POTENSI ARANG AKTIF BIJI ALPUKAT (Persea americana Mill) SEBAGAI ADSORBEN ION KADMIUM (II) DAN TIMBAL (II) DENGAN AKTIVATOR H2SO4

Abstract

Utilization of avocado seed as activated carbon has been done. The activated carbon of avocado seed was made by carbonization at 400oC for ± 2 hours and chemical activation using H2SO4 with various concentration of 2.5; 5.0 and 7.5%. The characterization result showed that activation using 5.0% H2SO4 have a good characteristics with 3.68% of moisture content, 0.84% of ash content, 385.22 mg/g of iodine adsorption and 19.62 m2/g of surface area. Fourier Transform Infrared (FTIR) was used to determine the functional groups of activated carbon. The activated carbon was used to adsorb cadmium and lead ions. Concentration of cadmium and lead ions were analyzed using Atomic Absorption Spectrophotometer (AAS). Optimum adsorption of activated charcoal avocado seeds were obtained at 0.38 ppm for 97.11% of cadmium ions and at a concentration of 4.83 ppm for 97.92% of lead ions