Fullname Raad Nasrullah Salih
E-mail [email protected]
Birth Date 1992-04-12
Address Iraq - Bardarash/Duhok
university of zakho
university od zakho
KINETIC STUDY O F CONGO - RED PHOTO - CATALYTIC DEGRADATION I N AQUEOUS MEDIA USING ZINC OXIDE A S PHOTO CATALYST UNDER LED LIGHT
Science Journal of University of Zakho (Volume: 9)
The kinetic of photo catalytic degradation of Congo red dye using semiconductor in aqueous solution of ZnO has been studied. All photochemical experiments have been carried out in quartz photo cell 25ml capacity and the solvent used for all experiment was distilled water (D. W). The influence of temperature has been investigated as well. Spectrophotometric method was utilized for this work. Degradation kinetic has been done for absorption peak of Congored at 497nm and 344nm. Differentmethod was applied for this purpose, and the results show that the degradation of Congored was first order at 497nm and zero order at 344nm. Thedegradation of CR dye were increasedby increasing temperature from 20o C to 40oC and then degreased at 50o C and this is due to desorption that occur at the semiconductor surface while; in case of 10 o C the rate constant was higher than 20o C. However, when changing the concentration the rate constant dose not changed regularly, this perhaps due to the fact thatit does not follow the same order throughout the degradation process, and it does not obey Arrhenius law of activation energy.
PHOTO DEGRADATION OF 2 , 4 , 5 , 6 - TETRACHLOROISOPHTHALONITRILE ( CHLOROTHALONIL ) BY VISIBLE AND ULTRAVI O LET LIGHT IN THE PRESEN C E OF Z n O AND T i O 2
Science Journal of University of Zakho (Volume: 7)
photo catalytic degradation of fungicides (chlorothalonil) in suspension aqueous solution with semiconductors(TiO2, ZnO) and without semiconductor has been investigated. the influenceof different parameters such as light sources,the concentration of fungicides,type of semiconductors and temperature werestudied by uv- visible spectrophotometer at 232 and 254 nm. the degradation reaction order spect ra of chlorothalonil were determined which first order at 232 nm and second order at 254 nm. in addition, the rate constant, arrhenius factor and energy of activation can be estimated for both peaks. moreover, conductivit y of chlorothalonil has been recorded during the photo -degradation and the rate of reaction also has been determined that dependent on product formation.