IMPACT OF IONIC INTERACTIONS ON THE MECHANISM OF THE PHOTOCATALYTIC REDOX REACTION OF TOLUIDINE DYE WITH DIETHYLTHIOUREA

This investigation covers the interaction of the unreacted dye wastewater with various inorganic anions and cations like Cl-, Br-, I- and NO3- CO3-, SO42- , K+ , Na+,Ca2+ , Mg2+, Co2+ , which are an open threat to the environment because it results in many non degradable complex polymer formation. Currently wide spread researches are in progress for the development of de-coloration techniques for the control of textile industries effluents. Our Study is focused on the decoloration / redox /encoring , abilities of different cations and anions at various important coperational parameters in the bleaching of the TB with DETU, . These are vital chemicals of textile dye industry effluent and should be addressed properly before disposal. The kinetics and mechanism study for decolorization and reduction of Toluidine blue (TB) with DETU in acidic medium were monitored at = 625 nm by observing the diminution in TB concentration using spectrophotometer. Kinetics of decolorization of dye was followed spectrophotometrically at different operational variables. Influence of addition of dye into reaction mixture retarded the bleaching processes which got enhanced by the addition of , DETU . Whereas the added salts showed a ripple of different behavioral aspects , which could be predicted on the basis of their interactions with the super active free Radicals .The variations of ionic strength of the medium in which the reaction was monitored and observed in NaCl salt solutions .It was found that variations had moderate effect on dye decolorization . Decoloration showed the following order for salts , Na+ > K+ > Ca2+ ?Mg2+ ,Na+ ion being strong electrolyte delivered appreciable contribution on the dye decoloration ,Ca2+ and Mg2+ ions formed hydroxide precipitates , whereas Co2+ formed polycomplex with DETU . The tested anions showed that the dye decoloration was more prominent in presence of anions and followed the order I- >NO3- >HCO3-?Cl- > SO42- .The aspects with I- ion were exceptional ,it exhibited brilliant photocatalytic performance.