scholarly journals The Cerium/Boron Insertion Impact in Anatase Nano-structures on the Photo-Electrochemical and Photocatalytic Response

Surfaces ◽  
2021 ◽  
Vol 4 (1) ◽  
pp. 54-65
Author(s):  
Aurora A. Flores-Caballero ◽  
Arturo Manzo-Robledo ◽  
Nicolas Alonso-Vante
Keyword(s):  
Sol Gel ◽  
Surface States ◽  
X Ray Diffraction ◽  
Boron Doped ◽  
Nano Structures ◽  
Titania Surface ◽  
Boron Ions ◽  
Doped Titania ◽  
Photogenerated Charge Separation ◽  
Substitutional Effect

Boron- and cerium-doped titania (Anatase) were prepared via sol-gel method. Phase composition and morphology were assessed by X-ray diffraction (XRD), scanning electronic microscopy (SEM), BET, diffuse reflectance spectra (DRS), and XPS. Photo-electrochemistry of these materials, deposited onto fluorine-doped SnO2 (FTO), was investigated in acid and acid-containing methanol. The boron-doped sample showed the best opto-electronic properties among the investigated samples. On the other hand, the cerium-doped titania samples annihilate to a certain extent the titania surface states, however, photogenerated charge separation was limited, and certainly associated to surface Ce3+/Ce4+ species. The substitutional effect of boron ions for O sites and interstitial sites was confirmed by XRD and XPS analyses.

Visible-Light-Induced Photocatalytic Activity of Boron-Doped BiVO4

2014 ◽  
Vol 809-810 ◽  
pp. 890-894
Author(s):  
Dan Li ◽  
Lian Wei Shan ◽  
Gui Lin Wang ◽  
Li Min Dong ◽  
Wei Li ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Diffuse Reflectance ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Reflectance Spectroscopy ◽  
Scheelite Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Boron Doped

Boron-BiVO4 samples were synthesized by sol-gel method. They were characterized by UV-vis diffuse reflectance spectroscopy, X-ray diffraction. Photocatalytic activity of the obtained BiVO4 samples was investigated through degrading methylene blue (MB). The results reveal that boron-BiVO4 catalysts have monoclinic scheelite structure. The BiVO4 and Co-BiVO4 photocatalysts were responsive to visible light. Co-BiVO4 photocatalyst showed higher photocatalytic activity than pure BiVO4, resulting in the significantly improved efficiency of degradation of MB.

scholarly journals Synthesis Photocatalytic and Antibacterial Activities of Nickle Doped Tio2 Nanoparticles

2018 ◽  
Vol 34 (6) ◽  
pp. 3140-3144
Author(s):  
Ritu Vershney ◽  
Komal Chelaramani ◽  
Arpan Bhardwaj ◽  
Nayma Siddiqui ◽  
Suresh Kumar Verma
Keyword(s):  
Photocatalytic Degradation ◽  
Tio2 Nanoparticles ◽  
Sol Gel ◽  
Antibacterial Activities ◽  
X Ray Diffraction ◽  
Zone Of Inhibition ◽  
Time Duration ◽  
X Ray ◽  
Gel Technique ◽  
Doped Titania

The synthesis of Ni doped titania (TiO2) nanoparticles were achieved via simple novel sol gel technique, in which Titanium-n-butoxide and NiCl2 were taken as precursors. Effect of different wt% of dopant in TiO2 was studied on photocatalytic degradation of Aniline blue and Toluidine Blue. The study suggested the increased photocatalytic degradation with increased time duration. The synthesized samples were analyzed by surface electron microscopy (SEM) and X-ray diffraction studies. The antibacterial activity was investigated against Gram-positive Staphylococcus aureus bacteriae. Studies revealed that on increasing the dopant concentration, the diameter of zone of inhibition also increased upto 1.5 wt%.

HIGHLY HOMOGENEOUS NITROGEN DOPED TITANIA NANOMATERIALS: SYNTHESIS AND CHARACTERIZATION

2016 ◽  
Vol 78 (6-12) ◽  
Author(s):  
Nurul Diyana Zainal ◽  
Hadi Nur ◽  
Siew Ling Lee
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Ammonium Hydroxide ◽  
Homogeneous Distribution ◽  
X Ray Diffraction ◽  
Nitrogen Doped ◽  
Mapping Analysis ◽  
N Doping ◽  
Nanomaterials Synthesis ◽  
Doped Titania

A series of nitrogen doped titania nanomaterials were synthesized via sol-gel method by using tetraethyl ammonium hydroxide as N source. Doping of N into TiO2 was confirmed via X-ray diffraction (XRD) and fourier transform infrared spectroscopy (FTIR) analyses. Mixture of anatase and rutile phases appeared in the unmodified TiO2 which was calcined at 773 K. The addition of N to TiO2 matrix led to formation of single phase of anatase. It has been demonstrated thatTiO2 and all the N-doped TiO2 materials were in nanoscale ranging 15.91 – 20.82 nm. Change in surface morphology after N doping was detected by field emission scanning electron microscope (FESEM). Results of EDX mapping analysis indicated homogeneous distribution of N dopants.

RAMAN STUDY OF VANADIUM-DOPED TITANIA NANOPOWDERS SYNTHESIZED BY SOL-GEL METHOD

2010 ◽  
Vol 24 (06n07) ◽  
pp. 667-675 ◽  
Author(s):  
M. ŠĆEPANOVIĆ ◽  
S. AŠKRABIĆ ◽  
M. GRUJIĆ-BROJČIN ◽  
A. GOLUBOVIĆ ◽  
Z. DOHČEVIĆ-MITROVIĆ ◽  
...  
Keyword(s):  
Raman Spectra ◽  
Structural Characteristics ◽  
Anatase Phase ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Gel Method ◽  
Sol Gel Method ◽  
Synthesis Conditions ◽  
Raman Modes ◽  
Doped Titania

Pure titania ( TiO 2) nanopowders and TiO 2 doped with 10 mol % of vanadium ions ( V 3+) are synthesized by sol-gel method. The dependence of structural characteristics of nanopowders on synthesis conditions is investigated by X-ray diffraction and Raman spectroscopy. Very intensive modes observed in Raman spectra of all nanopowders are assigned to anatase phase of TiO 2. Additional Raman modes of extremely low intensity which can be related to the presence of small amount of brookite amorphous phase are observed in pure TiO 2 nanopowders. In V -doped nanopowders anatase was the only TiO 2 phase detected. The variations in duration and heating rate of calcination influence slightly the Raman spectra of pure TiO 2, but have a great impact on Raman modes of anatase, as well as the additional Raman modes related to the presence of vanadium oxides in V -doped samples.

Characterizations and Crystal Structure of Er Ions Doped Titania Nanofibers

2012 ◽  
Vol 468-471 ◽  
pp. 294-297
Author(s):  
Ying Lu ◽  
Jin Zhong Hong ◽  
Chang Lu Shao ◽  
Xin Zhang ◽  
Ming Xing Lv ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Composite Nanofibers ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
X Ray ◽  
Novel Method ◽  
Doped Titania ◽  
Er Doped ◽  
Scanning Electron ◽  
Titania Nanofibers

A simple and novel method to synthesize Er ion doped titania was investigated. In this work, Er-doped titania nanofibers were prepared by the sol-gel method. Characterizations of the nanofibers were done by X-ray diffraction, scanning electron microscopy. The results suggest that crystal structures of Er-doped titania composite nanofibers were changed due to Er ions disturbing.

Effects of Boron-Doped on Photocatalysis and Hydrophilicity of TiO2 Film

2007 ◽  
Vol 336-338 ◽  
pp. 1924-1926 ◽  
Author(s):  
Hong Li ◽  
Gao Ling Zhao ◽  
Gang Xu ◽  
Gao Rong Han
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Sol Gel ◽  
Tio2 Films ◽  
X Ray Diffraction ◽  
Tio2 Thin Films ◽  
X Ray ◽  
Glass Substrates ◽  
Atomic Force ◽  
Boron Doped

In order to investigate the effects of doping boron on the self-cleaning properties of TiO2 thin films, sol-gel method was employed to prepare TiO2 films with various amount of boron on the glass substrates. Atomic Force Microscope (AFM) and X-ray diffraction (XRD) were carried out to investigate the effects of boron on the microstructure and crystallization behavior of the thin films. The photocatalytic activity and the hydrophilicity of the films were also measured. The results showed that the photocatalytic activity of TiO2 films was improved by doping boron, and its hydrophilicity wasn’t destroyed. This can be ascribed to the enhancement of the surface energy, which was caused by the reduction of the crystal grain size of TiO2.

scholarly journals Zinc-Doped Titania Embedded on the Surface of Zirconia: A Potential Visible-Responsive Photocatalyst Material

2020 ◽  
Vol 20 (6) ◽  
pp. 1374
Author(s):  
Azizia Alifi ◽  
Rian Kurniawan ◽  
Akhmad Syoufian
Keyword(s):  
Sol Gel ◽  
Diffraction Method ◽  
Reflectance Spectroscopy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcination Temperatures ◽  
Zinc Doping ◽  
Doped Titania ◽  
Scanning Electron

The preparation and characterization of zirconia-supported titania with a zinc dopant had been studied. Zinc-doped titania was grown on the surface of zirconia by the sol-gel method. Various zinc contents and calcination temperatures were applied to investigate the zinc doping effect and crystal structure of the zirconia-titania composite. X-ray diffraction method, Fourier-transform infrared spectroscopy, and UV-Vis reflectance spectroscopy were performed to characterize the composite. The morphology of the composite was observed by using a scanning electron microscope, and its composition was analyzed by using energy dispersive spectroscopy. Among various zinc dopant contents and calcination temperatures investigated, doping with 5% zinc (Zn wt./Ti wt.) at 900 °C calcination shows the best result in response to visible light with a bandgap of 2.87 eV and absorption edge wavelength of 432.61 nm.

scholarly journals Modification of TiO2 nanoparticles through lanthanum doping and peg templating

2014 ◽  
Vol 8 (4) ◽  
pp. 195-202 ◽  
Author(s):  
Marija Milanovic ◽  
Ljubica Nikolic
Keyword(s):  
Anatase Phase ◽  
Sol Gel ◽  
Nitrogen Adsorption ◽  
Sem Analysis ◽  
X Ray Diffraction ◽  
Average Pore ◽  
Lanthanum Doping ◽  
X Ray ◽  
Doped Titania ◽  
Adsorption Desorption

Pure and lanthanum doped titania nanopowders were synthesized through a room temperature sol-gel method using a template of polyethylene glycol (PEG). The progress of the synthesis in terms of phase formation and size of nanoparticles was monitored by X-ray diffraction, FTIR spectroscopy and SEM analysis. After calcination at 450?C in air, the results have shown the presence of small particles crystallized predominantly in the form of anatase phase, with significant agglomeration. Nitrogen adsorption-desorption measurements confirmed that all prepared powders are mesoporous with an average pore diameter in range 3.1-3.8 nm. The addition of lanthanum ions leads to the nanopowders with the highest specific surface (BET) area (203m2/g). The obtained powders were compared to TiO2 prepared without a template.

Effect of W doping level on TiO2 on the photocatalytic degradation of Diuron

2016 ◽  
Vol 75 (1) ◽  
pp. 20-27 ◽  
Author(s):  
Ghania Foura ◽  
Ahcène Soualah ◽  
Didier Robert
Keyword(s):  
Visible Light ◽  
Separation Efficiency ◽  
Diffuse Reflectance Spectroscopy ◽  
Sol Gel ◽  
Pure Tio2 ◽  
Solar Light ◽  
X Ray Diffraction ◽  
Simulated Solar Light ◽  
Uv Visible ◽  
Doped Titania

In the present study, three compositions of W-doped titania nano-photocatalyst are synthesized via the sol–gel method. The powders obtained were characterized by X-ray diffraction, Raman spectroscopy and UV–visible diffuse reflectance spectroscopy. The photocatalytic performances of the different photocatalysts are tested with respect to the degradation of Diuron in water solutions under simulated solar light and visible light irradiation. The W0.03Ti0.97O2 catalyst exhibits better photoactivity than the pure TiO2 even under simulated solar light and visible light. This improvement in activity was attributed to photoelectron/hole separation efficiency.

scholarly journals Effect of the Amount of Water in the Synthesis of B-TiO2: Orange II Photodegradation

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
M. May-Lozano ◽  
G. M. Ramos-Reyes ◽  
R. López-Medina ◽  
S. A. Martínez-Delgadillo ◽  
J. Flores-Moreno ◽  
...  
Keyword(s):  
Surface Area ◽  
Sol Gel ◽  
Rutile Phase ◽  
Band Gap Energy ◽  
Molar Ratio ◽  
Orange Ii ◽  
X Ray Diffraction ◽  
X Ray ◽  
Boron Doped ◽  
Excess Water

A series of boron-doped TiO2 photocatalysts (2% B-TiO2) with different water/alkoxide molar ratio were synthesized by conventional sol-gel method. The prepared samples were characterized by BET measurement, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIRS), and diffuse-reflectance UV-vis. The phase anatase was present, but unexpectedly a small amount of rutile phase was formed with low and excess water in the synthesis. Additionally it has been observed that the increase in the molar ratio of water significantly increases the values of band gap energy and the specific surface area. Results showed that degradation of Orange II azo dye increases with surface area, particle size, boron, and water content in photocatalysis. The boron species were introduced in the tricoordinated form.

Sign in / Sign up

Export Citation Format

Share Document