Table showed the design of experiment (DOE) where a constant mass of ZnO (1 g/L) was used at a varying mass of Kaolin according to the DOE. The set up was allowed for 24 hours using magnetic stirrer, and then filtered using filter paper. It was dried in an electric oven at a temperature of 110 o C for 30 minutes. The sample was then placed in the crucible and calcined at temperature range of 300 to 600 o C in a muffle furnace for an activation process, and for a period range of 30 to 60 minutes as shown in the DOE which resulted to 17 runs.