Heterostructure of epitaxial (001) Bi4Ti3O12 growth on (001) TiO2 for enhancing photocatalytic activity

Zhang, Jun; Huang, Lihai; Liu, Pengliang; Wang, Yan; Jiang, Xudong; Zhang, Erpan; Wang, Hongbo; Kong, Zhe; Xi, Junhua; Ji, Zhenguo

doi:10.1016/j.jallcom.2015.09.067

Cited by 40 publications

(10 citation statements)

References 43 publications

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“…In this work, it has been demonstrated that it is indeed possible to grow BTO from this facet when using our SILAR BiOBr/thermal annealing route. In addition, the crystallinity of the BTO material formed in this route is significantly higher than that demonstrated by Zhang et al, 23 a factor which has been demonstrated to be very significant in photocatalysis.…”

Section: X-ray Diffractionmentioning

confidence: 62%

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Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi₄Ti₃O₁₂ on TiO₂: an enhanced and stable photocatalytic system for water purification

Odling

Chatzisymeon

Robertson

2018

Catal. Sci. Technol.

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A new method to produce bismuth titanate -titanium dioxide composites by modification of a TiO 2 film deposited on a variety of different glass substrates is reported. Using a simple SILAR method, BiOBr may be deposited upon TiO 2 surfaces, which upon heating forms a closely intercalated structure of bismuth titanate (Bi 4 Ti 3 O 12 , BTO) and TiO 2 . This new method expands the scope of the SILAR process, which is typically restricted to materials which can be formed from soluble precursors. This composite material has undergone a thorough materials characterisation to confirm the absence of the BiOBr precursor, and the formation of the new bismuth titanate phase. The electronic structure of the heterojunction formed has also been investigated by valence band XPS and diffuse reflectance measurements, and a plausible band structure proposed. The immobilised composites have then been applied to the photocatalytic degradation of organic pollutants and bactericidal testing, as well as stability tests and identification of the key reactive species. Further photocatalytic studies have been carried out on this material in a synthetic wastewater medium, taking a step towards application under real-world conditions. IntroductionThe availability of clean water has been identified as one of the United Nations' global goals for sustainable development. 1 The provision of this basic resource for a rapidly growing global population poses significant challenges, namely the extreme low cost and lack of extensive infrastructure required to be viable in the developing world. Semiconductor photocatalysis has the potential to fit this niche well, particularly when operated using freely available sunlight. Indeed, it is often the regions of the globe worst affected by poor water quality that have reliable sunshine over much of the year. 2Through the generation of reactive species, semiconductor photocatalysis has been proven to be effective in the destruction of organic pollutants 3 and bacteria. 4,5 For this purpose, titanium dioxide (TiO 2 ) is a material which is subject to considerable attention 6,7 due to the high natural abundance of its constituent elements in the earth's crust, 8 low cost 9 and low toxicity. 10 However, due to the wide band gap of 3-3.2 eV, the use of TiO 2 under solar irradiation is limited to the UV portion of the spectrum (∼5%). In addition, recombination of photo-generated charges has been found to be orders of magnitude faster than surface reactions, 11,12 causing most of the photo-excited holes and electrons to recombine before being able to generate any useful species. One method by which TiO 2 can be given both visible light activity and a mechanism to allow charges to separate is to form a heterojunction with another, narrower band gap semiconductor. 13 The narrower band gap allows excitation by visible light, and the interface between the two materials allows charges to be separated in space and therefore recombination is hindered. method to prepare a titanate semiconductor due to the insolubilit...

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Section: X-ray Diffractionmentioning

confidence: 62%

“…23 It was concluded that this was due to an inability for BTO to form on the anatase [101] facet under hydrothermal conditions. Using the SILAR/thermal annealing route described here however it appears that it is possible for BTO for form on this facet, and give good photocatalytic activity.…”

Section: View Article Onlinementioning

confidence: 99%

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi₄Ti₃O₁₂ on TiO₂: an enhanced and stable photocatalytic system for water purification

Odling

Chatzisymeon

Robertson

2018

Catal. Sci. Technol.

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“…Figure 4 shows the UV-Vis absorption spectra of the composites BT1 and BT2, as well as pure phase TiO 2 submicron fibers and the Bi 2 Ti 2 O 7 hydrothermal product, which were converted from the corresponding diffusion reflectance spectra using the Kubelka-Munk function [27]. Pure anatase TiO 2 submicron fibers only showed fundamental absorption in the UV-light region, while Bi 2 Ti 2 O 7 displayed a portion of absorption in visible-light region.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, it can serve as both reactant and substrate, ensuring close contact between Bi 2 Ti 2 O 7 nanostructures and TiO 2 submicron fibers for uniform growth of a hierarchical configuration. The hydrothermal process was performed in an alkaline environment where an aqueous solution of Bi(NO 3 ) 3 and submicron TiO 2 fibers were used as reactants [25–27]. The characterization results indicated that Bi 2 Ti 2 O 7 nanosheets with high crystallinity grew successfully on TiO 2 submicron fibers and well-defined three-dimensional hierarchical heterostructures of Bi 2 Ti 2 O 7 /TiO 2 submicron fibers were formed.…”

Section: Introductionmentioning

confidence: 99%

In Situ Fabrication of Bi2Ti2O7/TiO2 Heterostructure Submicron Fibers for Enhanced Photocatalytic Activity

Zhou

et al. 2016

Nanoscale Res Lett

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A facile two-step synthesis route combining electrospinning and hydrothermal techniques has been performed to obtain Bi2Ti2O7/TiO2 heterostructured submicron fibers. Bi2Ti2O7 nanosheets were grown on the surface of TiO2 submicron fibers. The density of the nanosheets increased with higher precursor concentration of the Bi/Ti reaction raw materials. UV-visible (UV-vis) diffuse reflectance spectroscopy indicated that the absorption spectrum of the Bi2Ti2O7/TiO2 composite extended into the visible-light region. Photocatalytic tests showed that the Bi2Ti2O7/TiO2 heterostructures possess a much higher degradation rate of rhodamine B than the unmodified TiO2 submicron fibers under visible light. The enhanced photocatalytic activity can be attributed to the synergistic effect between improved visible-light absorption and the internal electric field created by the heterojunctions. The effective separation of photogenerated carriers driven by the photoinduced potential was demonstrated by the photoelectrochemical analysis.Electronic supplementary materialThe online version of this article (doi:10.1186/s11671-016-1408-7) contains supplementary material, which is available to authorized users.

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“…Among them, bismuth titanates have demonstrated promising optoelectronic properties 3 , such as ferroelectricity, photoconductivity and piezoelectricity 1,[4][5][6] . These characteristics make them an alternative to lead-containing materials, being useful for several devices including optical displays, capacitors, catalysts, sensors and transducers, among other applications [7][8][9][10][11][12][13][14][15] . The Bi 4 Ti 3 O 12 compound belongs to the Aurivillius family 5,9,16,17 and it has been studied due to its promising piezoelectric and dielectric properties 1 .…”

Section: Introductionmentioning

confidence: 99%

Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

et al. 2018

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This paper aims to evaluate the synthesis and annealing parameters for production of nanometric Bi 4 Ti 3 O 12 and its properties. The powders were obtained through the solution combustion route and the impacts of annealing temperature on the materials' physicochemical features as well as their optical and electrical properties were investigated. Thus, the prepared powders were annealed at 600ºC, 700ºC and 800ºC and then characterized by several techniques. The results demonstrated that the combustion method was effective for production of nanocrystalline powders with high levels of purity. A trend for particle and crystallite growth was observed as the calcination temperature increased. X-Ray, HRTEM and Raman spectroscopy confirmed the crystalline nature of the powders, whereas impedance spectroscopy demonstrated a reduction of electrical resistance according to the calcination temperature applied. Optical properties were not highly influenced by annealing. The temperature of 600ºC was appropriate to produce crystalline particles with desirable low sizes for application.

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Heterostructure of epitaxial (001) Bi4Ti3O12 growth on (001) TiO2 for enhancing photocatalytic activity

Cited by 40 publications

References 43 publications

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi₄Ti₃O₁₂ on TiO₂: an enhanced and stable photocatalytic system for water purification

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi₄Ti₃O₁₂ on TiO₂: an enhanced and stable photocatalytic system for water purification

In Situ Fabrication of Bi2Ti2O7/TiO2 Heterostructure Submicron Fibers for Enhanced Photocatalytic Activity

Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

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Heterostructure of epitaxial (001) Bi4Ti3O12 growth on (001) TiO2 for enhancing photocatalytic activity

Cited by 40 publications

References 43 publications

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi4Ti3O12 on TiO2: an enhanced and stable photocatalytic system for water purification

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi4Ti3O12 on TiO2: an enhanced and stable photocatalytic system for water purification

In Situ Fabrication of Bi2Ti2O7/TiO2 Heterostructure Submicron Fibers for Enhanced Photocatalytic Activity

Production of Nanometric Bi4Ti3O 12 Powders: from Synthesis to Optical and Dielectric Properties

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Product

Resources

About

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi₄Ti₃O₁₂ on TiO₂: an enhanced and stable photocatalytic system for water purification

Sequential ionic layer adsorption and reaction (SILAR) deposition of Bi₄Ti₃O₁₂ on TiO₂: an enhanced and stable photocatalytic system for water purification