Abstract
This research aims to determine the influence from particle size and pH variation on lead (Pb) and zinc (Zn) adsorption by using activated carbon from cashew nut waste. Waste samples obtain at Kendari Bay of Southeast Sulawesi. The sample of cashew nut shell dried in the sun for 24 hours, then carbonated sample with temperature 250-500°C for 8 hours using pyrolysis reactor. After that the sample was smoothed with mortar and sieved using particle size variations 60,100 and 200 mesh. The sample was activated using a blast furnace for 20 minutes. Cashew nut shells and massive metal waste are tired using a shaker for 30 minutes. Samples activated with activation temperature 700°C with grain size variations and pH using Atomic Absorption Spectroscopy (AAS). The results of the analysis explained that grain size and pH variations affect the adsorption ability. The results obtained at pH six maximum particle size of 200 mesh on the metal Zn and Pb. The Consequences adsorbed metal of 0.6913 mg/L for Zn metal and 0.7966 mg/L for Pb with the absorption efficiency of 99% for Zn and 95% for Pb. Getting more approaching acidic pH, the better the adsorption ability and the smaller the grain size, the higher the adsorption capacity.
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