Crystalline deformation and photoluminescence of titanium dioxide nanotubes during in situ hybridization with graphene: An example of the heterogeneous photocatalyst

Sang, Nguyen Xuan; Hương, Phạm Thị Lan; Thy, Tran Thi Mai; Dat, Phan Tan; Minh, Vo Cao; Tho, Nguyen Huu

doi:10.1016/j.spmi.2018.07.020

Cited by 15 publications

(18 citation statements)

References 23 publications

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“…(422) planes, respectively, were attributed to monoclinic structure of H3Ti2O7 [10][11][12][13]. In addition, there appeared anatase TiO2 peaks at 25.23 o , 38.15 o and 54.48 o corresponding to the (101), (004) and (105) planes, respectively [5,[14][15]. On the XRD pattern of D/TNT composite, these appear the characteristic peaks similar to TNT.…”

Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 94%

“…TNT material was synthesized by hydrothermal method in a 150 ml 58eflon-sealed stainless steel autoclave for 24h at 135 o C as described previously [5,8]. Typically, firstly, 34g NaOH was dissolved in 78 ml DI water by magnetic stirring for 15 min.…”

Section: Hydrothermal Synthesis Of Tnt and D/tnt Compositementioning

confidence: 99%

“…However, TNT has a large bandgap which does not consume visible light effectively for the photocatalytic application. Many studies have been carried out to reduce the bandgap and, thus enhance photocatalytic ability [4][5]. Diatoms, i.e.…”

Section: Introductionmentioning

confidence: 99%

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Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

Sang

Minh²,

Phuc³

et al. 2020

MaP

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In this study, homogeneous titanate tubular (TNT) and diatom/TNT composites (D/TNT) were prepared by a facile hydrothermal method. The crystalline structure and morphology of the synthesised samples were studied by X-ray diffractometry (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM). Furthermore, the photocatalytic activity for degradation of methylene blue (MB) was investigated under sunlight irradiation. The results showed that the MB degradation by D/TNT was higher than bare TNT. Optical properties of the synthesized materials with enhanced photocatalytic activity could be explained through both UV-vis diffuse absorption and photoluminescence emission measurement. These results indicated that there was bandgap narrowing and longer carrier lifetime in the composite sample.

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Section: Transmission Electron Microscopy (Tem)mentioning

confidence: 94%

Section: Hydrothermal Synthesis Of Tnt and D/tnt Compositementioning

confidence: 99%

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Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

Sang

Minh²,

Phuc³

et al. 2020

MaP

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“…It can be observed that the PL peak intensity gradually increases with increasing calcination temperature. Yu et al and Sang et al [58,59] reported that low PL intensity suggests a low recombination rate of excited charges on the surface of the photocatalyst. As expected, the high crystallinity and low number of defects sites results in a lower PL intensity, which is consistent with XRD patterns.…”

Section: Optical Propertiesmentioning

confidence: 99%

Visible Light Photodegradation of Formaldehyde over TiO2 Nanotubes Synthesized via Electrochemical Anodization of Titanium Foil

et al. 2020

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In this study, a series of TiO2 nanotubes (NTs) were synthesized employing electrochemical anodization of titanium foil in an ionic liquid solution containing a mixture of glycerol and choline chloride, acting as electrolyte. The as-synthesized TiO2 NTs were calcined at 350, 450, or 550 °C for a 2 h duration to investigate the influence of calcination temperature on NTs formation, morphology, surface properties, crystallinity, and subsequent photocatalytic activity for visible light photodegradation of gaseous formaldehyde (HCHO). Results showed that the calcination temperature has a significant effect on the structure and coverage of TiO2 NTs on the surface. Freshly synthesized TiO2 NTs showed better-ordered structure compared to calcined samples. There was significant pore rupture with increasing calcination temperature. The transformation from anatase to rutile phase appeared after calcination at 450 °C and the weight fraction of the rutile phase increased from 19% to 36% upon increasing the calcination temperature to 550 °C. The band gaps of the TiO2 NTs were in the range from 2.80 to 2.74 eV, shifting the active region of the materials to visible light. The presence of mixed anatase–rutile TiO2 phases in the sample calcined at 450 °C showed enhanced photoactivity, which was confirmed by the 21.56 mg∙L−1∙g−1 removal of gaseous formaldehyde under 120 min of visible light irradiation and displayed enhanced quantum yield, ∅HCHO of 17%.

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“…Finally, the solution was under direct sunlight irradiation and UV-Vis absorption measurement (DR 5000) was recorded after every 30 min of irradiation until 150 min. The photocatalytic efficiency for MB degradation could be calculated as [19]:…”

Section: Photocatalytic Activitymentioning

confidence: 99%

Effect of annealing temperature on photoluminescence emission and photocatalytic activity of hydrothermal ZnO nanorods

Xuan

2019

MaP

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This work reports photoluminescence evolution of hydrothermally homogeneous ZnO nanorods under thermal annealing at various temperatures. The crystalline structure and morphology of synthesized samples were characterized by X-ray diffractometry and Scanning electron microscopy. The optical properties which induced defect state transition were investigated by photoluminescence emission. Besides defect states induced emissions in the visible range, the photocatalytic activity of annealed samples was evaluated which indicated that the higher visible photoluminescence intensity gives the better catalytic activity.

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Crystalline deformation and photoluminescence of titanium dioxide nanotubes during in situ hybridization with graphene: An example of the heterogeneous photocatalyst

Cited by 15 publications

References 23 publications

Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

Titanate Tubular Loaded Diatom Fabricated by a Facial Hydrothermal Method for Photocatalytic Enhancement under Visible Light Irradiation

Visible Light Photodegradation of Formaldehyde over TiO2 Nanotubes Synthesized via Electrochemical Anodization of Titanium Foil

Effect of annealing temperature on photoluminescence emission and photocatalytic activity of hydrothermal ZnO nanorods

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