Desy Permatasari, 1517011084 (2019) ADSORPTION OF MULTICOMPONENT SOLUTION OF Cu(II) IONS, METHYLENE BLUE, AND CRYSTAL VIOLET ON ADSORBENT BIOMASS Porphyridium sp. SILICA-MAGNETITE (Fe3O4). Fakultas Matematika dan Ilmu Pengetahuan Alam, UNIVERSITAS LAMPUNG.