Effects of heat and peroxide treatment on photocatalytic activity of titanate nanotubes

Erjavec, Boštjan; Kaplan, Renata; Pintar, Albin

doi:10.1016/j.cattod.2014.04.005

Cited by 54 publications

(32 citation statements)

References 41 publications

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“…Lin et al 8,9 developed a binary alloy, Ti-7.5Mo, with a low elastic modulus and a high strength/modulus ratio. A significant difference in elastic modulus between implants and bone tissue can lead to stress, and thereby may cause poor osseointegration, while an implant with a low elastic modulus can facilitate bone growth 10 .Over the past decade, various techniques such as sol-gel method 11 , hydrothermal method 12 , photo oxidation reaction 13 , electro spinning method 14 and anodization 15,16 of titanium surface modification have been employed to fabricate implant surfaces. These techniques are used to promote osseointegration, faster healing time, higher bone-to-implant contact ratio and longevity of titanium implants 17 .…”

Section: Introductionmentioning

confidence: 99%

Influence of Anodization Parameters in the TiO2 Nanotubes Formation on Ti-7.5Mo Alloy Surface for Biomedical Application

2017

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In this study, the effects of the parameters such as applied potential difference, time and annealing temperature in the titania nanotubes formation were evaluated. The morphology of the nanotubes was evaluted by using Field Emission Gun -Scanning Electron Microscope (FEG-SEM), Atomic Force Microscope (AFM), contact angle and X-rays diffraction (XRD). Self-organized nano-structures were formed on the Ti-7.5Mo alloy surface from the same electrolyte (glycerol/NH4F) for all conditions. It was observed that the potential influenced the diameter while the length was changed according to the anodization time lenght. The presence of the phases anatase and rutile was altered by annealing temperature. Results showed that 20V-48h-450 ºC was the better than other conditions for application as biomaterial.

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Section: Introductionmentioning

confidence: 99%

Influence of Anodization Parameters in the TiO2 Nanotubes Formation on Ti-7.5Mo Alloy Surface for Biomedical Application

2017

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“…For titanate nanotubes, the adsorption-desorption curve of N 2 (Figure 1a) shows a type IV isotherm with hysteresis in the range of P/Po ¼ 0.55-1.0 indicating the presence of mesopores (2-50 nm) and macropores (>50 nm). [18][19][20] The TNT presented a specific surface area of 155 m 2 g À1 and a monomodal behavior for the pore diameter distribution with a maximum of 20 nm (Figure 1b). The image obtained by TEM (Figure 1c) shows the presence of tubes with external diameters around 9.2 AE 0.3 nm.…”

Section: Resultsmentioning

confidence: 99%

Thermal, Mechanical, and Morphological Properties of DPU/Titanate Nanotubes Nanocomposites

Lima

Monteiro

Hoffmann

et al. 2019

Macromolecular Symposia

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Nanocomposites of Titanates Nanotubes (TNTs) and waterborne polyurethane were prepared by physical mixture using ultra turrax disperser. TNTs were synthesized by hydrothermal method and added in different contents: 1, 3, and 5% w/w in relation to polymer weight. Films were prepared and characterized by DSC, TGA, DMA and SEM. The increase of fillers content reduced the thermal stability of DPU nanocomposites compared to pure DPU and did not modify the glass transition temperature. To mechanical properties, the addition of 3% and 5% of TNT increased the Young's modulus when compared with pure DPU, but nanocomposite with 1% of TNT presented a decrease in Young's modulus. The stress × strain curves of DPU/TNT 5% presented characteristic behavior of rigid material, with low deformation, unlike other nanocomposites and pure DPU. SEM and TGA analysis proves that the preparation method used promoted the incorporation and good filler dispersion in the polymer matrix.

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“…The adsorption-desorption isotherms of N 2 (Figure 3b) show that the two nanostructures exhibit a type IV isotherm behavior with a hysteresis in the range P/Po ¼ 0.5-1.0 indicating both the presence of mesopores (2-50 nm) as well as macropores (>50 nm). [14,16,21] Specific area for the nanostructures were 155 m 2 g À1 (NaTNT) and 140 m 2 g À1 (ZnTNT). As shown in Figure 3c, the two nanostructures show monomodal pore diameter distribution, corresponding to pores formed by aggregation of the nanostructures, with maximum at 17 nm (NaTNT) and 15 nm (ZnTNT).…”

Section: Macromolecular Symposiamentioning

confidence: 99%

Titanate Nanotubes Modified With Zinc and Its Application in Post‐Consumer PET Depolymerization

Lima

Monteiro

Toledo

et al. 2019

Macromolecular Symposia

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The development of nanostructures has received notoriety due to the properties that the nanometric scale provides to the material. Among these properties, the increase in the catalytic activity due to the high specific surface area of nanostructures has been the focus of several studies. Among the nanometric catalysts that have been studied, titanate nanotubes present versatility of applications since they can be modified through the functionalization or ion exchange adding the structure metals that increase the catalytic efficiency. For the depolymerization of post‐consumer polyethylene terephthalate (PET) bottles by glycolysis, a chemical recycling method that is in accordance with the principles of sustainable development, which aims to obtain the bis(2‐hydroxyethyl) terephthalate (BHET) monomer, sodium titanate nanotubes (NaTNT) and zinc titanate nanotubes (ZnTNT) were used as catalysts. The nanostructures were efficient in the PET depolymerization reaction for 2, 3, and 4 h, converting PET into BHET with yield higher than 65% (w/w).

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Effects of heat and peroxide treatment on photocatalytic activity of titanate nanotubes

Cited by 54 publications

References 41 publications

Influence of Anodization Parameters in the TiO2 Nanotubes Formation on Ti-7.5Mo Alloy Surface for Biomedical Application

Influence of Anodization Parameters in the TiO2 Nanotubes Formation on Ti-7.5Mo Alloy Surface for Biomedical Application

Thermal, Mechanical, and Morphological Properties of DPU/Titanate Nanotubes Nanocomposites

Titanate Nanotubes Modified With Zinc and Its Application in Post‐Consumer PET Depolymerization

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