Hydrothermal synthesis of Ti oxide nanostructures and TiO2:SnO2 heterostructures applied to the photodegradation of rhodamine B

Mourão, Henrique A.J.L.; Avansi, Waldir; Ribeiro, Cauê

doi:10.1016/j.matchemphys.2012.05.019

Cited by 36 publications

(18 citation statements)

References 25 publications

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“…3,4 A heterojunção pode ser definida como a interface entre quaisquer dois materiais no estado sólido, incluindo estruturas cristalinas e amorfas de materiais semicondutores, condutores e isolantes. [5][6][7] O comportamento de uma heteroestrutura de semicondutores depende do band gap, da afinidade eletrônica e das posições relativas das BC e BV dos semicondutores constituintes.…”

Section: Introductionunclassified

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Bueno¹,

Lopes²,

Carvalho³

et al. 2019

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The study of the heterostructures aim the development of physico-chemical and photocatalytic properties higher than their isolated phases, which makes it possible to obtain higher efficiency and lower cost in several technological processes. Recently the heterostructured materials have been extensively used in the development of alternative technologies either for environmental pollution control or for renewable energy production, among other applications. However, the obtaining of a heterostructure with suitable features is not trivial. In this way, this review article presents a broad discussion about methods of obtaining heterostructures formed by semiconductors and their applications in the photochemical processes, mainly in the environmental field. It will be addressed the use of the heterostructures in photocatalytic application for the organic pollutants degradation, heavy metals removal, the inactivation of pathogenic microorganisms, beyond of the volatile organic compounds (VOC's) photooxidation and the photocatalytic abatement of nitrogen oxide (NO x) in gaseous phase. Finally, a discussion about the carbon dioxide (CO 2) photoreduction and hydrogen (H 2) production focusing mainly in the chemical energy production will be presented.

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Section: Introductionunclassified

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Bueno¹,

Lopes²,

Carvalho³

et al. 2019

Self Cite

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“…The formation of heterostructures between semiconductors has been widely studied for applications in heterogeneous photocatalysis, such as organic pollutant degradation, − water splitting, − and artificial photosynthesis. − This topic is of great interest in physical chemistry because it involves the potential to solve several problems related to water treatment and renewable energy, and the complete understanding of the charge transfer mechanism in heterostructures is required. A special feature of a suitable heterostructure is its capacity to increase the lifetime of a photogenerated electron/hole pair by suppressing its recombination. − As a result, the charges instead migrate to the semiconductor surface and increase the occurrence of redox reactions on the heterostructure surface. − In addition, the system formed between the BiVO 4 (type n) , and Bi 2 O 3 (type p) semiconductors , exhibits promising electronic properties for the creation of type-II heterostructures (with p–n junctions). , Due to its band gap characteristics, this heterostructure can be activated by visible radiation, which is an important feature for photocatalytic applications under natural sunlight. ,, …”

Section: Introductionmentioning

confidence: 99%

Growth of BiVO₄ Nanoparticles on a Bi₂O₃ Surface: Effect of Heterojunction Formation on Visible Irradiation-Driven Catalytic Performance

et al. 2017

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Heterostructured materials composed of different semiconductors can be used to decrease rapid charge carrier recombination in photocatalysts, but the development of efficient synthesis methods for these materials remains a challenge. This work describes a novel strategy for tailoring heterostructures that is based on the solubility difference between two semiconductors with at least one metal in common. The growth of BiVO 4 on a preformed Bi 2 O 3 particle was used as a model for heterojunction formation. The number of Bi 2 O 3 /BiVO 4 heterojunctions was tuned using synthesis variables (temperature and V concentration) and the particle size of the preformed Bi 2 O 3. The synthesis of the Bi 2 O 3 /BiVO 4 heterostructures using Bi 2 O 3 nanoparticles resulted in a larger quantity of heterojunctions due to the higher solubility of the nanoparticles compared to micrometric Bi 2 O 3 , which led to a classical heterogeneous precipitation on the preformed surfaces. The proposed growth mechanism was effective for obtaining heterostructured Bi 2 O 3 /BiVO 4 semiconductors with enhanced photocatalytic performances compared to the isolated phases. The greater photoactivity of the heterostructures could be explained by the increased spatial separation in the photogenerated electron/hole pairs due to the formation of a type-II heterostructure and was observed by time-resolved photoluminescence analysis. In this case, the photogenerated electrons were transferred from the conduction band of the p-type semiconductor (Bi 2 O 3) to the n-type (BiVO 4) semiconductor, while the photogenerated holes were transferred from the valence band of the ntype semiconductor to the p-type semiconductor.

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“…Technological and scientific importance of lowtemperature techniques 6 7 is obvious in gas sensing and photocatalytic applications of metal oxide nanosystems. 8 SnO 2 and TiO 2 are n-type metal oxide semiconductors which gas sensing mechenasim belongs to the surfacecontrolled type. The widely used model for gas sensing process is described as follows: In a certain temperature range, chemisorbed oxygen involves the trapping of electrons from the semiconductor forms a depletion layer and band bending on the surface of material, which results in decreasing conductivity of the n-type semiconductor.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, Characterization, and Gas-Sensing Properties of Mesoporous Nanocrystalline SnxTi1-xO2

Zhong¹,

Lin²,

Guo³

2015

j nanosci nanotechnol

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A nanocomposite mesoporous material composed by SnO2 and TiO2 with the size of -5-9 nm were prepared via a facile wet-chemical approach combining with an annealing process. The microstructure of obtained Sn(x)Ti(1-x)O2 powders were characterized by X-ray diffraction, X-ray Photo-electronic Spectroscopy, scanning electron microscope, transmission electron microscope and nitrogen adsorption-desorption experiment. The gas sensing performances to several gases of the mesoporous material were studied. The sensors of Sn(x)Ti(1-x)O2 (ST10, with 9.1% Ti) exhibited very high responses to volatile organic compounds at 160 degrees C. The order of the responses to volatile gases based on ST10 was ethanol > formaldehyde > acetone > toluene > benzene > methane. Sensor based on ST10 displays a highest sensitivity to hydrogen at 200 degrees C. Sensor responses to H2 at 200 degrees C have been measured and analyzed in a wide concentration range from 5 to 2000 ppm. The solid solution Sn(x)Ti(1-x)O2 can be served as a potential gas-sensing material for a broad range of future sensor applications.

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Hydrothermal synthesis of Ti oxide nanostructures and TiO2:SnO2 heterostructures applied to the photodegradation of rhodamine B

Cited by 36 publications

References 25 publications

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Growth of BiVO₄ Nanoparticles on a Bi₂O₃ Surface: Effect of Heterojunction Formation on Visible Irradiation-Driven Catalytic Performance

Synthesis, Characterization, and Gas-Sensing Properties of Mesoporous Nanocrystalline Sn<SUB><I>x</I></SUB>Ti<SUB>1-<I>x</I></SUB>O<SUB>2</SUB>

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Hydrothermal synthesis of Ti oxide nanostructures and TiO2:SnO2 heterostructures applied to the photodegradation of rhodamine B

Cited by 36 publications

References 25 publications

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Semicondutores Heteroestruturados: Uma Abordagem Sobre Os Principais Desafios Para a Obtenção E Aplicação Em Processos Fotoquímicos Ambientais E Energéticos

Growth of BiVO4 Nanoparticles on a Bi2O3 Surface: Effect of Heterojunction Formation on Visible Irradiation-Driven Catalytic Performance

Synthesis, Characterization, and Gas-Sensing Properties of Mesoporous Nanocrystalline Sn<SUB><I>x</I></SUB>Ti<SUB>1-<I>x</I></SUB>O<SUB>2</SUB>

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Growth of BiVO₄ Nanoparticles on a Bi₂O₃ Surface: Effect of Heterojunction Formation on Visible Irradiation-Driven Catalytic Performance