scholarly journals The Effect of Transition Metal Doping on the Photooxidation Process of Titania-Clay Composites

2008 ◽  
Vol 2008 ◽  
pp. 1-9 ◽  
Author(s):  
Judit Ménesi ◽  
Renáta Kékesi ◽  
László Kőrösi ◽  
Volker Zöllmer ◽  
André Richardt ◽  
...  
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Ions ◽  
Copper Ions ◽  
Reference Sample ◽  
Transition Metal Ions ◽  
Ethanol Vapor ◽  
Light Sources ◽  
Kinetics Of ◽  
Uv C

Montmorillonite- composites containing various transition metal ions (silver, copper, or nickel) were prepared, and their photocatalytic efficiencies were tested in the degradation of ethanol vapor at 70% relative humidity. Two light sources, UV-rich ( = 254 nm) and visible ( = 435 nm), were used. The kinetics of degradation was monitored by gas chromatography. It was established that, in the case of each catalyst, ethanol degradation was more efficient in UV-C ( = 254 nm) than in visible light, furthermore, these samples containing silver or copper ions were in each case about twice more efficient than P25 (Degussa AG.) used as a reference. In photooxidation by visible light, /clay samples doped with silver or copper were also more efficient than the reference sample, P25 . We show that doping metal ions can also be delivered to the surface of the support by ion exchange and significantly alters the optical characteristics of the /clay composite.

scholarly journals Kinetics of Transition Metal Ion Catalyzed Oxidation of some Industrially Important Alcohols using Ammonium Meta Vanadate in Acidic Medium

2020 ◽  
pp. 35-41
Author(s):  
Harichandra A Parbat ◽  
D V Prabhu ◽  
Anna Pratima Nikalje
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Acidic Medium ◽  
Metal Ion ◽  
Crop Protection ◽  
Transition Metal Ions ◽  
Primary Alcohols ◽  
Oxidation Of Alcohols ◽  
Ammonium Meta Vanadate ◽  
Kinetics Of

Oxidation of alcohols has industrial importance as it yields several useful products.Toxic and costly metal ions like Os(VIII), Cr(VI), and Ru in different oxidation states are widely used for the oxidation of a variety of organic compounds. We are reporting herein the oxidation of the industrially useful primary alcohols, 2-Chloroethanol, 2-Butoxyethanol and 2-Phenoxyethanol using Ammonium metavanadate in acidic medium. Relatively less toxic and cheaper transition metal ions of the first series are effectively used as homogeneous catalysts for the oxidation of the alcohols to the corresponding aldehydes. 2- Chloroethanol is used as a precursor for ethylene oxide and is useful in the manufacture of crop protection chemicals, and pharmaceuticals.2-Butoxyethanol finds use in the making of paints, varnishes and industrial and household cleaners.

Effect of Doping Transition Metal Ions on Photocatalysis of TiO2 Nanowires

2012 ◽  
Vol 217-219 ◽  
pp. 203-206 ◽  
Author(s):  
Yu Ming Tian ◽  
Yuan Yuan Zhao ◽  
Chang Wei Gong ◽  
Yue Sheng Chai
Keyword(s):  
Transition Metal ◽  
Visible Light ◽  
Metal Ions ◽  
Visible Region ◽  
Methyl Orange Solution ◽  
Transition Metal Ions ◽  
Nanowire Arrays ◽  
Oxygen Absorption ◽  
Doping Content ◽  
Photocatalytic Activities

In order to restrain the recombination of electron-hole pairs of photocatalysis and induce the absorption spectra to shift to the visible region, TiO2nanowire arrays doped with different transition metal ions were prepared by sol-electrophoresis deposition method. The photocatalytic activities of all doped nanowire arrays (M/TiO2) were measured under visible light. Transition metal ions (Fe3+, Zn2+, Cr3+and Cu2+) were chosen as doping ions. The best doping content of each ion was found via photocatalytic degradation of methyl orange solution under visible light, there are 0.5 wt% Fe3+，1.0 wt% Zn2+，0.5 wt% Cr3+and 0.25 wt% Cu2+respectively. Under the best doping content of each ion for M/TiO2nano-arrays, the photocatalytic activities are Fe>Zn>Cu>Cr. The effect mechanisms are discussed from different views of doped semiconductor and surface oxygen absorption.

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