A review on the synthesis of the various types of anatase TiO2 facets and their applications for photocatalysis

The growth of industrialization, which is forced to use non-renewable energy sources, leads to an increase in environmental pollution. Therefore, it is necessary not only to reduce the use of fossil fuels to meet energy needs but also to replace it with cleaner fuels. Production of hydrogen by splitting water is considered one of the most promising ways to use solar energy. TiO2 is an amphoteric oxide that occurs naturally in several modifications. This review summarizes recent advances of doped TiO2-based photocatalysts used in hydrogen production and the degradation of organic pollutants in water. An intense scientific and practical interest in these processes is aroused by the fact that they aim to solve global problems of energy conservation and ecology.

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“…This transition of the electron leads to the generation of a positively charged carrier-hole (

) in the valence band (Equation (1)). Also, these charge carriers can recombine among themselves (Equation (2)) [ 4 , 5 ].

…”

Section: Introductionmentioning

confidence: 99%

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

et al. 2020

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“…The charge carriers trapped by TiO2 surface are extremely reactive. Almost any organic compounds can be photooxidized on TiO2 surface to CO2 and H2O [2,[5][6][7][8]. Viruses and bacteria can be destroyed over the photocatalytic surface as well [9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Optimal H2O2 concentration in advanced oxidation over titanium dioxide photocatalyst

Danyliuk

Mironyuk

Tatarchuk

et al. 2021

Phys. Chem. Solid St.

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The oxidative degradation of Rhodamine B dye under ultraviolet irradiation was studied. The degradation rate was measured with using of smartphone camera. Photocatalytic degradation of the Rhodamine B dye over the P25-TiO2 catalyst has been found to accelerate substantially in the presence of hydrogen peroxide. The relationship between the photocatalytic degradation rate and H2O2 concentration has been studied. The optimal concentration of H2O2 has been found to in the range of 10-25 mM. The proposed mixture of P25 photocatalyst and H2O2 oxidizer can be used to remove organic pollutions from industrial waste water.

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“…This effect indicates the transformation from anatase to rutile and is perceived at all other angles in the scanning range. In general, the effect of raising the temperature in the treatment can influence the formation of the rutile phase (48,49). It can also be noted that the peaks formed from the rutile phase have good definition and thinner thickness, indicating high crystallinity (50).…”

Section: Xrd Analysismentioning

confidence: 99%

“…Studies show the excitation mechanisms promoted under the surface of anatase and rutile crystalline phases for the promotion of OH radicals in water, presenting advantages and limitations (35). TiO 2 Evonik ® P25, for example, has anatase: rutile phase composition in the proportion of 70:30 and is often cited for exhibiting noticeably higher photocatalytic activity compared to pure phase TiO 2 samples (48,58).…”

Section: Xrd Analysismentioning

confidence: 99%

“…Previous work has reported an increase in average crystal size and a reduction in the anatase phase with higher calcination temperatures (59,60). Several factors such as surface area, average crystal size, the proportion of polymorphs, types of dopants, the concentration of defects, synthesis methods and phase purity strongly affect the photocatalytic activity of TiO 2 (48,(61)(62)(63)(64)(65). The estimated values were obtained from the first derivative of the absorbance values as a function of the scanning wavelength.…”

Section: Xrd Analysismentioning

confidence: 99%

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TiO₂ Synthesis by the Pechini’s Method and Application for Diclofenac Photodegradation^†

Souza

Neves

França

et al. 2020

Photochem & Photobiology

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In this work, the effect of the calcination temperature on the TiO2 synthesis using Pechini’s method was reported. The adopted calcination temperatures were 500, 600, and 700°C. XRD measurements indicated the composition of crystalline phases, and from there, the conversion of the anatase phase to rutile. TiO2 Evonik® was used as a reference standard and sodium diclofenac as a standard for photodegradation assessment. The average crystalline size increased. In both cases, this trend accompanied the increase in calcination temperature. The optical properties were performed using diffuse UV‐Vis reflectance. Results obtained indicated maximum absorption wavelength values more intense and displaced to the visible region. Also, the estimated band gap energy values decreased. The photocatalytic performance of TiO2 samples was superior to the reference catalyst (TiO2 Evonik®). Especially in the first 10 minutes, the comparative photodegradation was up to approximately 58% higher. The photodegradation kinetic constants were also higher, and by comparison, up to approximately 73% higher. Toxicity measurements, using Artemias salina, also indicated similar decay behavior in the first 10 minutes, with a performance of up to approximately 60%.

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A review on the synthesis of the various types of anatase TiO2 facets and their applications for photocatalysis

Cited by 252 publications

References 221 publications

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Optimal H2O2 concentration in advanced oxidation over titanium dioxide photocatalyst

TiO₂ Synthesis by the Pechini’s Method and Application for Diclofenac Photodegradation^†

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A review on the synthesis of the various types of anatase TiO2 facets and their applications for photocatalysis

Cited by 252 publications

References 221 publications

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Recent Developments of TiO2-Based Photocatalysis in the Hydrogen Evolution and Photodegradation: A Review

Optimal H2O2 concentration in advanced oxidation over titanium dioxide photocatalyst

TiO2 Synthesis by the Pechini’s Method and Application for Diclofenac Photodegradation†

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Product

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TiO₂ Synthesis by the Pechini’s Method and Application for Diclofenac Photodegradation^†