Determination of the Optimum Composition of Chitosan-Grafted Cellulose/TiO<sub>2</sub> Films Using the Box Behnken Design Method

Determination of the optimum composition of chitosan-grafted cellulose/TiO 2 film was performed using the Box-Behnken Design method from Response Surface Methodology (RSM). Apart from being able to determine the best composition for a composite, this method can also determine the influencing factors of the composition on the performance of the composite. This method was conducted by combining factorial group design. This design used three factors and three levels. Adsorption capacity data from the adsorption process and percent removal from the photocatalyst process were used as responses in determining the optimum composition of chitosan-grafted cellulose/TiO 2 films. Based on the results, the counterplot of grafted cellulose vs TiO 2 shows that both variables have the same influence, where the more grafted cellulose and TiO 2 added to the composite, the more adsorption capacity of the chitosan-grafted cellulose/TiO 2 film. The results from determining the composition, obtained the best composition, namely chitosan; grafted cellulose; TiO 2 each of 0.85; 0.2; 0.2 g.