Titania Catalysts Lab Report

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NOBLE METAL IMPREGNATED TITANIA PHOTOCATALYST FOR THE DEGRADATION OF TEXTILE DYES Dr.R.Vaithiyanathan Associate Professor, Department of Chemistry Jerusalem College of Engineering,Velachery Main Road, Narayanapuram, Pallikkaranai, Chennai-600 100, Tamilnadu, India Contact No: 09444070610 Email id: sirkazhi74@gmail.com ABSTRACT Photocatalytic decolourisation of four different commertial textile azo dyes was studied under UV irradiation (365 nm) using titania catalysts, synthesized via sol gel method. In order to improve the photocatalytic activity of bare TiO2, silver metal impregnated titania catalysts containing varying amount of silver metal from 0.5-2.0% were synthesized and their photocatalytic activities towards the decolourization of selected dyes…show more content…
This increase in the activity of silver doped titania catalyst may be due to its lower band gap values and the effective separation of electron-hole recombination by silver metal. However impregnation of silver beyond 1% reduced the photocatalytic activity of TiO2. At higher concentration, the silver particle covers the active sites of titania which prevents light absorption as well as the absorption of organic substrate from contacting the titania surface thereby reducing the efficiency of TiO2 photocatalyst. The results showed that titania containing 1% silver exhibited high photocatalytic activity due to the following reasons; (i) its lower band gap value (3.07 eV) causes effective light absorption and (ii) separation of electron-hole pair recombination by silver metal. CONCLUSION ? TiO2 and silver (0.5-2 %) modified titania catalysts were synthesized via sol gel method. ? Silver impregnation decreased the band gap value of titania. Therefore all the silver impregnated titania catalysts showed higher photocatalytic activity

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