Hydrothermal temperature as a morphological control factor: Preparation, characterization and photocatalytic activity of titanate nanotubes and nanoribbons

Thennarasu, Sathiah; Rajasekar, K.; Ameen, K. Balkis

doi:10.1016/j.molstruc.2013.06.064

Cited by 29 publications

(12 citation statements)

References 81 publications

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“…As the reaction duration is longer, an increase in the number of randomly tangled TNT formed was observed. This finding is in agreement with the findings of [20] (2010) which indicated the yield of nanotubes increased with the hydrothermal duration [27]. The average diameter size of the TNT is in a range of 15-30 nm.…”

Section: Photocatalytic Activity Of Alkaline Treated Tntsupporting

confidence: 93%

Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Lai

Hamid

Tan

et al. 2015

Journal of Nanomaterials

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One-dimensional (1D) titanate nanotubes (TNT) were successfully synthesized using alkaline hydrothermal treatment of commercial TiO2nanopowders in a Teflon lined stainless steel autoclave at 150°C. The minimum time required for the formation of the titanate nanotubes was 9 h significantly. After the hydrothermal processing, the layered titanate was washed with acid and water in order to control the amount of Na+ions remaining in the sample solutions. In this study, the effect of different reaction durations in a range of 3 h to 24 h on the formation of nanotubes was carried out. As the reaction duration is extended, the changes in structure from particle to tubular shapes of alkaline treated TiO2were obtained via scanning electron microscope (SEM). Also, the significant impact on the phase transformation and crystal structure of TNT was characterized through XRD and Raman analysis. Indeed, the photocatalytic activity of TNT was investigated through the degradation of methyl orange aqueous solution under the ultraviolet light irradiation. As a result, TNT with reaction duration at 6 h has a better photocatalytic performance than other samples which was correlated to the higher crystallinity of the samples as shown in XRD patterns.

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Section: Photocatalytic Activity Of Alkaline Treated Tntsupporting

confidence: 93%

Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Lai

Hamid

Tan

et al. 2015

Journal of Nanomaterials

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“…Figures 3 shows the diffraction pattern obtained of TiO 2 precursor (anatase phase) and the characteristics peaks are situated at 2θ= 25° (101), 38° (004), 48° (200), 53° (106) and 62° (215) in agreement with the assignments described in literature 26,27 . In relation to TNT diffractogram, this shows disappearance of the fine peak situated at 2θ= 25° (101), main peak of anatase phase and appearance of signs of lamellar titanates, 2θ=24° (110), 28° (211), 48° (020) and 62° (422) 28,29 and the peak at around 2θ=10° assigned to the interlayer distance 30 .…”

Section: Titanate Nanotubes (Tnt)mentioning

confidence: 93%

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

et al. 2017

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The final destination of PET packaging is creating economic and environmental concerns. One of the alternatives to minimize this problem would be making use of chemical recycling of this material through glycolysis with the aim to produce bis(hydroxiethyl) terephthalate, BHET monomer. This reaction is well known, but it still presents problems as BHET purity since it makes necessary the development of new catalysts highly selective. In this context, the present work studied the catalytic activity of a nanostructured material, titanate nanotubes (TNT), and compared it to a commercial catalyst (zinc acetate), which is the most used for this glycolysis reaction according to literature researches, and analyzed the influence of PET type (virgin and post-consumer) in the depolymerization for reaction times of 2, 3 and 4 hours. Using TNT as catalyst, BHET production yield and values of turnover number for the evaluated reaction times were higher than the results using Zn(OAc) 2 for virgin PET, proving itself as a promising catalyst.

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“…This is explained by the mechanism of the photodegradation of pollutants, based on the absorption of ultraviolet light with greater photonic energy than the band gap of the semiconductor. This leads to simultaneous oxidative and reductive reactions (electron-hole pair) within the species surface before recombination (Thennarasua et al, 2013). In other words, the dye molecules are physically adsorbed on the SiO 2 nanoparticles (Anbia and Salehi, 2012) and this physical bond decreases by increasing the temperature.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic Degradation of Methylene Blue Dye Using Silica Oxide Nanoparticles as a Catalyst

Aly

Abd-Elhamid

2018

Water Environment Research

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The present research deals with the development a fast and low-cost method for removing color dye from water using nanosized semiconductors SiO2 as photocatalyst. The studies of kinetic photocatalytic degradation were carried out on an aqueous solution of soluble methylene blue dye, which contained SiO2 nanoparticles and under an ultraviolet light source. Different parameters affecting the process have been studied: catalyst concentration, dye concentration, temperature, and pH of solution. The color variation was detected at three absorption bands (662, 293, and 243 nm). It was found that the dye completely degraded in 90 s, using 10 g/L SiO2 nanoparticles at 25 °C and pH 1.5 and 11.0. The adsorption of the dye well-fitted pseudo-second-order kinetic models. The Langmuir-Hinshelwood model was acquired to analyze the photocatalytic degradation process. A possible molecular mechanism for photocatalytic degradation of the dye by SiO2 nanoparticles is also given.

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Hydrothermal temperature as a morphological control factor: Preparation, characterization and photocatalytic activity of titanate nanotubes and nanoribbons

Cited by 29 publications

References 81 publications

Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Rapid Formation of 1D Titanate Nanotubes Using Alkaline Hydrothermal Treatment and Its Photocatalytic Performance

Titanate Nanotubes as New Nanostrutured Catalyst for Depolymerization of PET by Glycolysis Reaction

Photocatalytic Degradation of Methylene Blue Dye Using Silica Oxide Nanoparticles as a Catalyst

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