Box-Behnken studies on dye removal from water using chitosan and activatedcarbon adsorbents

The percentages of adsorption of Rhodamine 6G from water using both chitosa n and activated carbon adsorbents: at three particle sizes (0.5, 0.75, and 1.0 mm), temperatures (30, 45, and 60 degreesC), and initial pH values (7, 8, and 9) were compared. The Box-Behnken design was applied in a second-deg ree quadratic polynomial regression model to test the effects and interacti ons of the variables using three-factorial experimental designs. The statis tical analysis revealed that the second-degree quadratic model gave a good fit with an R-2-value of 0.9704 and 0.9989, and an F-value of 25.5 and 719. 9 with chitosan and activated carbon, respectively. The significance for ea ch variable on the adsorption of dye Rhodamine 6G was identified, and the o ptimal conditions for dye removal were obtained.