The adsorption of remasol, indigosol and naphtol yellow mixed dyes using activated carbon

The adsorption of remasol yellow, indigosol yellow, and naphtol yellow using activated carbon has been carried out. Batik dye poses some environmental problem when disposed directly to the water stream. The adsorption method is one of the effective methods that can decrease the concentrations of batik dyes such as remasol yellow, indigosol yellow, and naphtol yellow. These dyes were mixed as an artificial solution to investigate the adsorption conditions that can be applied in the processing of batik dye waste before disposed to the environment. The parameters that optimized in the adsorption of the dyes were variations in contact time, adsorbent dosage, and initial concentration. The preliminary study was conducted using Response Surface Methodology (RSM) with Box-Behnken design to optimize the adsorption parameters. The optimum contact time, adsorbent dosage, and initial concentrations obtained from RSM were 47.5-60 minutes; 8.5-12 mg; and 50-100 mg/L, respectively. The optimum condition for adsorption in this research were obtained at contact time 50 minutes with %Removal of each dye were 74.73%; 90.57%; and 93.50%; adsorbent dose 16 mg with %Removal of each dye was 74.61%; 89.22%; 92.32%; and the initial concentration of each dye was 25 mg/L with %Removal of each dyes 69.48%; 69.15%; and 75.08%. The maximum adsorption capacity of each dye was 40.38; 54.18; and 83.12 mg/g.