scholarly journals Photocatalytic inactivation of dual- and mono-species biofilms by immobilized TiO2

2021 ◽  
pp. 112253
Author(s):  
C. Pablos ◽  
M. Govaert ◽  
V. Angarano ◽  
C. Smet ◽  
J. Marugán ◽  
...  
Keyword(s):  
Photocatalytic Inactivation ◽  
Immobilized Tio2

Photocatalytic inactivation of phage Qβ by immobilized titanium dioxide mediated photocatalyst

1997 ◽  
Vol 35 (11-12) ◽  
pp. 101-106 ◽  
Author(s):  
S. Lee ◽  
K. Nishida ◽  
M. Otaki ◽  
S. Ohgaki
Keyword(s):  
Inactivation Kinetics ◽  
Tio2 Photocatalyst ◽  
First Order ◽  
Inactivation Rate Constant ◽  
First Order Kinetics ◽  
Photocatalytic Inactivation ◽  
Black Light ◽  
Reaction Solution ◽  
Immobilized Tio2 ◽  
Rna Phage

Photocatalytic inactivation of virus by immobilized TiO2 was investigated using RNA phage Qβ as a model. TiO2-coated tiles, developed for interior sterilisation, were used as immobilized photocatalyst. 2.2 log Qβ was inactivated by immobilized TiO2 mediated photocatalysis by 1h irradiation with near UV black light at an intensity of 3.6×10−3W/cm2. Experiments with a slurry TiO2 reactor were also performed as a reference for the inactivation kinetics study. Photocatalytic Qβ inactivation was expressed by first-order kinetics as the initial concentration of the phage Qβ varied. The inactivation rate constant was proportional to the light intensity in the range of 3–8×10−3W/cm2 of black light with immobilized TiO2 photocatalyst. Broth introduced with phage into the reaction solution inhibited inactivation. No noticeable difference in inactivation was observed between germicidal lamp irradiation with and without immobilized TiO2.

Photocatalytic Inactivation of Escherichia coli with LbL Fabricated Immobilized TiO2 Thin Films

2011 ◽  
Vol 14 (1) ◽  
Author(s):  
Sharad Sontakke ◽  
Jayant Modak ◽  
Giridhar Madras
Keyword(s):  
Thin Films ◽  
Escherichia Coli ◽  
Tio2 Thin Films ◽  
Photocatalytic Inactivation ◽  
Immobilized Tio2

AbstractPhotocatalysis using semiconductor catalyst such as TiO

Aqueous microorganisms inactivation by photocatalytic reaction

2000 ◽  
Vol 42 (3-4) ◽  
pp. 103-108 ◽  
Author(s):  
M. Otaki ◽  
T. Hirata ◽  
S. Ohgaki
Keyword(s):  
Cryptosporidium Parvum ◽  
New Technology ◽  
Additive Effect ◽  
Light Irradiation ◽  
Photocatalytic Reaction ◽  
E Coli ◽  
Photocatalytic Inactivation ◽  
Immobilized Tio2 ◽  
Uv Lamp ◽  
Set Up

Photocatalysis by TiO2 is a new technology which can treat water without adding any chemicals. In this research, the disinfections of three microorganisms such as bacteriophage Qβ, E. coli and Cryptosporidium parvum were investigated. An immobilized TiO2 reactor was used and UV lamp and Black light (BL) lamp were used as light source. The intensity of each lamp was set up to equalize the photocatalysis efficiency determined by the decomposition rate of Methylene Blue. The additive effect of TiO2 to inactivation did not appear in the E. coli experiments with UV and BL irradiation or in the Qβ experiment with UV. In these three cases, light irradiation gave a high germicidal effect and the addition of inactivation by photocatalysis was relatively too small to be significant. In the Qβ experiment with BL and in the Cryptosporidium experiment with UV and BL, the additive effect by TiO2 could be seen clearly because these microorganisms were resistant to light irradiation in these cases. In spite of setting equal photocatalysis efficiency in both lamp reactors, UV photocatalytic inactivation of Cryptosporidium was much faster than BL. It is assumed that UV and photocatalysis enhanced each other.

scholarly journals Microorganisms Photocatalytic Inactivation on Ag3PO4 Sub-Microcrystals Under WLEDs Light Source

2021 ◽  
Vol 31 (5) ◽  
pp. 2233-2241
Author(s):  
J. F. Cruz-Filho ◽  
T. M. S. Costa ◽  
M. S. Lima ◽  
L. F. G. Nolêto ◽  
Carla C. S. Bandeira ◽  
...  
Keyword(s):  
Light Source ◽  
Photocatalytic Inactivation

Visible light photocatalytic inactivation of Escherichia coli by natural pyrite assisted by oxalate at neutral pH

2017 ◽  
Vol 248 ◽  
pp. 880-889 ◽  
Author(s):  
Masoud Moradi ◽  
Roshanak Rezaei Kalantary ◽  
Ali Esrafili ◽  
Ahmad Jonidi Jafari ◽  
Mitra Gholami
Keyword(s):  
Escherichia Coli ◽  
Visible Light ◽  
Neutral Ph ◽  
Photocatalytic Inactivation ◽  
Natural Pyrite ◽  
Visible Light Photocatalytic

scholarly journals Preparation and Characterization of Visible-Light-Activated Fe-N Co-Doped TiO2and Its Photocatalytic Inactivation Effect on Leukemia Tumors

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Kangqiang Huang ◽  
Li Chen ◽  
Jianwen Xiong ◽  
Meixiang Liao
Keyword(s):  
Electron Microscope ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Light Therapy ◽  
Cell Counting ◽  
Visible Absorption ◽  
X Ray ◽  
Photocatalytic Inactivation ◽  
Inactivation Efficiency ◽  
Co Doped

The Fe-N co-doped TiO2nanocomposites were synthesized by a sol-gel method and characterized by scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray diffraction (XRD), ultraviolet-visible absorption spectroscopy (UV-vis) and X-ray photoelectron spectroscopy (XPS). Then the photocatalytic inactivation of Fe-N-doped TiO2on leukemia tumors was investigated by using Cell Counting Kit-8 (CCK-8) assay. Additionally, the ultrastructural morphology and apoptotic percentage of treated cells were also studied. The experimental results showed that the growth of leukemic HL60 cells was significantly inhibited in groups treated with TiO2nanoparticles and the photocatalytic activity of Fe-N-TiO2was significantly higher than that of Fe-TiO2and N-TiO2, indicating that the photocatalytic efficiency could be effectively enhanced by the modification of Fe-N. Furthermore, when 2 wt% Fe-N-TiO2nanocomposites at a final concentration of 200 μg/mL were used, the inactivation efficiency of 78.5% was achieved after 30-minute light therapy.

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