Recent advances in semiconductor metal oxides with enhanced methods for solar photocatalytic applications

Karthikeyan, C.; Arunachalam, Prabhakarn; Ramachandran, K.; Al‐Mayouf, Abdullah M.; Karuppuchamy, S.

doi:10.1016/j.jallcom.2020.154281

Cited by 380 publications

(128 citation statements)

References 174 publications

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“…Third, the characteristics of non-toxic, stable, low cost, and recyclable further promote development [4]. The core of photocatalytic technology is the photocatalyst, and many materials can act as a photocatalyst [5]. Table 1 shows the published data of different photocatalysts, including TiO 2 [6][7][8], SrTiO 3 [9][10][11], ZnO [12][13][14], WO 3 [15][16][17], ZrO 2 [18][19][20], and g-C 3 N 4 [21][22][23], and their performance.…”

Section: Introductionmentioning

confidence: 99%

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Zhou

2020

Catalysts

152

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A high-efficiency method to deal with pollutants must be found because environmental problems are becoming more serious. Photocatalytic oxidation technology as the environmentally-friendly treatment method can completely oxidate organic pollutants into pollution-free small-molecule inorganic substances without causing secondary pollution. As a widely used photocatalyst, titanium dioxide (TiO2) can greatly improve the degradation efficiency of pollutants, but several problems are noted in its practical application. TiO2 modified by different materials has received extensive attention in the field of photocatalysis because of its excellent physical and chemical properties compared with pure TiO2. In this review, we discuss the use of different materials for TiO2 modification, highlighting recent developments in the synthesis and application of TiO2 composites using different materials. Materials discussed in the article can be divided into nonmetallic and metallic. Mechanisms of how to improve catalytic performance of TiO2 after modification are discussed, and the future development of modified TiO2 is prospected.

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Section: Introductionmentioning

confidence: 99%

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Zhou

2020

Catalysts

152

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“…Heterogenous metal oxide semiconductors are the most suitable for photocatalytic treatment to degrade the pollutants in air and water. [ 8 ] Many semiconductor oxides are having good photocatalytic activity, especially TiO 2 , ZnO, SnO 2 , etc., [ 9 ] in UV radiation, but there are some limitations because 4–5% UV radiation from the solar radiation reach on earth and major part of radiation are found in the visible region. [ 10,11 ] Simultaneously, other restriction is faced in case of single semiconductors such as TiO 2 or ZnO due to low ability of adsorption, fast recombination, and easy agglomeration of particles, [ 12 ] which remarkably prevent the performance of advanced oxidation process and industrial applications of pure TiO 2 or ZnO.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneous Ternary Metal Oxide Nanocomposites for Improved Advanced Oxidation Process under Visible Light

Upadhyay

Pathak

2020

Crystal Research and Technology

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Here, heterogeneous ternary metal oxide CdO:TiO 2 :ZnO (coded as CTZ0, CTZ1, CTZ2, CTZ3, CTZ4) nanocomposites are synthesized by a sol-gel precipitation method for the advanced oxidation process (AOP) under visible light. The structure, texture, and surface morphology of heterogeneous nanocomposites are identified by X-ray diffraction, high-resolution transmission electron microscopy, and field emission scanning electron microscopy, respectively, while the optical property is investigated by UV-vis spectrophotometry. Furthermore, mixed phases such as anatase and rutile TiO 2 , cubic CdO and hexagonal ZnO, as well as a mixture of morphology, viz., nanorod, nanoflakes, cluster, and aggregation of particles are observed concurrently for sample CTZ3. The reflectance of heterogeneous CdO:TiO 2 :ZnO nanocomposites is recorded in the visible wavelength range from 400 to 800 nm and optical bandgap is varied from 1.91 to 2.20 eV for samples CTZ1-CTZ4. The effect of weight load 5 g L −1 of heterogeneous nanocomposites is evaluated for degradation of organic dyes at neutral pH and obtains the highest efficiency for sample CTZ3 as 99.6% and 99.4% in methyl orange and methylene blue, respectively. Both biological oxygen demand and chemical oxygen demand values are reduced followed by AOP increasing the number of pollutant molecules for absorption in the mixture.

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“…10%) due to their large band gap and rapid recombination of photoexcited electrons and holes. 23 Spontaneous polarization in a ferroelectric material can induce the internal depolarization field, which is beneficial to drive the separation of photoexcited charge carriers effectively. 24 Furthermore, as bismuth-containing compounds, BLSFs show superior photocatalytic activity, which can be attributed to: (a) The formation of a hybridized valence band comprising of Bi 6s and O 2p states pushes up the absorption band edge, and thus leads to a reduction in the band gap; (b) The dispersed nature of hybridized valence bands enhances the mobility of the photoexcited holes, and thus facilitates the photodegradation process.…”

Section: Introductionmentioning

confidence: 99%

“…The photocatalysis efficiency of traditional semiconductor oxides (TiO 2 , ZnO, etc ) and sulphides (ZnS and CdS) is very low (ca. 10%) due to their large band gap and rapid recombination of photoexcited electrons and holes 23 . Spontaneous polarization in a ferroelectric material can induce the internal depolarization field, which is beneficial to drive the separation of photoexcited charge carriers effectively 24 .…”

Section: Introductionmentioning

confidence: 99%

Ferroelectric and photocatalytic properties of Aurivillius phase Ca₂Bi₄Ti₅O₁₈

Wang

Zhang

et al. 2020

J. Am. Ceram. Soc.

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Aurivillius phase Ca 2 Bi 4 Ti 5 O 18 powders with micrometer size were produced by solid-state reaction. X-ray diffraction revealed that the powders had polar orthorhombic structure with space group of B2cb. Ca 2 Bi 4 Ti 5 O 18 ceramic exhibited frequency independent dielectric anomaly at 774°C. The piezoelectric coefficient d 33 value of poled Ca 2 Bi 4 Ti 5 O 18 pellets was 0.7 ± 0.2 pC/N. Both frequency independent dielectric anomaly and detectable d 33 value clearly indicated that Ca 2 Bi 4 Ti 5 O 18 is a ferroelectric material with Curie point of 774 ℃. UV-vis absorption spectra revealed that Ca 2 Bi 4 Ti 5 O 18 had a direct band gap of 3.2 eV. Photocatalytic activity of the Ca 2 Bi 4 Ti 5 O 18 powders was examined by degradation of rhodamine B (RhB) under simulated solar light. 16% of RhB solution was degraded by Ca 2 Bi 4 Ti 5 O 18 powders after 4 hours UV-vis irradiation. With Ag nanoparticles deposited on the Ca 2 Bi 4 Ti 5 O 18 powders surface, 50% of RhB was degraded under the same irradiation condition. The fitted degradation rate constant of Ag decorated Ca 2 Bi 4 Ti 5 O 18 was 4 times higher than that of bare Ca 2 Bi 4 Ti 5 O 18. This work suggested that the Aurivillius ferroelectric Ca 2 Bi 4 Ti 5 O 18 is a promising candidate for photocatalytic applications.

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Recent advances in semiconductor metal oxides with enhanced methods for solar photocatalytic applications

Cited by 380 publications

References 174 publications

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Heterogeneous Ternary Metal Oxide Nanocomposites for Improved Advanced Oxidation Process under Visible Light

Ferroelectric and photocatalytic properties of Aurivillius phase Ca₂Bi₄Ti₅O₁₈

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Recent advances in semiconductor metal oxides with enhanced methods for solar photocatalytic applications

Cited by 380 publications

References 174 publications

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Impact of Titanium Dioxide (TiO2) Modification on Its Application to Pollution Treatment—A Review

Heterogeneous Ternary Metal Oxide Nanocomposites for Improved Advanced Oxidation Process under Visible Light

Ferroelectric and photocatalytic properties of Aurivillius phase Ca2Bi4Ti5O18

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Ferroelectric and photocatalytic properties of Aurivillius phase Ca₂Bi₄Ti₅O₁₈