Sawitri, E.; Azmiyawati, C.; Siahaan, P.; Darmawan, A. SYNTHESIS OF ADSORBENT MAGNETITE SILICA FUNCTIONALIZED CETYLTRIMETHYLAMMONIUM BROMIDE (CTAB) FROM IRON SAND KLAYAR BEACH PACITAN. J.Sains Dasar 2018, 7, 29-34.