Aspama, Rifa2021-08-262021-08-262020-10wahyu sari yenihttps://repository.unri.ac.id/handle/123456789/10159Composite is a material that is formed from two or more materials with different properties, so that a material with different properties and characteristics is produced. Composite consists of reinforcement and a matrix. In this study, hydroxyapatite was acted as a matrix and the reinforcement was derived from gelatin. The purpose of this study was to synthesize hydroxyapatite-gelatin composites using the microwave method with prekursor (NH4)2HPO4 dan Ca(OH)2 precursors and also the adsorption test on methylene blue. The results of the analysis of the chemical composition of the shellfish contained CaO (97.368%). Based on the results of adsorption of methylene blue using hydroxyapatite-gelatin composites, the optimum conditions for each of the adsorbent mass variations were obtained, at K-HAp / Gel 0% was 10 mg (60.612%); K-HAp / Gel 10% is 5 mg (76.593%); K-HAp / Gel 20% is 10 mg (77.110%) while for K-HAp / Gel 30% is 25 mg (79.903%).encompositegelatinehydroxyapatiteArticle