Photosensitization of Nitrogen Doped TiO2 Nanoparticles with Na-Chlorophyllin Copper for Degradation of Methyl Orange

2011 ◽  
Vol 343-344 ◽  
pp. 216-221
Author(s):  
Jian Yu Gong ◽  
Chang Zhu Yang ◽  
Wen Hong Pu ◽  
Jing Dong Zhang
Keyword(s):  
Methyl Orange ◽  
Visible Light ◽  
Light Illumination ◽  
Nitrogen Doped ◽  
Photoelectrocatalytic Degradation ◽  
Visible Light Illumination ◽  
Doped Titanium Dioxide ◽  
Degradation Properties ◽  
Degradation Of Methyl Orange ◽  
Nitrogen Doped Titanium Dioxide

Nitrogen doped titanium dioxide nanoparticals (N-TiO2) were prepared by the sol-hydrothermal method using urea as N sources. SEM showed the sphericity of as-prepared nanoparticals. XRD indicated that N-TiO2 was anatase crystal after thermal treatment. While Na-chlorophyllin copper (Na-chl-Cu) was used as to sensitize the N-TiO2, the photocurrent of Na-chl-Cu/N-TiO2 was 50 ìA double than that of N-TiO2 under visible light illumination. Thus, the visible light photoelectrocatalytic degradation properties of Na-chl-Cu/N-TiO2 were investigated using methyl orange (MO) as the objective pollution. When 1.8 V anodic bias potential and visible light were simultaneously applied, the highest degradation efficiency of MO over the Na-chl-Cu/N-TiO2 was obtained.

scholarly journals Visible-Light-Induced Bactericidal Activity of a Nitrogen-Doped Titanium Photocatalyst against Human Pathogens

2006 ◽  
Vol 72 (9) ◽  
pp. 6111-6116 ◽  
Author(s):  
Ming-Show Wong ◽  
Wen-Chen Chu ◽  
Der-Shan Sun ◽  
Hsuan-Shun Huang ◽  
Jiann-Hwa Chen ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Visible Light ◽  
Bactericidal Activity ◽  
Uv Light ◽  
Shigella Flexneri ◽  
Light Illumination ◽  
Human Pathogens ◽  
Carbon Doped ◽  
Nitrogen Doped ◽  
Visible Light Illumination

ABSTRACT The antibacterial activity of photocatalytic titanium dioxide (TiO2) substrates is induced primarily by UV light irradiation. Recently, nitrogen- and carbon-doped TiO2 substrates were shown to exhibit photocatalytic activities under visible-light illumination. Their antibacterial activity, however, remains to be quantified. In this study, we demonstrated that nitrogen-doped TiO2 substrates have superior visible-light-induced bactericidal activity against Escherichia coli compared to pure TiO2 and carbon-doped TiO2 substrates. We also found that protein- and light-absorbing contaminants partially reduce the bactericidal activity of nitrogen-doped TiO2 substrates due to their light-shielding effects. In the pathogen-killing experiment, a significantly higher proportion of all tested pathogens, including Shigella flexneri, Listeria monocytogenes, Vibrio parahaemolyticus, Staphylococcus aureus, Streptococcus pyogenes, and Acinetobacter baumannii, were killed by visible-light-illuminated nitrogen-doped TiO2 substrates than by pure TiO2 substrates. These findings suggest that nitrogen-doped TiO2 has potential application in the development of alternative disinfectants for environmental and medical usages.

Efficient visible-light induced photocatalysis on nanoporous nitrogen-doped titanium dioxide catalysts

2013 ◽  
Vol 228 ◽  
pp. 756-764 ◽  
Author(s):  
Hyun Uk Lee ◽  
Soon Chang Lee ◽  
Saehae Choi ◽  
Byoungchul Son ◽  
Sang Moon Lee ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Visible Light ◽  
Nitrogen Doped ◽  
Doped Titanium Dioxide ◽  
Nitrogen Doped Titanium Dioxide

Enhanced photocatalytic disinfection of microorganisms by transition-metal-ion-modification of nitrogen-doped titanium oxide

2010 ◽  
Vol 25 (1) ◽  
pp. 167-176 ◽  
Author(s):  
Qi Li ◽  
Pinggui Wu ◽  
Rongcai Xie ◽  
Jian Ku Shang
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Ion ◽  
Photocatalytic Performance ◽  
Light Illumination ◽  
Transition Metal Ion ◽  
Nitrogen Doped ◽  
Carrier Recombination ◽  
Visible Light Illumination ◽  
Charge Carrier Recombination

In this article, palladium modification and silver modification were used as examples to demonstrate the disinfection effects on microorganisms in aqueous environment of photocatalytic transition-metal-ion-modified nitrogen-doped titanium oxide (TiON/M) materials. Transition metal ion modification was applied to TiON to take advantage of the coupling between transition metal ion addition and TiON semiconductor matrix under visible light illumination. The coupling promotes the separation of electron and hole pairs produced by photon excitation, thus it could reduce the intrinsic charge carrier recombination from anion-doping, which largely limits the photoactivity of TiON under visible light illumination. Large enhancements on the hydroxyl radical production and the photocatalytic disinfection efficiency on microorganisms under visible light illumination were observed for TiON with both palladium and silver modifications. The superior photocatalytic performance under visible light illumination suggests that the transition metal ion modification is an effective approach to reduce the massive charge carrier recombination from anion-doping and to enhance the photocatalytic performance of anion-doped TiO2. The resulting photocatalytic materials have the potential for a wide range of environmental applications.

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