Degradation of an orga nic dye at acidic, n eutral and basic buffer solutions by photocatalytic process in the presence of titaniu m dioxide nanoparticles

A co mmon way to perform the decolo rization of pollutants is the use of photocatalytic removal processe s that are kn own by the generation of OH radicals under mild experim ental conditions [۱-۴]. ۳, ۷-Diamin ophenazathionium chlo ride (DAP TC) is harm ful if swallowed and m ay be harm ful by inhalation or through skin contact. In this work w e wish to report photo catalytic dec olorization of DAPTC on nano-structure titanium dioxide at acidic, neutral and basic buffer aqueous so lution. The kinetic stud y of decol orization of DAPTC in each buffer pH is described. Mate rials and m ethods: All c hemical reagents were prepared from Merck and Fluka chemical companies. ۳, ۷-Diaminophenazat hionium chloride was purchased from Aldrich. Nano-structure tita nium dioxide with average size of ۷۰ nm was used as photocatal yst. The photodecolori zation experiments were done by illumination of ۲۰ mL continuous aerated, stirre d buffer sol utions of DA PTC containing ۱۰-۲۰ mg of nano-titanium dioxide in a photoreactor cell under ۴۰۰W high pressure mercury lamp at constant temperature.

کلیدواژه ها:

Nano -Titanium di oxide ، Azo ، dye ، Photoc atalytic.