فلاح شريف الخفاجي ( أستاذ )
كلية الصيدلة - صيدلة عام ( رئيس القسم )
[email protected]
The Study On Photo Degradation Of Crystal Violet By Polarographic Technique
بحث النوع:
علوم التخصص العام:
Falah Shreef Abed Suhail اسم الناشر:
Muthana Saleh Mashkour , Deemah Saeb اسماء المساعدين:
International Journal of Basic & Applied Sciences IJBAS-IJENS Vol:15 No:03 الجهة الناشرة:
155103-8484- IJBAS-IJENS @ June 2015 IJENS  
2015 سنة النشر:


This work include the photocatalytic degradation of an aqueous crystal violet [Tris((dimethylamino)phenyl) methylium chloride] dyes by using ZnO catalyst photo catalyst in aqueous medium, Photocatalytic degradation of dyes was carried out by using UV radiation as light source. The result of this study expressed by current diffusion against time to using polarographic technique. The effect of some parameters, such as mass of catalyst, Initial dye concentration, initial pH of aqueous dye solution and temperature were studied. The results indicate that the photocatalytic reactions are a pseudo first order reactions according to the Langmuir-Hinshelwood relationship. It was observed that the photocatalytic degradation efficiency increase with increase of catalyst mass up to 0.1g.For above this masses, photocatalytic degradation efficiency was decreases with increasing of catalyst mass . The results also showed an increase in the photocatalytic degradation efficiency with increasing of initial pH up to maximum value. The results also showed that degradation efficiency was inversely directed with the initial dye concentration. The degradation of crystal violet dye increases slightly with increasing temperature. The activation energy is equal to( 27.55) kJ.mol-1 . The thermodynamic parameters of the degradation of crystal violet have been reported. The positive ΔH# refer to endothermic reaction , the positive ΔG# obtained indicate that the reaction is non-spontaneous ,the positive ΔS# obtained indicate the reactants is more regularly than produce. The result indicate that the dye was degraded and the suggest mechanism show that the final product of degradation of crystal violet dye was CO2 and H2O. De colorization and degradation of crystal violet dye in the absence of light and/or catalyst were performed to demonstrate that the presence of light and catalyst was essential for the degradation of this dye.