Adsorption of Crystal Violet Dye on Modified Bentonites

摘要

The adsorption of basic crystal violet dye on bentonite and four modified bentonite with different falty acids (bentonite FA1, bentonite FA2, bentonite FA3 and bentonite FA4) was investigated. The surface of each bentonite samples was examined before and after adsorption of dyes by FTIR technique. The effect of pH solution, initial concentration of dye and contact time on the adsorption of basic dye onto bentonites was studied. The results showed that the adsorption capacity of basic crystal violet was high on bentonites and modified bentonites with different degree. The Langmuir and Freundlich adsorption models were used to describe the adsorption process and to determine the isotherm constant. Based on the equilibrium data, which analyzed by two models and correlation coefficient, the Langmuir model was a good fit of experimental data than Freundlich model. This referred to the homogeneous surface for adsorption process.