Effect of ball-milling and Fe-/Al-doping on the structural aspect and visible light photocatalytic activity of TiO2 towards Escherichia coli bacteria abatement

2014 ◽  
Vol 38 ◽  
pp. 11-19 ◽  
Author(s):  
Laurent Schlur ◽  
Sylvie Begin-Colin ◽  
Pierre Gilliot ◽  
Mathieu Gallart ◽  
Gaëlle Carré ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Ball Milling ◽  
Structural Aspect ◽  
Al Doping ◽  
Visible Light Photocatalytic Activity ◽  
Escherichia Coli Bacteria ◽  
Visible Light Photocatalytic

PHOTOCATALYTIC AND ANTIBACTERIAL ACTIVITY OF TITANIUM, FLUORINE AND SILVER CO-SUBSTITUTED HYDROXYAPATITE

2013 ◽  
Vol 22 ◽  
pp. 268-277 ◽  
Author(s):  
M. SANDHYARANI ◽  
N. RAMESHBABU ◽  
K. VENKATESWARLU ◽  
K. V. RAVISANKAR ◽  
M. ASHOK ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Heat Treatment ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Visible Light ◽  
Crystal Size ◽  
Potential Candidate ◽  
Visible Light Photocatalytic Activity ◽  
Heat Treated Condition ◽  
Visible Light Photocatalytic

Synthetic hydroxyapatite (HA), an analogue of the mineral component of bone tissue has been widely used in medicine as bone replacing material. To impart specific properties, HA can be chemically modified by anionic and cationic substitutions during synthesis. Thus the present study was focused in synthesizing nanocrystalline Ti , Ag and F co-substituted HA by microwave synthesis. The prepared powders were characterized by XRD and FTIR for their crystal size, cystallinity and functional groups respectively. XRD spectra reveal that crystal size of prepared powders was in the range of 21–25 nm in as synthesized condition and 45–51 nm in 900 ˚C heat-treated condition. Complete decomposition of HA to tri calcium phosphate was observed for Ti substituted HA powder after heat-treatment. Addition of F improved the thermal stability of Ti substituted HA as indicated by predominant phase of HA after heat-treatment. The photocatalytic activity of co-substituted HA powders was examined by degradation of methylene blue (5 × 10−5 M concentration) under visible light irradiation and the results were compared with pure HA . The degradation efficiency of co-substituted HA with respect to methylene blue was twice as high as that of pure HA. Ti and Ag has improved the visible light photocatalytic activity of HA, further F co-substitution has not affected the photocatalytic activity of substituted HA. The antibacterial effect of prepared powders was observed against 1 × 105 cells/mL of Escherichia coli using spread plate method at 24 h incubation period. Ag co-substituted HA showed complete inhibition of growth of Escherichia coli. Thus, among Ti , Ti-F , Ti-F-Ag substituted HA powders, Ti-F-Ag co-substituted HA with excellent visible light photocatalytic activity and anti-bacterial property is expected to be a potential candidate for biomedical applications.

Preparation of visible light-driven g-C3N4@ZnO hybrid photocatalyst via mechanochemistry

2014 ◽  
Vol 16 (33) ◽  
pp. 17627-17633 ◽  
Author(s):  
Jianwei Zhou ◽  
Mo Zhang ◽  
Yongfa Zhu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Ball Milling ◽  
Hybrid Structure ◽  
Visible Light Photocatalytic Activity ◽  
Visible Light Driven ◽  
Visible Light Photocatalytic ◽  
Hybrid Photocatalyst

The multilayer hybrid structure of g-C3N4@ZnO materials with remarkable visible light photocatalytic activity was formed by ball milling.

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