Influence of thermal treatment and Au-loading on the growth of versatile crystal phase composition and photocatalytic activity of sodium titanate nanotubes

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51342-51348 ◽  
Author(s):  
Inderpreet Singh Grover ◽  
Satnam Singh ◽  
Bonamali Pal
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Phase Composition ◽  
Thermal Treatment ◽  
Sodium Titanate ◽  
Titanate Nanotubes ◽  
Crystal Phase ◽  
Notable Change ◽  
Structure Morphology ◽  
Titanate Nanostructures

A coalescence influence of Au-loading followed by calcination at 800 °C led to a notable change in crystal-structure, morphology, phase composition and photocatalytic activity of titanate-nanostructures.

scholarly journals Effects of Annealing Temperature on the Crystal Structure, Morphology, and Optical Properties of Peroxo-Titanate Nanotubes Prepared by Peroxo-Titanium Complex Ion

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1331 ◽  
Author(s):  
Hyunsu Park ◽  
Tomoyo Goto ◽  
Sunghun Cho ◽  
Soo Wohn Lee ◽  
Masato Kakihana ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Precursor Solution ◽  
Titanate Nanotubes ◽  
Layered Compound ◽  
Alkali Concentration ◽  
Complex Ions ◽  
Nanotubular Structure ◽  
Structure Morphology ◽  
Hydrogen Titanate

This study addresses the effects of annealing temperatures (up to 500 °C) on the crystal structure, morphology, and optical properties of peroxo groups (–O–O–) containing titanate nanotubes (PTNTs). PTNTs, which possess a unique tubular morphology of layered-compound-like hydrogen titanate structure (approximately 10 nm in diameter), were synthesized using peroxo-titanium (Ti–O–O) complex ions as a precursor under very mild conditions—temperature of 100 °C and alkali concentration of 1.5 M—in the precursor solution. The nanotubular structure was dismantled by annealing and a nanoplate-like structure within the range of 20–50 nm in width and 100–300 nm in length was formed at 500 °C via a nanosheet structure by decreasing the specific surface area. Hydrogen titanate-based structures of the as-synthesized PTNTs transformed directly into anatase-type TiO2 at a temperature above 360 °C due to dehydration and phase transition. The final product, anatase-based titania nanoplate, was partially hydrogen titanate crystal in nature, in which hydroxyl (–OH) bonds exist in their interlayers. Therefore, the use of Ti–O–O complex ions contributes to the improved thermal stability of hydrogen titanate nanotubes. These results show a simple and environmentally friendly method that is useful for the synthesis of functional nanomaterials for applications in various fields.

scholarly journals Hydrazine and Urea Fueled-Solution Combustion Method for Bi2O3 Synthesis: Characterization of Physicochemical Properties and Photocatalytic Activity

2019 ◽  
Vol 15 (1) ◽  
pp. 104-111 ◽  
Author(s):  
Yayuk Astuti ◽  
Prisca Putri Elesta ◽  
Didik Setyo Widodo ◽  
Hendri Widiyandari ◽  
Ratna Balgis
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Bismuth Oxide ◽  
Rhodamine B ◽  
Combustion Method ◽  
High Photocatalytic Activity ◽  
Synthesis Process ◽  
Solution Combustion ◽  
Solution Combustion Method ◽  
Structure Morphology

Bismuth oxide synthesis using solution combustion method fuelled by hydrazine and urea has been conducted. This study aims to examine the effect of the applied fuels, urea and hydrazine, on product characteristics and photocatalytic activity in degrading rhodamine B dye. Bismuth oxide synthesis was initiated by dissolving bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) in a nitric acid solvent. Fuel was added and then stirred. The solution formed was heated at 300 ºC for 8 hours. The product obtained was then calcined at 700 ºC for 4 hours. Bismuth oxide synthesized with urea (BO1) and hydrazine (BO2) as fuels both obtained form of yellow powder. The formation of bismuth oxide is indicated by the vibrations of the Bi–O–Bi and Bi–O groups and the crystal structure of a-Bi2O3 in both products. Photocatalytic activity test showed that BO1 has a photocatalyst activity in degrading rhodamine B higher than that of BO2 with constant values of  3.83×10-5 s-1 and 3.43×10-5 s-1, respectively. The high photocatalytic activity can be examined through several factors, such as: band gap values, crystal structure, morphology, and surface area, acquired as a result of the use of different fuels in the synthesis process. Copyright © 2020 BCREC Group. All rights reserved 

scholarly journals Role of Na+ ion removal on the photocatalytic properties of hydrothermally-prepared nanotubes TiO2

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Naimat Abimbola Eleburuike ◽  
Wan Azelee Wan Abu Bakar ◽  
Rusmidah Ali
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Annealing Temperature ◽  
Poor Performance ◽  
Sodium Titanate ◽  
High Photocatalytic Activity ◽  
Photocatalytic Properties ◽  
Ion Content ◽  
Na Ions

Nanostructured TiO2 enjoys wide patronage for the remediation of water sources that have been contaminated with organic pollutants due to its excellent photocatalytic properties. This study investigated the role of removal of Na+ ions from hydrothermally-prepared TiO2 nanotubes (TNTs) by washing with dilute hydrochloric acid. The photocatalytic activity of TNTs was tested on the degradation of modelled paraquat dichloride-contaminated water. It was found that the amount of residual Na+ ions after acid washing greatly influenced the photocatalytic properties of TNTs. The Na+ ions had significant effect on the crystal structure of TNTs and the crystal structure varied with the annealing temperature. Hence, the effect of the residual Na+ ions was observed at different annealing temperatures of 500, 700 and 800 °C. It was discovered that TNTs containing negligible Na+ ions demonstrated high photocatalytic activity at 500 °C annealing temperature because it consisted of active crystalline anatase species at this temperature. On the other hand, TNTs with high Na+ ion content showed poor performance at 500 °C due to the presence of amorphous sodium titanate species which could result in rapid electron-hole pair recombination. So, it showed highest photocatalytic activity at 800 °C when the crystallinity had increased. Generally, it can be concluded that TNTs with negligible Na+ ion content demonstrated excellent photocatalytic activity by achieving 77.1% degradation of paraquat dichloride compared to those with high Na+ ion content which achieved 61.1% degradation of paraquat dichloride within 5 h.

scholarly journals Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide

2017 ◽  
Vol 12 (3) ◽  
pp. 478 ◽  
Author(s):  
Yayuk Astuti ◽  
Arnelli Arnelli ◽  
Pardoyo Pardoyo ◽  
Amilia Fauziyah ◽  
Siti Nurhayati ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Methyl Orange ◽  
Bismuth Oxide ◽  
Precipitation Method ◽  
Structure Degradation ◽  
Structure Morphology ◽  
Morphological Differences ◽  
The One ◽  
Degradation Of Methyl Orange

Bismuth oxide (Bi2O3) is a well-studied photocatalyst for degradation of various environmental contaminants. In this research Bi2O3 has been synthesized by precipitation method using two different bases (NH4OH and NaOH). The samples thus obtained were then analyzed using FTIR, XRD, and SEM for surface functionalization, crystal structures and morphological differences, respectively. The Bi2O3 precipitated using NH4OH showed a flower like structure made up of individual plates having α-Bi2O3 crystal structure. The precipitate obtained using NaOH showed a honeycomb like flower structure with a mixture of both α-Bi2O3 and γ-Bi2O3 crystal structure. Degradation of methyl orange (MO) was used as a model system to test the photocatalytic activity of the bismuth oxide. The Bi2O3 synthesized using NH4OH showed superior photocatalytic degradation of methyl orange than the one synthesized using NaOH. Copyright © 2017 BCREC Group. All rights reservedReceived: 12nd April 2017; Revised: 24th June 2017; Accepted: 12nd July 2017; Available online: 27th October 2017; Published regularly: December 2017How to Cite: Astuti, Y., Arnelli, Pardoyo, Fauziyah, A., Nurhayati, S., Wulansari, A.D., Andianingrum, R., Widiyandari, H., Bhaduri, G.A. (2017). Studying Impact of Different Precipitating Agents on Crystal Structure, Morphology and Photocatalytic Activity of Bismuth Oxide. Bulletin of Chemical Reaction Engineering & Catalysis, 12 (3): 478-484 (doi:10.9767/bcrec.12.3.1144.478-484) 

Biomorphic SnO2/C Ceramics Derived from Bio-Templates

2011 ◽  
Vol 197-198 ◽  
pp. 105-108
Author(s):  
Xin Hai He ◽  
Jun Bo Wang ◽  
Xiao Lei Su ◽  
Chong Fu ◽  
Jie Xu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Phase Composition ◽  
Carbothermal Reduction ◽  
Sintering Temperature ◽  
Carbonization Temperature ◽  
The Other ◽  
Amorphous Form ◽  
Structure Morphology ◽  
Ramie Fibers

Biomorphic SnO2/C ceramic has been prepared by molding into a composite billet and carbothermal-reduction under vacuum from ramie fibers/Sn(OH)4 precursors. The phase composition and microstructure of the prepared samples were characterized. The effects of the carbonization temperature and the other factors on the crystal structure, morphology and ingredients of the prepared samples were discussed. The results showed that there is no peak corresponding to carbon. So, it is inferred that the carbon exists in amorphous form and the sintering temperature have significant effects on the microstructure of SnO2 in biomorphic SnO2/C ceramics. The prepared products at the sintering temperature between 480°C and 630°C are biomorphic SnO2/C ceramics.

scholarly journals Influences of Silver-Doping on the Crystal Structure, Morphology and Photocatalytic Activity of TiO<sub>2</sub> Nanofibers

2011 ◽  
Vol 02 (09) ◽  
pp. 1188-1193 ◽  
Author(s):  
Nasser A. M. Barakat ◽  
Muzafar A. Kanjwal ◽  
Salem S. Al-Deyab ◽  
Ioannis S. Chronakis
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Silver Doping ◽  
Structure Morphology

Crystal structure, morphology and photocatalytic activity of modified TiO2 and of spray-deposited TiO2 films

2010 ◽  
Vol 151 (1-2) ◽  
pp. 14-20 ◽  
Author(s):  
M. Uzunova-Bujnova ◽  
R. Kralchevska ◽  
M. Milanova ◽  
R. Todorovska ◽  
D. Hristov ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Photocatalytic Activity ◽  
Tio2 Films ◽  
Structure Morphology
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