Studying of Photodegradation of Prepared Azo-dyes by TiO2

Abstract

The work consists of two parts . The first deals with the preparation of some
mono azo dyes : 4- phenyl azo – α – fluoro phenol (BAFP) , 4 – phenyl azo – α – chloro
benzoic acid(BACB) , 4- phenyl azo – α – methyl phenol (BAMP ) . The prepared
compounds have been identified by FT-IR ,and UV-Visible absorption spectroscopy .
The second part consists of photodegradation of the azo compounds mentioned
above at lab temperature in presence and absence of titanium dioxide (anatase ) as
suspension by exposure of aqueous solution of dyes using light from a 150 w lamp with
wavelength 350-800 nm. Generally it has been found that the rates of photodegradation
of three dyes were higher in presence of TiO2 suspention .
In this paper some physicochemical properties of the dyes , such as the electron –
donor or electron – withdrawing character of dyes have been employed to asses their
photodegradability.The results of photodegradation of all dyes illustrate that the rate of
the degradation process depends on the conc. Of TiO2 , and physicochemical properties
of the dyes .