Removal of basic blue and crystal violet with a novel biosorbent: Oak galls

In this study, the use of an extraordinary plant tissue, gall, has been studied for the removal of 2 differrent dyes. The adsorptions of basic blue (BB) and crystal violet (CV) were studied on raw Quercus macranthera galls (QMG). The effect of initial pH, contact time, initial dye concentration, and temperature was studied to explain batch adsorption process of the dyes on galls. Experimental data were assayed on pseudo-second order kinetic equations. The equilibrium process were well fitted with the Freundlich isotherm model for basic blue with the regression coefficients of 0.995, and the Langmuir isotherm for crystal violet with a regression coefficient of 0.993. The maximum adsorption capacities were 45.45 and 90.90 mg g-1 for basic blue and crystal violet, respectively. The results show that QMG has a great potential as an effective low-cost sorbent for removal of dyes from aquatic media.