Effects of Hydrothermal Temperature on Crystallinity, Microstructure, and Photocatalytic Activity of Anatase TiO2 Mesocrystals

2016 ◽  
Vol 16 (11) ◽  
pp. 11153-11157 ◽  
Author(s):  
Tae Yang Seo ◽  
Seung Muk Lee ◽  
Jun Hyuk Choi ◽  
Chang Min Lee ◽  
Geun Chul Park ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Hydrothermal Temperature

The effect of hydrothermal temperature on the structure and photocatalytic activity of {001} faceted anatase TiO2

2015 ◽  
Vol 160 ◽  
pp. 231-234 ◽  
Author(s):  
Wei Wang ◽  
Yingjie Zhou ◽  
Chunhua Lu ◽  
Yaru Ni ◽  
Weifeng Rao
Keyword(s):  
Photocatalytic Activity ◽  
Anatase Tio2 ◽  
Hydrothermal Temperature

First-Principles Study on Electronic and Optical Properties in Pr-Doped Anatase TiO2

2014 ◽  
Vol 924 ◽  
pp. 260-268 ◽  
Author(s):  
Hao Chen ◽  
Lan Fang Yao ◽  
Song Lin Yang ◽  
Ya Qin Wang ◽  
Xing Liang ◽  
...  
Keyword(s):  
Optical Properties ◽  
Photocatalytic Activity ◽  
First Principles ◽  
Energy Gap ◽  
Impurity Band ◽  
Anatase Tio2 ◽  
Electron Hole ◽  
Light Region ◽  
Overlap Population ◽  
Calculation Results

The crystal structures, band structures, density of states, charge density, overlap population and optical properties of pure anatase TiO2 and Pr-doped anatase TiO2 were studied by using the plane-wave pseudopotential method based on the first-principles. After Pr doping, the valence band and the conduction band moved down and became dense, energy gap became narrow and a impurity band which consists of Pr 4f states appeared. And the dipole moment got improved, which is good for the separate of the electron-hole pairs. These effectively overcome two huge shortcomings of TiO2. Besides, Pr-doped anatase TiO2 produced more carriers which have good transport properties and the absorption spectra of Pr-O bond appear in the region that the wavelength is longer. The calculation results of optical properties show that the absorption edge occured red shift, which means the photocatalytic activity of anatase TiO2 got remarkable improved during visible-light region. This conforms to the previous analysis. So the photocatalytic activity of anatase TiO2 got remarkable improved after Pr doping.

scholarly journals Preliminary Study on Effect of Hydrothermal Temperature during TiO2 Synthesis on the Biodiesel Production from Waste Cooking Oil

2021 ◽  
Vol 50 (6) ◽  
pp. 1685-1695
Author(s):  
Nurashina Abdul Rahman ◽  
Anita Ramli ◽  
Chong Fai Kait
Keyword(s):  
Photocatalytic Activity ◽  
Acid Methyl Ester ◽  
Textural Properties ◽  
Rutile Phase ◽  
Waste Cooking Oil ◽  
Biodiesel Production ◽  
Hydrothermal Temperature ◽  
Titanium Butoxide ◽  
Cooking Oil ◽  
Type Iv

In the present work, effect of hydrothermal temperature from 120 to 160 °C on TiO2 physicochemical properties as well as its photocatalytic activity towards biodiesel production using waste cooking oil (WCO) was investigated. TiO2was synthesized via hydrothermal method using Titanium butoxide, Ti(OBu)4 as the precursor and nitric acid, HNO3 as the peptizing agent. Next, the synthesized photocatalyst was dried at 60 °C for 24 h and later calcined at 400 °Cfor 2 h. The synthesized TiO2 was characterized using X-ray diffraction (XRD) and Burnauer- Emmet- Teller (BET) to determine their crystallinity and textural properties. Results showed that all synthesized TiO2 have a mixture of anatase and rutile phase and N2 adsorption- desorption isotherm for all catalyst possess Type IV isotherm according to IUPACclassification with hysteresis loop of type H1. Then, all the synthesized catalysts were tested for biodiesel production using esterified waste cooking oil under visible light irradiation for 1 h and 10 min. Percentage of fatty acid methyl ester (FAMEs) present in the synthesized biodiesel was determined using gas chromatography with flame ionization detector (GC-FID). The synthesized catalyst (T24_160) showed a good photocatalytic activity as the percentage of biodiesel yield was higher (3.41%) compared to the other catalyst.

scholarly journals Enhanced photocatalytic bacterial inactivation of atomic-layer deposited anatase-TiO2 thin films on rutile-TiO2 nanotubes

2020 ◽  
Vol 19 (3) ◽  
pp. 399-405
Author(s):  
Joel Molina-Reyes ◽  
Alejandra Romero-Morán ◽  
José L. Sánchez-Salas
Keyword(s):  
Thin Films ◽  
Photocatalytic Activity ◽  
Tio2 Nanotubes ◽  
Considerable Increase ◽  
Atomic Layer ◽  
Surface Modifications ◽  
Anatase Tio2 ◽  
Bacterial Inactivation ◽  
Tio2 Thin Films ◽  
Experimental Conditions

Experimental conditions to fabricate rutile-TiO2 nanotubes coated with a conformal anatase-TiO2 thin layer using ALD were reported. A considerable increase in the photocatalytic activity associated with these surface modifications was also observed.

scholarly journals Tuning the Morphological Structure and Photocatalytic Activity of Nitrogen-Doped (BiO)2CO3by the Hydrothermal Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Chongjun Wang ◽  
Zaiwang Zhao ◽  
Bin Luo ◽  
Min Fu ◽  
Fan Dong
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Light Absorption ◽  
Photocatalytic Performance ◽  
Morphological Structure ◽  
Hydrothermal Temperature ◽  
Nitrogen Doped ◽  
Light Region ◽  
Efficient Performance ◽  
One Step

Various nitrogen-doped hierarchical (BiO)2CO3nanosheets architectures were synthesized by a facile one-step template-free hydrothermal method through controlling the hydrothermal temperature (HT). The as-synthesized samples were characterized by XRD, SEM, FT-IR, XPS, and UV-vis DRS. The photocatalytic activity of the samples was evaluated towards degradation of NO at ppb level in air under visible light (VIL). It was found that HT acted as a crucial factor in determining the morphology of the samples. The rosa chinensis-like, red camellia-like, and lamina-like of nitrogen-doped (BiO)2CO3(N-BOC) micro-/nanostructures can be selectively fabricated under hydrothermal temperatures of 150, 180, and 210°C. The thickness of the nanosheets was in direct proportion to the increasing HT. Nitrogen-doping can extend the light absorption spectra of (BiO)3CO3to visible light region and enhance the VIL photocatalytic activity. Especially, the red camellia-like N-BOC-180 exhibited the highest photocatalytic performance, superior to the well-known VIL-driven photocatalyst C-doped TiO2and N-doped TiO2. The high photocatalytic performance of N-BOC was attributed to the synergetic effects of enhanced visible light absorption, multiple light-reflections between the nanosheets, and accelerated transfer of reactants and product. This research could provide new insights to the development of excellent photocatalyst with efficient performance for pollution control.

Sign in / Sign up

Export Citation Format

Share Document