Cryptomelane is a hollow type manganese oxide mineral that has a tunnel structure of 2x2. The mineral cryptomelane can be used as an adsorbent and catalyst for the degradation of organic compound wastes. The purpose of this study was to synthesize cryptomelane type manganese oxide by sol-gel method using KMnO4 and C6H8O7. The products were then treated with an acid (acetic acid) and base (KOH) …