Increasing the specific surface area of Cr-doped TiO2 nanoparticles by controlling the drying time for DSSC applications

2017 ◽  
Vol 28 (20) ◽  
pp. 15233-15238 ◽  
Author(s):  
Morteza Asemi ◽  
Abdollah Suddar ◽  
Majid Ghanaatshoar
Keyword(s):  
Specific Surface ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
Specific Surface Area ◽  
Drying Time ◽  
Doped Tio2

Discrepancy between thermodynamic and kinetic stabilities of thetert-butanol hydrates and its implication for obtaining pharmaceutical powders by freeze-drying

2019 ◽  
Vol 55 (29) ◽  
pp. 4262-4265 ◽  
Author(s):  
A. G. Ogienko ◽  
A. S. Stoporev ◽  
A. A. Ogienko ◽  
M. S. Mel’gunov ◽  
T. P. Adamova ◽  
...  
Keyword(s):  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Freeze Drying ◽  
Pharmaceutical Powders ◽  
Drying Time ◽  
Freeze Dried

The substitution of sublimed “H1 + Ih” for “H2 + Ih” leads to both a reduction of primary drying time and a significant increase in specific surface area of the trehalose freeze-dried cakes.

Amine coupled ordered mesoporous (Co–N) co-doped TiO2: a green photocatalyst for the selective aerobic oxidation of thioether

2017 ◽  
Vol 7 (18) ◽  
pp. 4182-4192 ◽  
Author(s):  
Mingming Zou ◽  
Lu Feng ◽  
Tiju Thomas ◽  
Minghui Yang
Keyword(s):  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Aerobic Oxidation ◽  
Doped Tio2 ◽  
Ordered Mesoporous ◽  
Selective Aerobic Oxidation ◽  
Co Doped

Selective aerobic oxidation (conversion ∼76.4%) of thioether to sulfoxide is achieved using triethylamine-coupled mesoporous Co–N–TiO2 (specific surface area: 124 m2 g−1) visible-light photocatalysts.

scholarly journals Graphene Oxide Hybridised TiO2 for Visible Light Photocatalytic Degradation of Phenol

Symmetry ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1420 ◽  
Author(s):  
Guanyu Wang ◽  
Weijie Guo ◽  
Deping Xu ◽  
Di Liu ◽  
Mengtao Qin
Keyword(s):  
Electron Microscopy ◽  
Photocatalytic Activity ◽  
Graphene Oxide ◽  
Visible Light ◽  
Specific Surface ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
Specific Surface Area ◽  
Phenol Solution ◽  
X Ray

In industrial pollutants, phenol is a kind of degradation-resistant hazardous compound. It is generated during industrial processes in factories and treatment at sewage plants. In this study, we analyse the photocatalytic activity of TiO2 and rGO as a composite for the degradation of phenol. Hybridised titanium dioxide/reduced graphene oxide (TiO2/rGO) nanocomposites were synthesised by a simple hydrothermal method using flake graphite and tetrabutyl titanate as raw materials. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Brunauer–Emmet–Teller (BET) specific area analysis, Fourier transform infrared spectroscopy (FTIR), Raman, X-ray photoelectron spectroscopy (XPS), photoelectrochemical analysis, and UV–vis diffuse reflectance spectra (DRS) were employed to characterise the physicochemical properties of the as-prepared nanocomposites. The results showed the TiO2/rGO nanocomposites’ significant anatase phase and a small fraction of the rutile phase the same as that of the as-prepared TiO2 nanoparticles. The spherical TiO2 nanoparticles (diameter 20–50 nm) were agglomerated slightly and the agglomerates were anchored on the rGO sheets and dispersed symmetrically. The specific surface area of TiO2/rGO-4% nanocomposites was 156.4 m2/g, revealing a high specific surface area. Oxygen-containing functional groups that existed in TiO2/rGO-4% nanocomposites were almost removed during hydrothermal processing. The photocurrent response of TiO2/rGO-4% was strongest among the TiO2/rGO nanocomposites, and the bandgap of TiO2/rGO-4% was 2.91 eV, showing a redshift of absorption into the visible region, which was in favour of the high photocatalytic activity of TiO2/rGO nanocomposites under visible light (λ > 420 nm). Moreover, the samples were employed to photodegrade phenol solution under visible light irradiation. TiO2/rGO-4% nanocomposite degraded the phenol solution up to 97.9%, and its degradation rate constant was 0.0190 h−1, which had higher degradation activity than that of other TiO2/rGO nanocomposites. This is a promising candidate catalyst material for organic wastewater treatment.

Preparation and Photocatalytic Properties of Nanosized La3+ and Co2+ Co-Doped TiO2 by Microemulsions

2007 ◽  
Vol 336-338 ◽  
pp. 1943-1945
Author(s):  
Wei Liang Liu ◽  
Dan Li Lu ◽  
Chang Chun Ge ◽  
Jian Hua Chen ◽  
Zhi Ping He
Keyword(s):  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Visible Light ◽  
Specific Surface ◽  
Surface Area ◽  
Specific Surface Area ◽  
Uv Light ◽  
Pure Tio2 ◽  
Doped Tio2 ◽  
Co Doped

La3+ and Co2+ co-doped titania nanoparticles were prepared from reacting TiOSO4, La(NO3)3 and Co(NO3)2 with NH4OH in water/Triton X-100/n-hexanol/cyclohexane microemulsions. The structure, surface morphology and the specific surface area of the samples were characterized. The photocatalytic efficiency of as-prepared TiO2 was tested by photodegrading methyl orange. The results showed that doping with La3+ and Co2+ could suppress the growth of TiO2 grains and increase the specific surface area; When the calcination temperature increased from 300°C to 900°C, the average crystallite size of the particles increased from 7.3nm to 35.6 nm andthe specific surface area of the particles decreased rapidly from 205.5m2/g to 41.2m2/g. The synthesized amorphous particles wer transformed into anatase phase at 300°C, and further into rutile phase at 900°C. UV-Vis diffuse reflectance spectrum revealed that La3+ and Co2+ co-doped TiO2 absorbed UV light and visible light, while pure TiO2 could only absorb UV light. In the experiments of photodegrading methyl orange, it was proved that La3+ and Co2+ co-doped TiO2 had high photocatalytic activity under UV light and visible light, while pure TiO2 showed photocatalytic activity just under UV light.

Synthesis of rutile and anatase TiO2 nanoparticles from Ti-peroxy compound aqueous solution with polyols

2003 ◽  
Vol 18 (4) ◽  
pp. 797-803 ◽  
Author(s):  
Naofumi Uekawa ◽  
Miki Suzuki ◽  
Takahiro Ohmiya ◽  
Fumihiko Mori ◽  
Yong Jun Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Ethylene Glycol ◽  
Specific Surface ◽  
Tio2 Nanoparticles ◽  
Surface Area ◽  
Specific Surface Area ◽  
Single Phase ◽  
Anatase Tio2 ◽  
Oh Groups

Ti-peroxy compound was synthesized from Ti(O-iPr)4 and H2O2. Anatase and rutile TiO2 nanoparticles were prepared by heating the Ti-peroxy compound diluted with a polyol aqueous solution at 368 K for 24 h. In this research, ethylene glycol, glycerin, erythritol, and D-mannitol were used as polyols in the diluting solution. The ratio of anatase/rutile of the TiO2 obtained depended on the polyol concentration in the diluting solution. Furthermore, the polyol concentration at which single-phase anatase could be obtained was lowest when the number of OH groups in the polyol molecule was the highest. With increasing polyol concentration, the obtained TiO2 nanoparticles showed increasing specific surface area and decreasing particle size.

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