Synthesis of defect-rich hierarchical sponge-like TiO2 nanoparticles and their improved photocatalytic and photoelectrochemical performance

Tian, Qizhi; Ji, Yajun; Ojan, Yiyi; Abulizi, Abulikemu

doi:10.1007/s11706-020-0517-5

Cited by 5 publications

(5 citation statements)

References 41 publications

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“…As a result of the external vibration of Ti–O bonds, the strongest Eg mode (154.7 cm –1 ) in B-TiO 2 microparticles has an obvious blue shift to 163.6 cm –1 . Generally, the peaks observed in the B-TiO 2 Raman spectrum are not only much less intense than those observed in the W-TiO 2 Raman spectrum but also broadened . The Raman spectrum changes result from the stoichiometry of the oxygen and Ti 3+ centers, which confirms the XRD results.…”

Section: Resultssupporting

confidence: 78%

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Urease-Powered Black TiO₂ Micromotors for Photothermal Therapy of Bladder Cancer

Amiri,

Hasani,

Abedini

et al. 2024

ACS Appl. Mater. Interfaces

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Urease-powered nano/micromotors can move at physiological urea concentrations, making them useful for biomedical applications, such as treating bladder cancer. However, their movement in biological environments is still challenging. Herein, Janus micromotors based on black TiO 2 with urease asymmetric catalytic coating were designed to take benefit of the optical properties of black TiO 2 under near-infrared light and the movement capability in simulated bladder environments (urea). The black TiO 2 microspheres were halfcoated with a thin layer of Au, and L-Cysteine was utilized to attach the urease enzyme to the Au surface using its thiol group. Biocatalytic hydrolysis of urea through urease at biologically relevant concentrations provided the driving force for micromotors. A variety of parameters, such as urea fuel concentration, viscosity, and ionic character of the environment, were used to investigate how micromotors moved in different concentrations of urea in water, PBS, NaCl, and urine. The results indicate that micromotors are propelled through ionic self-diffusiophoresis caused by urea enzymatic catalysis. Due to their low toxicity and in vitro anticancer effect, micromotors are effective agents for photothermal therapy, which can help kill bladder cancer cells. These promising results suggest that biocompatible micromotors hold great potential for improving cancer treatment and facilitating diagnosis.

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Section: Resultssupporting

confidence: 78%

“…Generally, the peaks observed in the B-TiO 2 Raman spectrum are not only much less intense than those observed in the W-TiO 2 Raman spectrum but also broadened. 43 The Raman spectrum changes result from the stoichiometry of the oxygen and Ti 3+ centers, which confirms the XRD results.…”

Section: Fabrication and Characterization Of The B-tiosupporting

confidence: 82%

Urease-Powered Black TiO₂ Micromotors for Photothermal Therapy of Bladder Cancer

Amiri,

Hasani,

Abedini

et al. 2024

ACS Appl. Mater. Interfaces

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“…[20] The presence of site defects would form new bands that reduced the band gap energy, aided in charge migration, lowered electron-hole recombination rate, and offered better photoactivity under visible light irradiation. [32][33][34] Figure 4a displays PL spectra under the excitation wavelength of 330 nm, which verified the recombination rate of the photogenerated charge carriers for the catalysts. The band at 420 nm corresponded to the surface recombination transition, whereas the bands at 455 and 530 nm were attributed to the OV.…”

Section: Physicochemical Properties Of the Catalystsmentioning

confidence: 81%

“…[ 20 ] The presence of site defects would form new bands that reduced the band gap energy, aided in charge migration, lowered electron–hole recombination rate, and offered better photoactivity under visible light irradiation. [ 32–34 ]…”

Section: Resultsmentioning

confidence: 99%

“…These properties have greatly helped to shift the optical response of TiO 2 from UV to the visible light region. [32,33,65] The synergistic effect between the mixed phases along with the TSDs and OVs have assisted in charge migration and inhibited electronhole recombination. [66,67] Under sunlight irradiation, MTN has displayed the best photocatalytic performance followed by P25, which also presented high photocatalytic degradation.…”

Section: Photocatalytic Activity Of the Catalystsmentioning

confidence: 99%

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Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Marfur

Jaafar

2021

J Chinese Chemical Soc

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The impact of different light irradiation was studied on photocatalytic degradation of 2‐chlorophenol (2‐CP) using mesoporous titania nanoparticles (MTNs) prepared by microwave‐assisted methods. The photoactivity of MTNs was also compared with pretreated commercial TiO2 and Degussa P25 (P25). The reactions were conducted for 2.5 hr under UV‐A, UV‐C, sunlight, and visible light using a batch reactor. The catalysts were characterized by X‐ray powder diffractometer, UV–Vis diffuse reflectance spectroscopy, photoluminescence, Brunauer–Emmett–Teller method, field‐emission scanning electron microscopy, transmission electron microscopy, and X‐ray photoelectron spectroscopy. The characterization results confirmed that MTN consisted a composition of 21% rutile phase and 79% anatase phase with Ti3+ site defects (TSDs) and oxygen vacancies (OVs) in their structures because of their anionic surfactant nature, microwave heating, and high calcination temperature during the catalyst preparation. Besides, the photoactivity of MTN upon degradation of 2‐CP under sunlight has exhibited the best performance with 100% degradation followed by UV‐A, visible light, and UV‐C with degradation of 96, 52, and 39%, respectively. MTNs showed a remarkable performance due to their mixed‐phase crystalline structures as well as the formation of TSDs and OVs, which improved the charge migration, lowered the band gap energy, and reduced the rate of electron–hole recombination, thus succeeded to be activated under a wide range of light responses.

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Construction of ternary heterojunction AgI/C-MoS2 nanosheets with enhanced visible-light photocatalytic property and self-cleaning performance

Niu

Yan

et al. 2021

Front. Mater. Sci.

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Synthesis of defect-rich hierarchical sponge-like TiO2 nanoparticles and their improved photocatalytic and photoelectrochemical performance

Cited by 5 publications

References 41 publications

Urease-Powered Black TiO₂ Micromotors for Photothermal Therapy of Bladder Cancer

Urease-Powered Black TiO₂ Micromotors for Photothermal Therapy of Bladder Cancer

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Construction of ternary heterojunction AgI/C-MoS2 nanosheets with enhanced visible-light photocatalytic property and self-cleaning performance

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Synthesis of defect-rich hierarchical sponge-like TiO2 nanoparticles and their improved photocatalytic and photoelectrochemical performance

Cited by 5 publications

References 41 publications

Urease-Powered Black TiO2 Micromotors for Photothermal Therapy of Bladder Cancer

Urease-Powered Black TiO2 Micromotors for Photothermal Therapy of Bladder Cancer

Insight into the influence of defect sites in mixed phase of mesoporous titania nanoparticles toward photocatalytic degradation of 2‐chlorophenol: Effect of light source

Construction of ternary heterojunction AgI/C-MoS2 nanosheets with enhanced visible-light photocatalytic property and self-cleaning performance

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Product

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Urease-Powered Black TiO₂ Micromotors for Photothermal Therapy of Bladder Cancer

Urease-Powered Black TiO₂ Micromotors for Photothermal Therapy of Bladder Cancer