Photocatalytic activity and reusability study of nanocrystalline TiO2 films prepared by sputtering technique

Barrocas, B.; Monteiro, Olinda C.; Jorge, M. E. Melo; Sério, Susana

doi:10.1016/j.apsusc.2012.09.136

Cited by 51 publications

(37 citation statements)

References 23 publications

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“…For example, the anatase phase (E BG = 3.2 eV) of titania has been widely reported to be superior with regards to photocatalytic performance, compared to the rutile phase even though rutile phase (E BG = 3.0 eV) possesses a smaller band gap. However, fewer studies have correlated the photocatalytic performance of TiO 2 films to their mixed anatase/rutile content [97,98]. Between these forms, variation of anatase-to-rutile content of TiO 2 can be achieved either by using different TiO 2 preparation methods or by sintering/calcination prepared TiO 2 at elevated temperatures for a variable time.…”

Section: Page 6 Of 70mentioning

confidence: 97%

Nanoscale TiO2 films and their application in remediation of organic pollutants

Varshney

Kanel

Kempisty

et al. 2016

Coordination Chemistry Reviews

139

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Section: Page 6 Of 70mentioning

confidence: 97%

Nanoscale TiO2 films and their application in remediation of organic pollutants

Varshney

Kanel

Kempisty

et al. 2016

Coordination Chemistry Reviews

139

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“…[8][9][10][11] However, TiO 2 has a major drawback in processes associated with solar photocatalysis due to its wide bandgap (3.2 eV), making it difficult to implement an overall technological process based on TiO 2 . The high recombination rate of photo-charge carriers is also a handicap for this semiconductor large scale application.…”

Section: Introductionmentioning

confidence: 99%

The effect of ionic Co presence on the structural, optical and photocatalytic properties of modified cobalt–titanate nanotubes

Barrocas

Silvestre

Rolo

et al. 2016

Phys. Chem. Chem. Phys.

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With the aim of producing materials with enhanced optical and photocatalytic properties, titanate nanotubes (TNTs) modified by cobalt doping (Co-TNT) and by Na(+)→ Co ion-exchange (TNT/Co) were successfully prepared by a hydrothermal method. The influence of the doping level and of the cobalt position in the TNT crystalline structure was studied. Although no perceptible influence of the cobalt ion position on the morphology of the prepared titanate nanotubes was observed, the optical behaviour of the cobalt modified samples is clearly dependent on the cobalt ions either substituting the Ti(4+) ions in the TiO6 octahedra building blocks of the TNT structure (doped samples) or replacing the Na(+) ions between the TiO6 interlayers (ion-exchange samples). The catalytic ability of these materials on pollutant photodegradation was investigated. First, the evaluation of hydroxyl radical formation using the terephthalic acid as a probe was performed. Afterwards, phenol, naphthol yellow S and brilliant green were used as model pollutants. Anticipating real world situations, photocatalytic experiments were performed using solutions combining these pollutants. The results show that the Co modified TNT materials (Co-TNT and TNT/Co) are good catalysts, the photocatalytic performance being dependent on the Co/Ti ratio and on the structural metal location. The Co(1%)-TNT doped sample was the best photocatalyst for all the degradation processes studied.

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“…It is pointed out by other researchers that the optimal photocatalytic performances are reached in a TiO 2 film with a mixed phase, in which anatase phase is predominant. [30] Thus a suitable amount of rutile TiO 2 is incorporated into the top TiO 2 (A) layer to improve the photocatalytic and photoinduced hydrophilic properties. In addition, to measure the multilayer film for application in smart window, we used a large-size MS apparatus with medium frequency pulsed power to deposit large-scale TiO 2 (R)/VO 2 (M)/ TiO 2 (A) multilayer film.…”

Section: Introductionmentioning

confidence: 99%