Effect of Different Parameters on the Adsorption of Textile Dye "Maxilon Blue GRL" From Aqueous Solution by Using White Marble.

ASEEL M. KADIM ALJEBORI, and ABBAS NOOR ALSHIRIFI
Department of Chemistry, College of Science, Babylon University, Hilla, Iraq.

The adsorption of textile dye (Basic Maxilon Blue "GRL") from aqueous solution by white marble was studied. The effect of different experimental parameters such as shaking contact time, initial concentration of GRL "2-16 mg.L-1", initial pH "3-10" of aqueous solution, adsorbent dose "0.25-2 g/100ml", and temperature "283 K-308 K" on the adsorption of (GRL) were investigated. The applicability of adsorption isotherms to study the adsorption behavior has also been analyzed by Langmuir and Freundlich isotherm models were used to illustrate the experimental isotherms and isotherm s constants, and it was found Freundlich isotherm model fitted well the adsorption data compare with Langmuir model. The equilibrium time at normal pH was found 60 minutes, the pH of dye solution on the range of "8-10" was found favorable for the removal of (B-GRL), also the extent of adsorption found to decrease as the temperature increased. The thermodynamic parameters (?G, ?H, and ?S) were calculated, (?G) was calculated from equilibrium constant, and were explained in the mean of the chemical structure of the adsorbate. The concentration of (GRL) was measured before and after adsorption by using UV-visible spectrophotometer at 590 nm.