Role of lanthanum species in improving the photocatalytic activity of titanium dioxide

2017 ◽  
Vol 7 (1) ◽  
pp. 159-167 ◽  
Author(s):  
Wai Ruu Siah ◽  
Hendrik O. Lintang ◽  
Leny Yuliati
Keyword(s):  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Charge Transfer ◽  
Uv Light ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Additional Formation

Lanthanum modification resulted in the additional formation of Ti3+ states, which enhanced the charge transfer and separation. Consequently, the photocatalytic activity of TiO2 under UV light irradiation was significantly improved.

Carbon-modified TiO2 as Photocatalysts

2010 ◽  
Vol 13 (3) ◽  
Author(s):  
Magdalena Janus ◽  
Antoni W. Morawski
Keyword(s):  
Carbon Dioxide ◽  
Titanium Dioxide ◽  
Advanced Oxidation Processes ◽  
Uv Light ◽  
Pure Titanium ◽  
Light Irradiation ◽  
Oxidation Processes ◽  
Uv Light Irradiation ◽  
Ultraviolet Light Irradiation ◽  
Long Time

AbstractPhotocatalysis belongs to one of the Advanced Oxidation Processes (AOP). These processes make possible the decomposition of organic compounds to carbon dioxide and water. The most useful photocatalyst is titanium dioxide which, to make it active, requires irradiation with suitable wavelengths. Pure titanium dioxide can be activated only by ultraviolet light irradiation (UV). For a long time, studies have been carried on modified titanium dioxide materials to obtain more effective photocatalysts with greater activity under UV light irradiation or to obtain photocatalysts which may be active also under visible light irradiation. One of the possible ways for modifying TiO

scholarly journals Photo-catalytic degradation of polyphenolic tannins in continuous-flow reactor using titanium dioxide immobilized on a cellulosic material

2020 ◽  
Vol 82 (7) ◽  
pp. 1454-1466
Author(s):  
Abdelhadi Jouali ◽  
Anas Salhi ◽  
Abdelkahhar Aguedach ◽  
El Kbir Lhadi ◽  
Mohammed El Krati ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Continuous Flow ◽  
Flow Reactor ◽  
Uv Light ◽  
Catalytic Degradation ◽  
Light Irradiation ◽  
Maximum Efficiency ◽  
Environmental Damage ◽  
Continuous Flow Reactor ◽  
Uv Light Irradiation

Abstract Tannins are recalcitrant polyphenolic molecules that resist microbial attack. Their main environmental damage is due to their low biodegradability. This work aims to investigate the photo-catalytic degradation of two commercial tannin extracts, chestnut (hydrolysable tannin) and mimosa (condensed tannin). The experiments were carried out under UV-light irradiation in a continuous-flow reactor using titanium dioxide (TiO2) immobilized on cellulosic fibers. It was highlighted that photo-catalytic degradation is unfavourable in acidic medium and when the pH is too high (pH above 12); it reaches its maximum efficiency at pH 7.5 (99 and 97% for chestnut and mimosa, respectively). Nearly complete degradation of tannins requires an irradiation period of 6 h. The process efficiency is inversely affected by the concentration of tannins essentially above 75 mg/L for chestnut and 60 mg/L for mimosa. Above 240 mL/min, any increase in feed flow negatively affects the performance of the process. Furthermore, a significant decrease of treatment efficiency was seen when increasing the concentration of ethanol and salts in the medium. Obtained results suggest that UV-light irradiation in a continuous-flow photo-reactor using immobilized TiO2 may be considered as an adequate process for the treatment of water containing recalcitrant tannin molecules.

Exploring the role of molecular chirality in the photo-responsiveness of dipeptide-based gels

2017 ◽  
Vol 5 (17) ◽  
pp. 3163-3171 ◽  
Author(s):  
Zhonghui Chen ◽  
Ziyu Lv ◽  
Guangyan Qing ◽  
Taolei Sun
Keyword(s):  
Uv Light ◽  
Light Irradiation ◽  
Molecular Chirality ◽  
Uv Light Irradiation

Chiral effect: upon UV light irradiation, the l-gel has a markedly faster gel–sol transition than the d-gel.

scholarly journals Role of the p53 homologue fromDrosophila melanogasterin the maintenance of histone H3 acetylation and response to UV-light irradiation

FEBS Letters ◽  
2006 ◽  
Vol 580 (2) ◽  
pp. 642-648 ◽  
Author(s):  
Eria Rebollar ◽  
Viviana Valadez-Graham ◽  
Martha Vázquez ◽  
Enrique Reynaud ◽  
Mario Zurita
Keyword(s):  
Uv Light ◽  
Histone H3 ◽  
Light Irradiation ◽  
Uv Light Irradiation ◽  
Histone H3 Acetylation ◽  
H3 Acetylation

Photocatalytic Activity of Bismuth Layered Perovskite Treated with Acid

2009 ◽  
Vol 421-422 ◽  
pp. 554-557
Author(s):  
Soihiro Watanabe ◽  
Yousuke Narumi ◽  
Kenji Toda ◽  
Tadashi Ishigaki ◽  
Kazuyoshi Uematsu ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Acid Treatment ◽  
Uv Light ◽  
High Photocatalytic Activity ◽  
Light Irradiation ◽  
Layered Perovskite ◽  
O2 Evolution ◽  
Water Decomposition ◽  
H2 Evolution ◽  
Uv Light Irradiation

We synthesized Sr0.7La0.2[ ]0.1Bi2Ta2O9 (SBTL , [ ] vacancy), and measured their photocatalytic activity for water decomposition under UV light irradiation after acid treatment. They showed the high photocatalytic activity under UV light irradiation (H2 evolution (213μmol / h) , O2 evolution (82μmol / h)).

Sign in / Sign up

Export Citation Format

Share Document