scholarly journals Tailoring Mesoporous Titania Features by Ultrasound-Assisted Sol-Gel Technique: Effect of Surfactant/Titania Precursor Weight Ratio

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1263
Author(s):  
Elvira Mahu ◽  
Cristina Giorgiana Coromelci ◽  
Doina Lutic ◽  
Iuliean Vasile Asaftei ◽  
Liviu Sacarescu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Weight Ratio ◽  
Soft Template ◽  
Synthesis Process ◽  
Mesoporous Titania ◽  
Cavitation Effect ◽  
Titania Precursor ◽  
Gel Technique ◽  
Ultrasound Assisted

A mesoporous titania structure has been prepared using the ultrasound-assisted sol-gel technique in order to find out a way to tailor its structure. The TiO2 obtained was compared to the same version of titania but synthesized by a conventional sol-gel method with the objective of understanding the effect of ultrasound in the synthesis process. All synthesis experiments were focused on the preparation of a titania photocatalyst. Thus, the anatase photocatalytic active phase of titania was proven by X-ray diffraction. Additionally, the ultrasonation treatment proved to increase the crystallinity of titania samples, being one of the requirements to having good photocatalytic activity for titania. The influence of surfactant/titania precursor weight ratio on the structural (XRD), textural (N2-sorption measurements), morphological (TEM), surface chemistry (FTIR) and optical properties (UVDR) was investigated. It was observed that the crystallite size, specific surface area, band gap energy and even photocatalytic activity was affected by the synergism occurring between cavitation effect and the surfactant/titania precursor weight ratio. The study yielded interesting great results that could be considered for further application of ultrasound to tailor mesoporous titania features via sol-gel soft template synthesis, against conventional sol-gel process.

Photocatalytic activity and selectivity of titania colloids and particles prepared by the sol-gel technique: photooxidation of phenol and atrazine

Langmuir ◽  
1993 ◽  
Vol 9 (11) ◽  
pp. 2995-3001 ◽  
Author(s):  
E. Pelizzetti ◽  
C. Minero ◽  
E. Borgarello ◽  
L. Tinucci ◽  
N. Serpone
Keyword(s):  
Photocatalytic Activity ◽  
Sol Gel ◽  
Gel Technique

scholarly journals Enhancement of Photocatalytic Activity by Mg2+ Doped Ceria Quantum Dots

2017 ◽  
Vol 2 (1) ◽  
Keyword(s):  
Quantum Dots ◽  
Photocatalytic Activity ◽  
Quantum Dot ◽  
Sol Gel ◽  
Lattice Parameter ◽  
Doped Ceria ◽  
X Ray Diffraction ◽  
X Ray ◽  
Gel Technique ◽  
Cubic Structure

The pure and Mg2+ doped CeO2 quantum dot were synthesized by sol-gel technique. The prepared quantum dots were characterized using X-ray diffraction pattern (XRD), Scanning electron microscope (SEM-EDX). The XRD results show cubic structure of the CeO2 quantum dots. The crystalline size (D), microstrain (ε), dislocation density (δ) and lattice parameter (α) were calculated and analyzed. SEM-EDX analysis shows the morphology and the presence of elements. The photocatalytic activity of the synthesized quantum dot was evaluated based on the photodegradation of methylene blue (MB) by UV-Vis spectrometry.

scholarly journals Surface-Plasmon-Induced Visible Light Photocatalytic Activity of Fe3O4/TiO2 Nanocomposite

2020 ◽  
Author(s):  
Narjes Esmaeili ◽  
Azadeh Ebrahimian Pirbazari ◽  
Ziba Khodaee
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Plasmon ◽  
Resonance Effect ◽  
Sol Gel ◽  
Analytical Techniques ◽  
Visible Light Photocatalytic Activity ◽  
Structure Morphology ◽  
Gel Technique ◽  
Visible Light Photocatalytic

In this research, first a binary nanocomposite of magnetic recyclable photocatalyst Fe3O4/TiO2, was synthesized by sol gel technique. Then, in order to enhance the photocatalytic activity of the synthesized nanocomposite, it was deposited by silver nanoparticles for using in degradation of organic pollutants 2, 4-dichlorophenol (2, 4-DCP) under visible light. A range of analytical techniques including XRD, FESEM/EDX, DRS, VSM and N2 physisorption were employed to reveal the crystal structure, morphology and property of the nanocomposites. We obtained 32% and 55% degradation of 2, 4-DCP under visible light after 180 min irradiation in the presence of Fe3O4/TiO2 and Fe3O4/TiO2/Ag respectively. Thus, the excellent visible light photocatalytic activity of Fe3O4/TiO2/Ag sample can be attributed to the surface plasmon resonance effect of Ag nanoparticles deposited on Fe3O4/TiO2 nanocomposite.

Synthesis of titanium dioxide by ultrasound assisted sol–gel technique: Effect of calcination and sonication time

2015 ◽  
Vol 23 ◽  
pp. 185-191 ◽  
Author(s):  
D.V. Pinjari ◽  
Krishnamurthy Prasad ◽  
P.R. Gogate ◽  
S.T. Mhaske ◽  
A.B. Pandit
Keyword(s):  
Titanium Dioxide ◽  
Sol Gel ◽  
Sonication Time ◽  
Technique Effect ◽  
Gel Technique ◽  
Ultrasound Assisted

Preparation and Photocatalytic Activity of Titania Pillared Montmorillonite Doped with Boron

2011 ◽  
Vol 233-235 ◽  
pp. 519-522
Author(s):  
Qiu Yan Zhang ◽  
Xiang Feng Guo ◽  
Li Hua Jia ◽  
Xue Ju Zhang
Keyword(s):  
Photocatalytic Activity ◽  
Photocatalytic Performance ◽  
Diffuse Reflection ◽  
Sol Gel ◽  
Boron Doping ◽  
Reflection Spectra ◽  
Visible Light Region ◽  
Pillared Montmorillonite ◽  
Light Region ◽  
Gel Technique

Boron doping titanium pillared montmorillonite (B-Ti-mont) were prepared by the sol-gel technique using sodic montmorillonite (Na-mont) as a substrate. Several technics such as XRD, SEM, UV-vis diffuse reflection spectra were used to characterize the samples. The results showed that all of the samples were of anatase, the absorption in the visible light region was strengthened after doped with boron. The basic skeleton of montmorillonite did not change after doping. The photocatalyst with the boron mole content of 5% displayed the best photocatalytic performance.

Photocatalytic degradation of indigo carmine by using tungsten doped bismuth vanadate

2021 ◽  
Vol 25 (7) ◽  
pp. 86-92
Author(s):  
Yasmin Ahmad ◽  
Suresh Ameta ◽  
Seema Kothari
Keyword(s):  
Photocatalytic Activity ◽  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Sol Gel ◽  
Indigo Carmine ◽  
Bismuth Vanadate ◽  
Photogenerated Electrons ◽  
Gel Technique ◽  
Indigo Carmine Dye

The photocatalytic degradation of indigo carmine dye was studied using tungsten doped BiVO4. Bismuth vanadate powder has been synthesized by sol-gel technique. The incorporation of W ions into BiVO4 was confirmed by EDX. The photocatalytic activity was studied using different samples of BiVO4 by variation of pH, concentration of dye, dose of semiconductor and light intensity. It has been found that degradation of dye is more effective in presence of W doped BiVO4, It shows the role of tungsten ions for enhancing degradation of indigo carmine by reducing the recombination of photogenerated electrons and holes.

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