scholarly journals Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

2010 ◽  
Vol 166 (1) ◽  
pp. 1-6 ◽  
Author(s):  
L. Gomathi Devi ◽  
B. Narasimha Murthy ◽  
S. Girish Kumar
Keyword(s):  
Photocatalytic Activity ◽  
Transition Metal ◽  
Metal Ions ◽  
Crystallite Size ◽  
Transition Metal Ions ◽  
Electronic Configuration

Effect of transition metal ions on photocatalytic activity of ZnO in bleaching of some dyes

2006 ◽  
Vol 88 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Suruchi Bhandari ◽  
Jitendra Vardia ◽  
R. K. Malkani ◽  
Suresh C. Ameta
Keyword(s):  
Photocatalytic Activity ◽  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions

Controlled synthesis of carbons-adjacent and-apart nido -and arachno-carborane anions and their metal complexes

2003 ◽  
Vol 75 (9) ◽  
pp. 1335-1341 ◽  
Author(s):  
Zuowei Xie
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Complexes ◽  
Recent Work ◽  
Transition Metal Ions ◽  
Electronic Configuration ◽  
Controlled Synthesis ◽  
Difficult Challenge ◽  
Bridge Length ◽  
Carborane Anions

The controlled synthesis of carborane anions is a difficult challenge and is of great interest to synthetic chemists. By varying the bridge length of cage carbons-linked o-carboranes, the two cage carbon atoms are locked in place during the reactions, leading to the controlled synthesis of ortho-, meta- and para-isomer of nido-carborane dianions. The isomers of arachno-carborane tetraanions can also be prepared in the controlled manner via chang- ing the electronic configuration of the transition-metal ions or the bridge length. This article provides an overview of our recent work on this subject.

Comparison of photocatalytic activities of 3d transition metal ions for hydrogen peroxide photolysis and photoinitiated hydroxylation of 2-hydroxybenzoic acid

1987 ◽  
Vol 52 (10) ◽  
pp. 2451-2456 ◽  
Author(s):  
Petr Sedlák ◽  
Stanislav Luňák ◽  
Pavel Lederer
Keyword(s):  
Hydrogen Peroxide ◽  
Photocatalytic Activity ◽  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
The Other ◽  
Radical Formation ◽  
Quantum Yields ◽  
Hydroxybenzoic Acid ◽  
Photocatalytic Activities

Quantum yields of hydrogen peroxide photolysis and photoinitiated hydroxylation of 2-hydroxybenzoic acid in the presence of 3d transition metal ions have been measured. Marked photocatalytic effects were only observed for Cu(II) in hydrogen peroxide photolysis, and for Fe(III) in photoinitiated hydroxylation of 2-hydroxybenzoic acid. No photocatalytic activity was detected for the other 3d transition metal ions investigated. Fe(III) and Cu(II) differ in their photocatalytic activities, suggesting that the simple concept of free OH. radical formation cannot explain the mechanisms of their action.

scholarly journals Study of Photocatalytic Activity and Properties of Transition Metal Ions Doped Nanocrystalline TiO2Prepared by Sol-Gel Method

2014 ◽  
Vol 2014 ◽  
pp. 1-4 ◽  
Author(s):  
K. S. Siddhapara ◽  
D. V. Shah
Keyword(s):  
Photocatalytic Activity ◽  
Transition Metal ◽  
Metal Ions ◽  
Uv Light ◽  
Sol Gel ◽  
Visible Region ◽  
Transition Metal Ions ◽  
Gel Method ◽  
X Ray ◽  
Sol Gel Method

Transition metal (Mn, Fe, Co,) doped TiO2nanoparticles were synthesized by the sol-gel method. All the prepared samples were calcined at different temperatures like 200°C to 800°C and characterized by X-ray diffraction (XRD) and energy dispersive X-ray (EDX) analysis. The studies revealed that transition metal (TM) doped nanoparticles have smaller crystalline size and higher surface area than pure TiO2. Dopant ions in the TiO2structure caused significant absorption shift into the visible region. The results of photodegradation of formaldehyde in aqueous medium under UV light showed that photocatalytic activity of TiO2nanoparticles was significantly enhanced by the presence of some transition metal ions. Chemical oxygen demand (COD) of formaldehyde solutions done at regular intervals gave a good idea about mineralization of formaldehyde.

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