Preparation of Biochar from Peanut Shells (Arachis Hypogaea L.) For Adsorption of Cadmium (II) Ion
This study focuses on making biochar from peanut shells which are used as adsorbent of cadmium (II) ion. The method involved carbonization process, and the biochar adsorption was analyzed by using Atomic Absorption Spectrophotometer (AAS). The water content and ash content of the biochar from peanut shells was 8.163%, and 6.061% respectively, which is met the National Industrial Standard (SNI) of Indonesia for biochar. Determination of the optimum pH and optimum weight of biochar conducted at the concentration of 60 ppm, and the optimum adsorption of biochar at various pH was 0.1g adsorbent occurred at pH 6 with a percentage of adsorption of 98.538%. The optimum weight of Cadmium (II) ion adsorption was at 100 mg with a percentage of 99.905%. Surface analyses were conducted using scanning electron microscopy – energy dispersive spectroscopy (SEM-EDS). The increasing of the weight of the adsorbent leads to an increased amount of Cd (II) adsorbed.
Keywords: biochar, peanut shells, adsorption, cadmium, AAS