Abstract
Corn cob based activated carbons have been made through processes of pre-carbonization and microwave assisted chemical activation. In this study, potassium hydroxides (KOH) are used as an activating agent, which by 5% potassium hydroxides in weight of self-adhesive carbon grain of corn cob are soaked in 150 ml distilled water. Samples are then irradiated using microwave with power of 360, 450, and 720 watt for 15 minutes. The activated carbons are applied for water purification of sea water. Physical and chemical properties of the activated carbon are characterized, including microstructure, surface morphology, heavy metal adsorptions, and pH, temperature and colour of sea water. Analysis of microstructure show that the activated carbons have amorphous structure marked by two ramp peaks at the 2θ around of 22 and 44°, respectively. The morphological surface shows that AC720 has more porous rather than AC360, and AC450. The porous activated carbon of AC720 has the highest heavy metal adsorption of 85,20%, 89,80%, and 70,41% for Ni, Pb, and Zn, respectively corresponding to colour level of 126 PtCo, salinity of 25,6% and pH of 7,41.
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