Decolorization of Reactive Red 195 solution by Cassia fistula seed gum

Abstract

In this paper the ability of Cassia fistula seed gum in color removing reactive red 195 solution has been tested by Jar-test experiment. The influence of several parameters such as pH, agitation speed, reaction time, gum dosage or initial dye concentration (IDC) have been tested. pH results to be an interesting variable and dye removal increases as pH increases to 10. This effect is optimum (57.8 %) at gum dosage 200 mg/L, agitation speed and reaction time seems not to be so affecting parameter, while IDC appears to be a very important variable in color removal capacity, which is higher as IDC decreases (obtained highest decolorization at IDC 10 mg/L). This result indicates Cassia fistula seed gum can be used as an “green” coagulant for color removal from reactive dyeing solution