Removing of some medical pigments from their aqueous solutions as contaminants by electrocoagulation method

Abstract

This research included a study of a number of factors affecting the process ofelectrocoagulation (EC) for following pigments (Blue.2), (Suppra green), Such aspigment concentration , electrolyte concentration and electrode type used in theprocess . The data was applied using a glass cell made of dimensions (5x8x10)cm withcapacity 400ml using electrodes of pure aluminum and stainless steel (S.S.318) each ofthem in dimensions (Length 9 cm Width 3.2 cm c 0.1 cm) connect a distance betweenelectrodes 2 cm and connect them to a digital power source DC (PS 30330 2-V,3A)and external voltage (30 Volt) and with a range of concentrations (50200-150-100-ppm) With the above-mentioned pigments and using salt (Na2SO4) as electrolyte andconcentrates (50150-100- ppm) at laboratory temperature .The percentage of removal (R%) indicates that it increases over time and increaseselectrolyte concentration It is also increased by increasing the concentration of the dyewhen using the aluminum electrode (Al) and decreasing the concentration of the dyewhen using the stainless steel electrode (SS.318) It was found that the best removal ratiowas achieved at 200 ppm concentration at the aluminum electrode and in percentagesBlue.286.60% , Suppra green%57.98 ,and concentration 50 ppm at the stainless steelBlue.298.49% , Suppra green%77.22 ,for pigments at electrolyte concentration (150ppm) . Results indicated that percentages of removing for pigments studied increasingin the following order Blue.2 > Suppra green. Kinetic studies for removing pigments atconcentration (50 ppm) with and without electrolyte through application equation offirst order it gave strong correlation indicated process first order and rate constant ofreaction calculated(k).