<![CDATA[Shallot (Allium Cepa L. Var. Bima Brebes) skin is very abundant in Brebes. The cellulose content of shallot skin, with a value of 41-50%, has great potential to be processed into activated carbon. This study was conducted with the aim of analyzing activated carbon made from Brebes red onion skin with parameters of water content, ash content, volatile matter content, and pure carbon content. The method used was experimental, by conducting a carbonization process of red onion skin for 60 minutes and carrying out a carbon activation process using 3M phosphoric acid (H₃PO₄) activator and analyzing the resulting activated carbon. The results indicated that the water content of activated carbon was 9.83%, ash content was 9.24%, volatile matter content was 22.32%, and pure carbon was 65.83%. Activated carbon has an adsorption capability that works well for methylene blue but not for iodine. Shallot skin is effective for use as activated carbon due to its adsorption capacity for methylene blue of 130.95 mg/g, enabling it to adsorb molecules with a size of approximately 1 nm.Keywords - Activated Carbon, Pure Carbon, Shallot Skin.]]>
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