Photocatalytic reduction of platinum(II and IV) from their chloro complexes in a titanium dioxide suspension in the absence of an organic sacrificial reducing agent

2014 ◽  
Vol 148-149 ◽  
pp. 387-393 ◽  
Author(s):  
F. Mahlamvana ◽  
R.J. Kriek
Keyword(s):  
Titanium Dioxide ◽  
Reducing Agent ◽  
Photocatalytic Reduction ◽  
Chloro Complexes ◽  
Dioxide Suspension

Photocatalytic reduction behavior of hexavalent chromium on hydroxyl modified titanium dioxide

2017 ◽  
Vol 206 ◽  
pp. 293-299 ◽  
Author(s):  
Yali Li ◽  
Yingying Bian ◽  
Hongxia Qin ◽  
Yaxi Zhang ◽  
Zhenfeng Bian
Keyword(s):  
Titanium Dioxide ◽  
Hexavalent Chromium ◽  
Photocatalytic Reduction ◽  
Reduction Behavior

scholarly journals A Study on the Photocatalytic Reduction of Some Metal Ions in Aqueous Solution Using UV- Titanium Dioxide System

2019 ◽  
pp. 1-7
Author(s):  
I. O. Ekwere ◽  
M. Horsfall ◽  
J. O. E. Otaigbe
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Metal Ions ◽  
Metal Ion ◽  
Uv Light ◽  
Kinetic Studies ◽  
Photocatalytic Reduction ◽  
Alkaline Ph ◽  
Removal Of Metal ◽  
Removal Of Metal Ions

The photocatalytic reduction of Cu (II), Pb (II), Cd (II) and Cr (VI) ions in aqueous solution has been investigated. The photocatalyst utilized was nano titanium dioxide, composed of 80% anatase and 20% rutile; the UV light source was a 15 W UV bulb with a wavelength of 254 nm. The results obtained indicated a reduction efficiency order as follows; Cr6+ > Cu2+ > Pb2+ > Cd2+. It was observed that these results correlate with the respective reduction potentials of the metal ions. The effect of pH on the photocatalytic reduction of the metal ions was also carried out and results obtained indicated that with the exception of Cr (VI) ions, higher percentage removal of metal ions from their aqueous solution was recorded at alkaline pH than at acidic pH. This was attributed to an extensive formation of precipitate by the metal ions at alkaline pH. Kinetic studies revealed that the removal of metal ions from their solutions largely followed the pseudo- first-order kinetics. Therefore, the results of this study will be useful in metal ion removal from industrial waste water using photocatalytic process.

Research on the Ultra-Fine Titanium Dioxide Suspension Stability and Fractal

2011 ◽  
Vol 361-363 ◽  
pp. 288-295
Author(s):  
De Wei Chen ◽  
Xiao Ling Ge ◽  
Quen Tin Shi ◽  
Jiu Wang Tian
Keyword(s):  
Titanium Dioxide ◽  
Fractal Dimension ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Surface Sediments ◽  
Suspension Stability ◽  
Matlab Program ◽  
Different Types ◽  
Scanning Electron ◽  
Dioxide Suspension

Using scanning electron microscope, the microscopic pictures of the surface on sediment have been obtained from the sub-micron titanium dioxide suspensions without dispersant or adding different types of dispersants. Deposits of titanium dioxide suspension have been observed and the mechanism of the dispersant has been analyzed. Meanwhile, deposits of titanium dioxide gray distribution figure have been gained by self-compiled Matlab program, which proved that the surface sediments is fractal, and the fractal dimension has been calculated under different conditions. The rules between suspension stability and fractal dimension have been achieved.

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