scholarly journals The Effect of Nitrogen-Doped ATO Nanotubes on Radical Multiplication of Buffer Media by Visible Light Photocatalysis Rather UV

2012 ◽  
Vol 2012 ◽  
pp. 1-6
Author(s):  
Kan-Hung Hu ◽  
Shing-Hoa Wang ◽  
Todd Hsu ◽  
Chien-Chon Chen ◽  
Tai-Yuan Lin ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Free Radical ◽  
Visible Light ◽  
Hydroxyl Radicals ◽  
Superoxide Radical ◽  
Uv Light ◽  
Visible Light Photocatalysis ◽  
Radical Anions ◽  
Buffer Solution ◽  
Nitrogen Doped

The use of TiO2in photodynamic therapy for the treatment of cancer has generally been studied in cultured cancer cells in serum-containing RPMI 1640 medium under visible light application rather than ultraviolet (UV) light. An ordered channel array of N-doped anodic titanium dioxide (ATO) has been successfully made for visible light application. ATO nanotubes in the anatase form with a length of 10μm are more effective than nanotubes of 1.8 μm in length as a photocatalyst for radical multiplication in buffer solution by generating hydroxyl radicals and superoxide radical anions under UV-A exposure. Only the N-doped ATO is applicable to visible light photocatalysis for radical multiplication in RPMI1640+1% FBS and acrylamide, a free radical carrier.

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.

Visible-light photocatalysis of nitrogen-doped TiO2 nanoparticulate films prepared by low-energy ion implantation

2007 ◽  
Vol 253 (17) ◽  
pp. 7024-7028 ◽  
Author(s):  
Hong Shen ◽  
Lan Mi ◽  
Peng Xu ◽  
Weidian Shen ◽  
Pei-Nan Wang
Keyword(s):  
Ion Implantation ◽  
Visible Light ◽  
Low Energy ◽  
Visible Light Photocatalysis ◽  
Doped Tio2 ◽  
Nitrogen Doped

scholarly journals Fabrication of La2O3/g-C3N4 Heterojunction with Enhanced Photocatalytic Performance of Tetracycline Hydrochloride

Crystals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1349
Author(s):  
Zhengru Zhu ◽  
Haiwen Xia ◽  
Rina Wu ◽  
Yongqiang Cao ◽  
Hong Li
Keyword(s):  
Hydroxyl Radicals ◽  
Degradation Rate ◽  
Photocatalytic Performance ◽  
Superoxide Radical ◽  
Active Species ◽  
Tetracycline Hydrochloride ◽  
Radical Anions ◽  
Photocatalytic Process ◽  
Composite Photocatalysts ◽  
Ultrasound Assisted

In this study, La2O3/g-C3N4 heterojunction photocatalysts doped with different dosages of La2O3 were constructed by a facile ultrasound-assisted calcination approach. The as-prepared photocatalysts were characterized by XRD, FTIR, FESEM, TEM, XPS, PL and DRS to verify the composite photocatalysts’ purity and to investigate their structural, morphological and elemental composition, and their energy band. According to the results, a type of pure rod–sheet-shaped, heterostructured nanoparticle was successfully obtained. Decorated with 10% La2O3, 2 g/L of the composite sample had a 93% degradation rate for 20 mg/L tetracycline hydrochloride within 2 h under visible light at a pH of 7. After four successive photocatalytic runs, satisfactory stability and reusability was exhibited, with 70% of the tetracycline hydrochloride being removed in the final experiment. Electrons (e−), photogenerated holes (h+), superoxide radical anions (O2−) and hydroxyl radicals (OH) were the fundamental active species during the photocatalytic process and were investigated via quenching experiments. Furthermore, possible photocatalytic mechanisms were analyzed in this work.

scholarly journals Organic-Photoacid-Catalyzed Glycosylation

Synlett ◽  
2020 ◽  
Vol 31 (09) ◽  
pp. 823-828
Author(s):  
Ting Wang ◽  
Juncheng Li ◽  
Gaoyuan Zhao
Keyword(s):  
Photodynamic Therapy ◽  
Visible Light ◽  
Organic Synthesis ◽  
Uv Light ◽  
Molecular Switching ◽  
Absorption Of Light

Photoacids are molecules that become more acidic upon absorption of light. They are widely utilized in a variety of fields, such as organic synthesis, molecular switching agents, and photodynamic therapy. Currently, the activity of most photoacids is induced by UV light, which limits their applications by the synthetic community. In this ­Synpacts article, we highlight our recent development of visible-light-­induced photoacids and their application in glycosylation reactions.1 Introduction2 Visible-Light-Induced Photoacids3 Synthesis of 2-Deoxyglycosides by Visible-Light-Induced Photoacid Catalysis4 Conclusion

Free Radical Polymerization Initiated and Controlled by Visible Light Photocatalysis at Ambient Temperature

2011 ◽  
Vol 44 (19) ◽  
pp. 7594-7599 ◽  
Author(s):  
Guan Zhang ◽  
In Young Song ◽  
Kyo Han Ahn ◽  
Taiho Park ◽  
Wonyong Choi
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Ambient Temperature ◽  
Radical Polymerization ◽  
Free Radical Polymerization ◽  
Visible Light Photocatalysis

The nature of paramagnetic species in nitrogen doped TiO2 active in visible light photocatalysis

2005 ◽  
pp. 498 ◽  
Author(s):  
Stefano Livraghi ◽  
Annamaria Votta ◽  
Maria Cristina Paganini ◽  
Elio Giamello
Keyword(s):  
Visible Light ◽  
Paramagnetic Species ◽  
Visible Light Photocatalysis ◽  
Doped Tio2 ◽  
Nitrogen Doped
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