Photocatalytic activity of undoped and sulfur-doped TiO2 films grown by MOCVD for water treatment under visible light

Bento, Rodrigo T.; Corrêa, Olandir Vercíno; Pillis, Marina F.

doi:10.1016/j.jeurceramsoc.2019.02.046

Cited by 39 publications

(34 citation statements)

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“…Besides the structural, physical-chemical and morphological characteristics of the catalyst, the photocatalytic behavior of the TiO 2 films is also influenced by several experimental parameters, which include the pH of the reaction medium, the initial concentration and type of pollutant, the amount of photocatalyst, the specific surface area of the catalyst, the reactor design, the reaction temperature, the luminous intensity of the radiation source, and the irradiation time. 4,6,18,19 It is essential to know these parameters to define the best operating conditions for the use of TiO 2 films in environmental applications. Recent researches have reported the significance of these operational parameters.…”

Section: Effect Of Growth Parameters On the Photocatalytic Performancmentioning

confidence: 99%

“…At 400 °C the growth time varied between 15 and 60 min, and for 500 °C it ranged from 11 to 60 min. The optimized process parameters based on previous work 13,19 carried out by the research group are given in Table 1. For the synthesis of the films, only titanium(IV) isopropoxide (TTiP) (purity 99.999%, Sigma-Aldrich Co., St. Louis, USA) was used as the titanium and oxygen sources.…”

Section: Growth Of Tio 2 Filmsmentioning

confidence: 99%

“…The degree of dye photodegradation (X) is given by Beer-Lambert law (equation 1), where C 0 is the initial dye concentration, and C is the dye concentration at different irradiation times. 4,19 (1)…”

Section: Evaluation Of Tio 2 Heterogeneous Photocatalytic Performancementioning

confidence: 99%

“…The photocatalytic behavior of a semiconductor can vary with the different morphological characteristics and impurities present on the catalyst surface. 18,19 A high specific surface area may favor a greater formation of hydroxyl radicals (HO • ), which results in the increase of the photocatalytic efficiency and regeneration time of the catalyst. 6 The surface area of TiO 2 films is related to the grain size.…”

Section: Morphology and Cross-section Analysesmentioning

confidence: 99%

“…The results revealed that in the growth of TiO 2 films at 400 and 500 °C the films thickness increases linearly with the deposition time, demonstrating a constant growth rate, which allows a good reproducibility of the deposition process. 2,4,19 Table 2 exhibits the morphological characteristics of the TiO 2 films grown at 400 and 500 °C.…”

Section: Morphology and Cross-section Analysesmentioning

confidence: 99%

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Effect of Growth Parameters on the Photocatalytic Performance of TiO2 Films Prepared by MOCVD

Marcello¹,

Corrêa²,

Bento³

et al. 2020

J. Braz. Chem. Soc.

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The present study evaluated the main factors that influence the photocatalytic activity of titanium dioxide (TiO 2 ) films grown by metalorganic chemical vapor deposition (MOCVD) at 400 and 500 °C, in different growth times. The photocatalytic behavior was analyzed by measuring the methyl orange dye degradation at different pH values. Structural and morphological characteristics, and the recyclability of the catalysts for several cycles were also investigated. Anatase phase was identified in all films. The higher photodegradation performances were obtained at acidic pH. The results demonstrated that the photocatalyst thickness is an important parameter in heterogenous photocatalysis. The best photocatalytic result occurred for the 395 nm-thick TiO 2 film grown at 400 °C, which presented 65.3% of the dye degradation under UV light. The recyclability experiments demonstrated that the TiO 2 films grown by MOCVD present a great stability after several photocatalytic cycles, which allows their practical application for water treatment with high efficiency.

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Section: Effect Of Growth Parameters On the Photocatalytic Performancmentioning

confidence: 99%

Section: Growth Of Tio 2 Filmsmentioning

confidence: 99%

Section: Evaluation Of Tio 2 Heterogeneous Photocatalytic Performancementioning

confidence: 99%

Section: Morphology and Cross-section Analysesmentioning

confidence: 99%

Section: Morphology and Cross-section Analysesmentioning

confidence: 99%

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