Effect of a pulsed electric field on the synthesis of TiO2 and its photocatalytic performance under visible light irradiation

Han, Bing; Chen, Zhi; Louhi-Kultanen, Marjatta

doi:10.1016/j.powtec.2016.11.053

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…Hence, removing above the organic dyes from the colored wastewater has attracted widely attention and deeply research. In the past decades, titanium dioxide (TiO 2 ) has been extensively used as the photocatalyst for degradation of the organic contaminants in the environment under ultraviolet (UV) or visible light irradiation, because of its high stability, strong redox ability, nontoxicity, good corrosion resistance, and low cost [3,4]. TiO 2 has three kinds of phases, anatase (tetragonal, space group I 4 1 / amd ), rutile (tetragonal, space group P 42 1 / mmm ), and brookite (orthorhombic, space group Pbca ), among which anatase is mostly used as photocatalysts, since it is traditionally considered that the anatase phase has lower rates of recombination and smaller grain size than the other phases, which may be favorable and preferable to achieve better photocatalytic efficiency [1,5].…”

Section: Introductionmentioning

confidence: 99%

Facile Formation of Anatase/Rutile TiO2 Nanocomposites with Enhanced Photocatalytic Activity

Bai

et al. 2019

Molecules

159

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Anatase/rutile mixed-phase TiO2 nanoparticles were synthesized through a simple sol-gel route with further calcination using inexpensive titanium tetrachloride as a titanium source, which effectively reduces the production cost. The structural and optical properties of the prepared materials were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), and UV-vis adsorption. The specific surface area was also analyzed by Brunauer–Emmett–Teller (BET) method. The anatase/rutile mixed-phase TiO2 nanocomposites containing of rod-like, cuboid, and some irregularly shaped anatase nanoparticles (exposed {101} facets) with sizes ranging from tens to more than 100 nanometers, and rod-like rutile nanoparticles (exposed {110} facets) with sizes ranging from tens to more than 100 nanometers. The photocatalytic activities of the obtained anatase/rutile mixed-phase TiO2 nanoparticles were investigated and compared by evaluating the degradation of hazardous dye methylene blue (MB) under ultraviolet light illumination. Compared to the commercial Degussa P25-TiO2, the mixed-phase TiO2 nanocomposites show better photocatalytic activity, which can be attributed to the optimal anatase to rutile ratio and the specific exposed crystal surface on the surface. The anatase/rutile TiO2 nanocomposites obtained at pH 1.0 (pH1.0-TiO2) show the best photocatalytic activity, which can be attributed to the optimal heterojunction structure, the smaller average particle size, and the presence of a specific exposed crystal surface. The enhanced photocatalytic activity makes the prepared anatase/rutile TiO2 photocatalysts a potential candidate in the removal of the organic dyes from colored wastewater.

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Section: Introductionmentioning

confidence: 99%

Facile Formation of Anatase/Rutile TiO2 Nanocomposites with Enhanced Photocatalytic Activity

Bai

et al. 2019

Molecules

159

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“…The maximum absorption peak of MB at 664 nm gradually decreased and moved towards the short wavelength (from 664 nm to 620 nm) as the extent of irradiation time (from 0 min to 90 min), implying that the benzene rings/heterocyclic rings of the MB moleculeswere broken downinto small molecules/ions, resulting in the mineralization of MB [39] . Figure 10(b) shows the degradation efficiency (( c 0 ‐ c t )/ c 0 ×100 %) of MB solution versus irradiation time, where c 0 is the initial concentration of MB after the adsorption equilibrium and c t is the concentration at specific reaction time [40] . It can be seen from the Figure 10(b), the anatase TiO 2 nanocrystals with {101}, {010}/{100} and [111]‐facets coexistence exhibit higher photocatalytic activity than the benchmark Bodi‐TiO 2 and the blank sample.…”

Section: Resultsmentioning

confidence: 99%

“…[39] Figure 10(b) shows the degradation efficiency ((c 0 -c t )/c 0 × 100 %) of MB solution versus irradiation time, where c 0 is the initial concentration of MB after the adsorption equilibrium and c t is the concentration at specific reaction time. [40] It can be seen from the Figure 10(b), the anatase TiO 2 nanocrystals with {101}, {010}/{100} and [111]-facets coexistence exhibit higher photocatalytic activity than the benchmark Bodi-TiO 2 and the blank sample. Degradation of 94.1 %, 87.0 %, 85.9 %, 84.3 %, 84.2 %, 79.5 %, 64.9 %, and 9.4 % MB for 0.5HF-TiO 2 , 2.0HF-TiO 2 , 1.5HF-TiO 2 , 1.0HF-TiO 2 , 2.5HF-TiO 2 , 3.0HF-TiO 2 , Bodi-TiO 2 , and the blank sample, respectively, after 90 min UV light irradiation were achieved.…”

Section: Photocatalytic Activity Of the Anatase Tio 2 Nanocrystalswitmentioning

confidence: 96%

FacileSynthesis of Anatase TiO₂Nanocrystals with Co‐Exposed{101}, {010}/{100} and [111]‐Facets for EfficientPhotodegradation of Methylene Blue

Niu

Zhang

et al. 2021

ChemistrySelect

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Cuboid‐shaped anatase TiO2 nanocrystals with co‐exposed {101} and [111]‐facets (or {101} and {100} facets), diamond‐shaped, rod‐like and irregular anatase TiO2 nanocrystals with dominant {010} facets were controllably synthesized from titanium (IV) ethoxide (TEOT) using HF as a capping agent via a facile sol‐gel procedure, and characterized by X‐ray powderdiffraction (XRD), field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), nitrogen adsorption, photoluminescence (PL) spectra, UV‐vis diffuse reflectance spectra,and electrochemical impedance spectroscopy (EIS). For the as‐prepared anatase TiO2 nanocrystals, the 0.5HF‐TiO2 revealed the best photocatalytic efficiency under UV light irradiation: 94.1 % of methylene blue (MB) was photodegraded within 90 min. The reaction rate constant k(min−1) was 1.39, 1.47, 1.59, 1.66, 1.92, 2.75, and 30.5 times higher than that of 2.0HF‐TiO2 (2.20×10−2 min−1), 1.5HF‐TiO2 (2.07×10−2 min−1), 1.0HF‐TiO2 (1.92×10−2 min−1), 2.5HF‐TiO2 (1.84×10−2 min−1), 3.0HF‐TiO2 (1.59×10−2 min−1), Bodi‐TiO2 (1.11×10−2 min−1), and the blank sample (0.10×10−2 min−1), respectively. Compared to other as‐prepared anatase TiO2 nanocrystals with the similar co‐exposed crystal facets, the highest efficiency of 0.5HF‐TiO2 could be attributed to the minimum crystal size,narrower pore size distribution, the maximum specific surface area, the lowest PL intensity and charge‐transfer resistance, andthe smallestrecombination resistance.

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“…In addition, the complex response of different substances to EFs is worth studying to understand fully the mechanism of nucleation and crystal growth under such conditions [86].…”

Section: Perspectivementioning

confidence: 99%

Recent Insights into the Crystallization Process; Protein Crystal Nucleation and Growth Peculiarities; Processes in the Presence of Electric Fields

Nanev

2017

Crystals

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Three-dimensional protein molecule structures are essential for acquiring a deeper insight of the human genome, and for developing novel protein-based pharmaceuticals. X-ray diffraction studies of such structures require well-diffracting protein crystals. A set of external physical factors may promote and direct protein crystallization so that crystals obtained are useful for X-ray studies. Application of electric fields aids control over protein crystal size and diffraction quality. Protein crystal nucleation and growth in the presence of electric fields are reviewed. A notion of mesoscopic level of impact on the protein crystallization exercised by an electric field is also considered.Keywords: protein crystallization; classical and two-step nucleation mechanisms; impact of electric fields on the protein crystallization; external and internal electric fields; number density; size and quality of protein crystals

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Effect of a pulsed electric field on the synthesis of TiO2 and its photocatalytic performance under visible light irradiation

Cited by 6 publications

References 39 publications

Facile Formation of Anatase/Rutile TiO2 Nanocomposites with Enhanced Photocatalytic Activity

Facile Formation of Anatase/Rutile TiO2 Nanocomposites with Enhanced Photocatalytic Activity

FacileSynthesis of Anatase TiO₂Nanocrystals with Co‐Exposed{101}, {010}/{100} and [111]‐Facets for EfficientPhotodegradation of Methylene Blue

Recent Insights into the Crystallization Process; Protein Crystal Nucleation and Growth Peculiarities; Processes in the Presence of Electric Fields

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Effect of a pulsed electric field on the synthesis of TiO2 and its photocatalytic performance under visible light irradiation

Cited by 6 publications

References 39 publications

Facile Formation of Anatase/Rutile TiO2 Nanocomposites with Enhanced Photocatalytic Activity

Facile Formation of Anatase/Rutile TiO2 Nanocomposites with Enhanced Photocatalytic Activity

FacileSynthesis of Anatase TiO2Nanocrystals with Co‐Exposed{101}, {010}/{100} and [111]‐Facets for EfficientPhotodegradation of Methylene Blue

Recent Insights into the Crystallization Process; Protein Crystal Nucleation and Growth Peculiarities; Processes in the Presence of Electric Fields

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FacileSynthesis of Anatase TiO₂Nanocrystals with Co‐Exposed{101}, {010}/{100} and [111]‐Facets for EfficientPhotodegradation of Methylene Blue