The correlation between structural properties, geometrical features, and photoactivity of freestanding TiO<sub>2</sub>nanotubes in comparative degradation of 2,4-dichlorophenol and methylene blue

Pasikhani, Javad Vahabzadeh; Gilani, Neda; Pirbazari, Azadeh Ebrahimian

doi:10.1088/2053-1591/aaaa34

Cited by 17 publications

(6 citation statements)

References 46 publications

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“…The results show that by this process 7.2 % Ag nanoparticles were doped on TNTs. [2]. There are two peaks at 44.24° and 63.8° corresponding to the characteristic of Ag, are observed, which confirms that the existence of Ag in the TNTs.…”

Section: Resultssupporting

confidence: 68%

“…We also calculated the band gap energy from the DR spectra according to Eq. (1) [2] for the synthesized samples.…”

Section: Resultsmentioning

confidence: 99%

“…Ever since the discovery of the photocatalytic splitting of water on titanium dioxide (TiO 2 ) electrodes by Fujishima and Honda in 1972 [1] , TiO 2 have attracted much attention for widespread environmental applications due to its non-toxicity, long-term stability, low cost, chemical inertness, easy availability and high photoactivity [2]. However, its practical application was greatly restricted by the following aspects.…”

Section: Introductionmentioning

confidence: 99%

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The photocatalytic Enhancement of TiO2 Nanotubes by Simultaneously Doping Ag Nanoparticles During Anodization Process: Photocatalytic Degradation of 2,4-Dicholorophenol

Janekbari¹,

Gilani²,

Pirbazari³

2019

Preprint

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Ag-Doped TiO2 nanotubes (TNTs) were fabricated with facile two-step anodization process. In addition, the catalytic activity of Ag-Doped TiO2 nanotubes was examined in photocatalytic degradation of 2,4-dicholorophenol. Characterizing of Ag-Doped TiO2 nanotubes were evaluated by FESEM, TEM, XRD, DRS and Spectrophotometry analyses. Results show that doping Ag nanoparticles uniformly distributed over the TNTs without any distraction in a tubular structure. Anatase crystalline phase was obtained by annealing the Ag-Doped TNTs at 550 °C. DRS results showed the addition of Ag nanoparticles had a sufficient effect of band gap which it decreased the band gap from 2.9 to 2.7. Pure TiO2 nanotubes showed 74% removal of 2,4-dicholorophenol. photocatalytic degradation study indicated that Ag-dopant has an efficient impact on photocatalytic activity of TNTs witch Ag-Doped TNTs could degrade 91% of 2,4-dicholorophenol under UV irradiation.

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Section: Resultssupporting

confidence: 68%

“…We also calculated the band gap energy from the DR spectra according to Eq. (1) [2] for the synthesized samples.…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The photocatalytic Enhancement of TiO2 Nanotubes by Simultaneously Doping Ag Nanoparticles During Anodization Process: Photocatalytic Degradation of 2,4-Dicholorophenol

Janekbari¹,

Gilani²,

Pirbazari³

2019

Preprint

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“…5b. Kubelka-Munk transformation on the UV-Vis absorbents data used to create a Tauc plot was calculated as follows [48].…”

Section: Diffuse Reflectance Spectramentioning

confidence: 99%

One-step fabrication of Ag/RGO doped TiO2 nanotubes during anodization process with high photocatalytic performance

2020

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Reduced graphene oxide (RGO) and Ag nanoparticles were incorporated simultaneously with two-step anodic TiO 2 nanotube through anodization process, and their photocatalytic activity was investigated in the degradation of 2,4-dichlorophenol (2,4-DCP). Furthermore, the optical properties and photocatalytic degradation efficiency were examined as a function of Ag NPs concentration in Ag/RGO-TiO 2 nanotube. Morphological characterization showed that Ag NPs and RGO sheets were well-doped inside and outside the TiO 2 nanotubes' walls. Meanwhile, X-ray diffraction and EDX analysis confirmed the existence of both Ag NPs and RGO. The optical investigation revealed that the incorporation of Ag NPs and RGO with TiO 2 nanotubes improved the light absorbance and the narrowing of TNT bandgap energy (from 2.85 to 2.35 eV). Therefore, among the various samples, Ag50/RGO-TNTs photocatalyst had the most optimal performance, degrading 96% and 66% of 2,4-DCP under UV and visible light irradiation, respectively. The kinetic study confirmed that degradation reactions over all photocatalysts followed zero-order kinetics. Finally, the recovery test of the optimum sample (Ag50/RGO-TNT) showed 6% reduction following 5-cycle photocatalytic degradation of 2,4-DCP under UV irradiation. Keywords Anodic nanotube • Ag nanoparticles • RGO • Photocatalytic degradation List of symbols UV Ultra-violet radiation v Anodization voltage (V) D Mean crystalline size of TiO 2 V Cell volume of TiO 2 d Interplanar spacing E g Energy of band gap h Planck's constant K Scherrer constant C Concentration of pollutant (ppm) C 0 Initial concentration of pollutant (ppm) t Photocatalytic degradation time (min) k abs Apparent rate constant (ppm/min) R 2 Correlation coefficient Greek symbols α Absorption coefficient ϑ Frequency of vibration Subscripts h, k, l Miller coordinates * Neda Gilani

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“…Therefore, the conduction band of photocatalyst needs to be at a potential less than 0 V while the valence band needs to be at a potential more than 1.23 V. To date, a wide range of semiconductors such as TiO2, ZnO, Fe2O3, BiVO4, WO3, CdS, and GaN have been applied for the hydrogen production in photoelectrocatalytic systems [11]. Among the different semiconductors, TiO2 is known as a good candidate for photoelectrocatalytic hydrogen production due to its unique characteristics such as appropriate energy band position, superhydrophilicity, non-toxicity, high chemical stability and low cost [12,13]. According to the published reports in recent years, between the various TiO2 nanostructures, one-dimensional elongated TiO2 nanorods can significantly grant the unidirectional percolation paths for photo-excited charge carriers by providing better connectivity, thus possessing high photoelectrocatalytic activity in hydrogen production [7,14].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Photoelectrocatalytic Performance of TiO<sub>2</sub> Nanorods in Photoelectrochemical Water Splitting Cell by Using an Alcoholic Sacrificial Agent

Hariri¹,

Gilani²,

Pasikhani³

2019

Preprint

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Photoelectrocatalytic water splitting by using various TiO2 nanostructures is a promising approach to generate hydrogen without harmful byproducts. However, their effective performance is restricted by some drawbacks such as high rapid electron-hole pair recombination and backward reaction producing H2O. Thus in this study, the probability of enhancing hydrogen generation rate by adding methanol as a sacrificial agent to the anodic chamber of a two-compartment photoelectrochemical cell is investigated. Herein, one-dimensional elongated TiO2 nanorods that were fabricated via a facile one-pot hydrothermal method are utilized as potent photoanode. Voltammetric characterizations confirm that addition of alcoholic sacrificial agent has a significant effect on photoelectrochemical properties of TiO2 nanorods which by adding 10 wt% of methanol, the photocurrent density and photoconversion efficiency increased from 0.8mA.cm-2 to 1.5mA.cm-2 and from 0.28% to 0.45%, respectively. The results of photoelectrocatalytic water splitting indicated that the hydrogen generation rate in the presence of methanol was about 1.2 times higher than that from pure water splitting. These enhancements can be attributed to the key role of methanol. Methanol molecules not only inhibit the electron-hole pair recombination but also accelerate the hydrogen generation rate by sharing their hydrogen atoms.

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The correlation between structural properties, geometrical features, and photoactivity of freestanding TiO₂nanotubes in comparative degradation of 2,4-dichlorophenol and methylene blue

Cited by 17 publications

References 46 publications

The photocatalytic Enhancement of TiO2 Nanotubes by Simultaneously Doping Ag Nanoparticles During Anodization Process: Photocatalytic Degradation of 2,4-Dicholorophenol

The photocatalytic Enhancement of TiO2 Nanotubes by Simultaneously Doping Ag Nanoparticles During Anodization Process: Photocatalytic Degradation of 2,4-Dicholorophenol

One-step fabrication of Ag/RGO doped TiO2 nanotubes during anodization process with high photocatalytic performance

Enhanced Photoelectrocatalytic Performance of TiO<sub>2</sub> Nanorods in Photoelectrochemical Water Splitting Cell by Using an Alcoholic Sacrificial Agent

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The correlation between structural properties, geometrical features, and photoactivity of freestanding TiO2nanotubes in comparative degradation of 2,4-dichlorophenol and methylene blue

Cited by 17 publications

References 46 publications

The photocatalytic Enhancement of TiO2 Nanotubes by Simultaneously Doping Ag Nanoparticles During Anodization Process: Photocatalytic Degradation of 2,4-Dicholorophenol

The photocatalytic Enhancement of TiO2 Nanotubes by Simultaneously Doping Ag Nanoparticles During Anodization Process: Photocatalytic Degradation of 2,4-Dicholorophenol

One-step fabrication of Ag/RGO doped TiO2 nanotubes during anodization process with high photocatalytic performance

Enhanced Photoelectrocatalytic Performance of TiO<sub>2</sub> Nanorods in Photoelectrochemical Water Splitting Cell by Using an Alcoholic Sacrificial Agent

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The correlation between structural properties, geometrical features, and photoactivity of freestanding TiO₂nanotubes in comparative degradation of 2,4-dichlorophenol and methylene blue