Construction of novel TiO2/Bi4Ti3O12/MoS2 core/shell nanofibers for enhanced visible light photocatalysis

Chang, Meng-Jie; Cui, Wen-Na; Li, Jun; Wang, Kang; Du, Huiling; Qiu, Lei; Fan, Si-Meng; Luo, Zhenmin

doi:10.1016/j.jmst.2019.06.020

Cited by 46 publications

(9 citation statements)

References 32 publications

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“…For BHYTO: 0.05Li phosphors, the peaks of Bi S 4f shifted close to Bi C 4f peaks and the area surrounded by Bi S 4f curve and based line became smaller, which suggests Li + doping had an effect on stabilizing oxygen in crystal lattice to make the environment around Bi 3+ ions near the surface more similar to that in the body. As shown in Figure 4c, the peaks of 457.6 eV and 463.3 eV correspond to the characteristic binding energy of Ti 2p 3/2 and Ti 2p 1/2 [30], and the peak of Ti 2p 1/2 overlaps with Bi 4d 1/2 to form a wide energy peak. Note that nearly no change for the Ti 2p spectra indicates that Li + did not substitute Ti 4+ for the perovskite layer in BTO host.…”

Section: Resultsmentioning

confidence: 94%

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

et al. 2021

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A series of novel Li+ doped Bi3.46Ho0.04Yb0.5Ti3O12 (BHYTO: xLi, 0 ≤ x ≤ 0.15) upconversion phosphors were prepared through a sol-gel-sintering method. There exist three emission bands centered at 545 nm, 658 nm, and 756 nm in the upconversion emission spectra at 980 nm excitation, corresponding to energy transitions of 5F4/5S2 → 5I8, 5F5 → 5I8 and 5F4/5S2 → 5I7 of Ho3+, and the upconversion emission intensity of BHYTO: 0.05Li is about 2.2 times stronger than that of BHYTO samples. The luminescent lifetime of the strongest emission (545 nm) is in the range of 45.25 to 65.99 μs for the different BHYTO: xLi phosphors. The energy transfers during the upconversion pumping process from Yb3+ to Ho3+ are mainly responsible for all the emissions, each belonging to a double-photon process. Li+ mainly entered into the interspace sites or occupied Bi3+ sites in Bi4Ti3O12 host during the fabrication process according to its dosage, and the possibility is very low for Li+ to take part in the energy transfer process directly due to its lack of matching levels with 4f of Ho3+ and Yb3+. However, Li+ doping can not only increase the size of crystal grains to improve crystallinity through XRD analysis, but also reduced oxygen vacancies to decrease the number of quenching centers through XPS analysis. The improved crystallinity and reduced quenching centers are proposed to be the main causes for the enhanced upconversion luminescence of the Li+ doped BHYTO phosphor.

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Section: Resultsmentioning

confidence: 94%

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

et al. 2021

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“… These multilayer structures demonstrated improved visible-light absorbance and photoinduced charge separation, realized by the large surface area of MoS 2 and quick charge transfer at the semiconductor interface. However, the stability of these materials seems to be a drawback for this structure because the activity decreased to 56% in the third run of the degradation cycle …”

Section: Classifications and Synthesis Methodsmentioning

confidence: 99%

Section: Classifications and Synthesis Methodsmentioning

confidence: 99%

“…65 Additionally, TiO 2 /Bi 4 Ti 3 O 12 /MoS 2 CS nanofibers were constructed by the combination of several synthesis methods, including electrospinning, successive ionic layer adsorption and reaction (SILAR), solid-state reaction, and hydrothermal treatment (Figure 2). 66 These multilayer structures demonstrated improved visible-light absorbance and photoinduced charge separation, realized by the large surface area of MoS 2 and quick charge transfer at the semiconductor interface. However, the stability of these materials seems to be a drawback for this structure because the activity decreased to 56% in the third run of the degradation cycle.…”

Section: Classifications and Synthesis Methodsmentioning

confidence: 99%

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Core–Shell Nanophotocatalysts: Review of Materials and Applications

Shafiee

Rabiee

Ahmadi

et al. 2022

ACS Appl. Nano Mater.

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Hybrid nanostructures and nanoarchitectures possess unique physicochemical properties such as high activity/functionality, enhanced physicochemical stability, and improved biocompatibility, which renders them suitable for various biomedical, pharmaceutical, environmental, and catalytic applications. In this context, core–shell nanophotocatalysts have shown superior activity compared to their counterparts, namely, their individual pristine semiconductors and composite materials components. Thus, the development of various innovative core–shell nanostructures as photocatalysts is of practical relevance in view of their unique properties with salient advantageous features applicable to, among others, the degradation of organic pollutants, energy storage, and H2 generation. Assorted techniques are deployed to synthesize core–shell nanostructures, including chemical vapor deposition, sol–gel, hydrothermal, spin-coating deposition, solvothermal, combustion waves, microwave (MW)- and ultrasonic-assisted, electrodeposition, laser ablation, and biological approaches. Because core–shell nanostructures provide an immense opportunity to have the most efficient photocatalysts with high stability and reproducibility; herein, the recent advances in this domain are discussed, comprising the most important fabrication techniques and diverse appliances including important challenges and unrealized opportunities.

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“…Recently, many strategies have been proposed to improve the photocatalytic activities of TiO 2 and WO 3 photocatalysts. TiO 2 and WO 3 photocatalysts have been modified by coupling with cocatalysts − ,− or combining with other semiconductors ,− to decrease the recombination of charge carriers and extend the light absorption range. For example, Li et al reported that the 1T-WS 2 /TiO 2 /Ti 3 C 2 composite with double metallic co-catalysts exhibited nearly 50 times higher photocatalytic H 2 evolution performance than TiO 2 nanosheets .…”

Section: Introductionmentioning

confidence: 99%

Synergistic Effects of Fluorine and WO₃ Nanoparticles on the Surface of TiO₂ Hollow Spheres for Enhanced Photocatalytic Activity under Visible Light Irradiation

Shin

Lee

et al. 2021

ACS Omega

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TiO 2 is an attractive catalyst for the photocatalytic degradation of organic pollutants. However, owing to its large band gap, it can only be activated by ultraviolet (UV) light, which constitutes a small portion of solar energy. Therefore, there has been significant interest in extending its light absorption range from UV to visible light. In this study, fluorinated TiO 2 hollow spheres (FTHSs) were prepared via a rapid and simple wet chemical process using ammonium hexafluorotitanate, and then FTHS/WO 3 heterostructures with different weight ratios of the FTHS and WO 3 nanoparticles were synthesized via a simple wet impregnation method. The formation of the hybrid structure was confirmed by various characterization techniques. The photocatalytic activity of the synthesized photocatalysts in the photodegradation of rhodamine B, a model pollutant, was evaluated under visible light irradiation. The FTHS/WO 3 heterostructures exhibited significantly improved photocatalytic activity compared to the bare FTHS or WO 3 nanoparticles. The photodegradation efficiency of the FTHS/WO 3 heterostructure in the present study was up to 0.0581 min −1 . Detailed mechanisms that lead to the enhanced photocatalytic activity of the heterostructures are discussed. In addition, comparative experiments reveal that the photodegradation efficiency of the FTHS/WO 3 heterostructure under visible light irradiation is superior to that of the P25/WO 3 heterostructure prepared from the commercially available TiO 2 catalyst (P25) via the same impregnation method.

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Construction of novel TiO2/Bi4Ti3O12/MoS2 core/shell nanofibers for enhanced visible light photocatalysis

Cited by 46 publications

References 32 publications

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

Core–Shell Nanophotocatalysts: Review of Materials and Applications

Synergistic Effects of Fluorine and WO₃ Nanoparticles on the Surface of TiO₂ Hollow Spheres for Enhanced Photocatalytic Activity under Visible Light Irradiation

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Construction of novel TiO2/Bi4Ti3O12/MoS2 core/shell nanofibers for enhanced visible light photocatalysis

Cited by 46 publications

References 32 publications

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

The Effects of Li+ Doping on Structure and Upconversion Luminescent Properties for Bi3.46Ho0.04Yb0.5Ti3O12: xLi Phosphors

Core–Shell Nanophotocatalysts: Review of Materials and Applications

Synergistic Effects of Fluorine and WO3 Nanoparticles on the Surface of TiO2 Hollow Spheres for Enhanced Photocatalytic Activity under Visible Light Irradiation

Contact Info

Product

Resources

About

Synergistic Effects of Fluorine and WO₃ Nanoparticles on the Surface of TiO₂ Hollow Spheres for Enhanced Photocatalytic Activity under Visible Light Irradiation