versus NHE [130]) which can then undergo further reactions to produce hydroxyl radicals [17,[131][132][133][134]. It is obvious that the positions of the conduction and valence band edges are of crucial importance here since these give information on the reductive and oxidative power of photogenerated electrons and holes, respectively.…”

Section: Introductionmentioning

confidence: 99%

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

Beránek

2011

Advances in Physical Chemistry

332

183

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TiO 2 -based nanomaterials play currently a major role in the development of novel photochemical systems and devices. One of the key parameters determining the photoactivity of TiO 2 -based materials is the position of the band edges. Although its knowledge is an important prerequisite for understanding and optimizing the performance of photochemical systems, it has been often rather neglected in recent research, particularly in the field of heterogeneous photocatalysis. This paper provides a concise account of main methods for the determination of the position of the band edges, particularly those suitable for measurements on nanostructured materials. In the first part, a survey of key photophysical and photochemical concepts necessary for understanding the energetics at the semiconductor/solution interface is provided. This is followed by a detailed discussion of several electrochemical, photoelectrochemical, and spectroelectrochemical methods that can be applied for the determination of band edge positions in compact and nanocrystalline thin films, as well as in nanocrystalline powders.

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“…The various types and grades of titania discussed in this chapter are listed in Table 2. The oxidation of 2-propanol to yield acetone is a specific methodology and this has been related to oxygen consumption during irradiation of the medium in the presence of the titania particles [30]. The hydroxyl content relates to the concentration of hydroxyl functionalities present on the pigment particles and is often related to activity [31].…”

Section: Photoactivity Tests For 2-propanol Oxi-dation and Hydroxyl Cmentioning

confidence: 99%

Photocatalytic Surfaces: Environmental Benefits of Nanotitania§~!2008-09-11~!2008-09-20~!2009-01-30~!

Allen¹,

Edge²,

Caballero³

et al. 2010

TOMSJ

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Abstract:The use of photocatalytic titania nanoparticles in the development of self-cleaning and depolluting paints and microbiological surfaces is demonstrated. In the former case surface erosion and sensitised photooxidation is shown to be controlled by the use of catalytic grades of anatase nanoparticles. For environmental applications in the development of coatings and cementitious materials for destroying atmospheric pollutants such as nitrogen oxides (NOX) stable substrates are also illustrated with photocatalytic nanoparticles. Here porosity of the coatings through calcium carbonate doping is shown to be crucial in the control of the effective destruction of atmospheric NOX gases. Good environmental stability of the coatings is also crucial for long term durability and this aspect is examined for a variety of material substrates. For the development of microbiological substrates for the destruction of harmful bacteria/fungi effective nanoparticle anatase titania is shown to be important with hydrated high surface area particles giving the greatest activity. Data from commercial pilot studies is used to signify the important practicalities of this type of new technology.

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Photocatalytic oxidation of propan-2-ol in the liquid phase by rutile

Cited by 96 publications

References 0 publications

Photogeneration of hydrogen peroxide in aqueous TiO₂ dispersions

Photogeneration of hydrogen peroxide in aqueous TiO₂ dispersions

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials

Photocatalytic Surfaces: Environmental Benefits of Nanotitania§~!2008-09-11~!2008-09-20~!2009-01-30~!

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Photocatalytic oxidation of propan-2-ol in the liquid phase by rutile

Cited by 96 publications

References 0 publications

Photogeneration of hydrogen peroxide in aqueous TiO2 dispersions

Photogeneration of hydrogen peroxide in aqueous TiO2 dispersions

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO2‐Based Nanomaterials

Photocatalytic Surfaces: Environmental Benefits of Nanotitania§~!2008-09-11~!2008-09-20~!2009-01-30~!

Contact Info

Product

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Photogeneration of hydrogen peroxide in aqueous TiO₂ dispersions

Photogeneration of hydrogen peroxide in aqueous TiO₂ dispersions

(Photo)electrochemical Methods for the Determination of the Band Edge Positions of TiO₂‐Based Nanomaterials