PENGARUH PERBANDINGAN KOMPOSISI KITOSAN DAN SILIKA TERHADAP KARAKTERISASI ADSORBEN KITOSA-SILIKA BEAD (EFFECT OF CHITOSAN AND SILICA COMPOSITION TO CHARACTERIZATION OF CHITOSAN-SILICA BEAD ADSORBENT) - INDRAWATI, DEWI; Jurusan Kimia FMIPA-Universitas Negeri Surabaya (UNESA Journal of Chemistry, 2013)