Dramatic promotion of visible-light photoreactivity of TiO2 hollow microspheres towards NO oxidation by introduction of oxygen vacancy

Zhao, Huahua; Li, Kaining; Wu, Xiaofeng; Wang, Ning; Li, Xiaofang; Li, Qin; Li, Lin; Lv, Kangle

doi:10.1016/j.apcatb.2019.117860

Cited by 160 publications

(58 citation statements)

References 40 publications

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“…As shown in Supplementary Fig. 14 , a slight EPR signal should originate from the oxygen vacancy-trapped electrons, which means that some oxygen vacancies were generated on the surface of FCL NSs 47 Because two extra electrons are left once an oxygen atom is removed from the surface of the metallic oxide, that will lead to increased electron cloud density around the metal and O atoms near the oxygen vacancy sites 48 . Comparison of high-resolution XPS spectra in the Mg 1s (Supplementary Fig.…”

Section: Resultsmentioning

confidence: 99%

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

et al. 2021

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Clay-based nanomaterials, especially 2:1 aluminosilicates such as vermiculite, biotite, and illite, have demonstrated great potential in various fields. However, their characteristic sandwiched structures and the lack of effective methods to exfoliate two-dimensional (2D) functional core layers (FCLs) greatly limit their future applications. Herein, we present a universal wet-chemical exfoliation method based on alkali etching that can intelligently “capture” the ultrathin and biocompatible FCLs (MgO and Fe2O3) sandwiched between two identical tetrahedral layers (SiO2 and Al2O3) from vermiculite. Without the sandwich structures that shielded their active sites, the obtained FCL nanosheets (NSs) exhibit a tunable and appropriate electron band structure (with the bandgap decreased from 2.0 eV to 1.4 eV), a conductive band that increased from −0.4 eV to −0.6 eV, and excellent light response characteristics. The great properties of 2D FCL NSs endow them with exciting potential in diverse applications including energy, photocatalysis, and biomedical engineering. This study specifically highlights their application in cancer theranostics as an example, potentially serving as a prelude to future extensive studies of 2D FCL NSs.

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Section: Resultsmentioning

confidence: 99%

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

et al. 2021

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“…(9) Some updated techniques could be introduced to further improve the photocatalytic activity of MXene-based photocatalysts, such as the localized surface plasmon resonance effect [1,108,109], defective engineering [110,111], and single-atom catalysis [112,113]. These approaches can be used to improve light harvesting ability, stimulate the separation of photo-generated charge carriers, and provide unique active sites, which can further enhance the photoreactivity of MXene-based photocatalysts.…”

Section: Discussionmentioning

confidence: 99%

MXenes as noble-metal-alternative co-catalysts in photocatalysis

Zhang

et al. 2021

Chinese Journal of Catalysis

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267

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“…The production of Ti 3+ due to the incorporation of atomically dispersed Fe was further confirmed by electron paramagnetic resonance spectrum ( Figure 3D), where the intensity of the signal at g = 1.992, assigning to the produced Ti 3+ . [14][15][16] The intensity of the signal steadily increases with increase in the amount of introduced Fe.…”

Section: Recently Single-atom Catalysts Have Aroused Extensive Attenmentioning

confidence: 99%

Fe₁/TiO₂ Hollow Microspheres: Fe and Ti Dual Active Sites Boosting the Photocatalytic Oxidation of NO

Zhao

Zhang

et al. 2020

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Recently, single‐atom catalysts have aroused extensive attention in fields of clean energy and environmental protection due to their unique activity and efficient utilization of the active atoms. It is of great importance but still remains a great challenge to unveil the effect of single atoms on precise catalysis. Herein, it is reported that doping TiO2 hollow microspheres (TiO2‐HMSs) with single atomic Fe can boost the photoreactivity of TiO2‐HMSs towards NO oxidation due to the synergistic effects of atomically dispersed Fe and bonded Ti atom which act as dual active sites. The atomically dispersed Fe atoms occupy the subsurface Ti vacancies, and the interaction between Ti 3d and Fe 3d orbitals result in the formation of FeTi bond. Single atomic Fe modulates the electronic structure of the bonded Ti atoms by electron transfer, which facilitates the adsorption and activation of NO and O2 at Fe and bonded Ti sites, respectively. In addition, the introduction of single atomic Fe sharply suppresses the production of toxic NO2 byproduct. The synergistic effects of the dual active sites then cause a drastic promotion in photocatalytic oxidation of NO.

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Dramatic promotion of visible-light photoreactivity of TiO2 hollow microspheres towards NO oxidation by introduction of oxygen vacancy

Cited by 160 publications

References 40 publications

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

MXenes as noble-metal-alternative co-catalysts in photocatalysis

Fe₁/TiO₂ Hollow Microspheres: Fe and Ti Dual Active Sites Boosting the Photocatalytic Oxidation of NO

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Dramatic promotion of visible-light photoreactivity of TiO2 hollow microspheres towards NO oxidation by introduction of oxygen vacancy

Cited by 160 publications

References 40 publications

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

Capturing functional two-dimensional nanosheets from sandwich-structure vermiculite for cancer theranostics

MXenes as noble-metal-alternative co-catalysts in photocatalysis

Fe1/TiO2 Hollow Microspheres: Fe and Ti Dual Active Sites Boosting the Photocatalytic Oxidation of NO

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Fe₁/TiO₂ Hollow Microspheres: Fe and Ti Dual Active Sites Boosting the Photocatalytic Oxidation of NO