Optimization Using Central Composite Design (CCD) on Cellulose Acetate/Polyethylene Glycol Composite Beads for Adsorption of Methylene Blue in Batch System

Abstract

Textile dyes waste can cause a big problem for the environment. Adsorption is a simple approach in treatment of textile dyes waste. On the other hand, the use of disposable adsorbents also creates production cost problems because they are less economic. Currently, research on adsorbents is forwarded to the use of biopolymers such as chitosan, chitin, and cellulose. This research studied the use of cellulose beads, made from cellulose acetate (CA) blended with polyethylene glycol 200 (PEG200), as adsorbent in removing cationic dye of methylene blue (MB). Adsorption performance of cellulose beads was evaluated and optimized under variation of adsorption conditions (pH, beads dose, dye concentration) and PEG200 content. Optimization was carried out by using response surface methodology (RSM) with a face-centered central composite design (FCCD) model. The results showed that the optimum condition was obtained at pH of 7, beads dose of 2 g/L, dye concentration of 20 mg/L for bead composition of CA/PEG200 (90/10). The optimum % dye removal predicted by the design model was 52.4706 %.