A COMPLEX SURFACE FORMATION MODEL ON CHITOSAN ADSORPTION TO METALS

The aim of the first year research is: to predict a complex surface formation between chitosan and metal ions. This prediction is according to the plot adsorptive capacity and the bonding tendency between chitosan and some metals. Chitosan as adsorbent isolated from Green Crab’s shell. Metal ions used in this research are Cr(III), Cu(II), Ni(II), Zn(II), Fe(II) and Pb(II). The subject of this research is green crab’s shell (Scylla serata) and the object is the adsorptive capacity chitosan to some metal ions. Chitosan was prepared in three steps: deproteination, demineralization and deacetylation. This chitosan are impurities by 20 %- 30%kitin. The adsorption experiment was carried out at room temperature for 24 hours. A half gram of chitosan was added into 50 mL of various metals solution at pH system 5. This experiment was performed in two methods. An each ion metal was adsorbed by chitosan and some metal ions i.e: Cr(III), Cu(II), and Ni(II) (1:1:1) were adsorbed simultaneous. Chitosan was characterized by FTIR. Metal ions concentration before and after adsorption was measured by by AAS. Adsorptive capacity is defined as differences of metal ion concentration due to the adsorption per gram chitosan. Then the obtained data was plotted through Langmuir isotherm and Freundlich isotherm equations. The result of this work concludes that adsorptive capacity of chitosan in order for some metals ion are Cr(III) > Fe(II)> pb(II) = Zn(II)> Ni(II) = Cu(II). The interaction chitosan with metal ions is indicated complex surface formation by -NH2 groups or –OH groups. A multilayer are formatted by active site chitosan and metal ion interactions, but the interaction of chitosan to copper(II) is prefer a monolayer formation. Key words: chitosan, adsorption, multilay FMIPA, 2006 (PEND. KIMIA

PENINGKATAN NILAI EKONOMI DANPEMBUATAN PELET IKAN SEBAGAI ALTERNATIF MENGURANGI LIMBAH AYAM POTONG

Telah dilaksanakan PPM pada hari Minggu, tanggal 16 Agustus di daerah dusun Losari Sukoharjo Ngaglik Sleman, dihadiri oleh ibu-ibu PKK dusun Losari, Sukoharjo, Ngaglik, Sleman, Yogyakarta. Tim Pembina dari dosen-dosen Kimia F.MIPA UNY. Adapun tujuan diadakan PPM antara lain: 1. Dapat menciptakan kemandirian kenyamanan dan kesejahteraan ibu-ibu, melalui pelatihan kegiatan pembuatan pellet ikan. 2. Dapat meningkatkan kemampuan ibu-ibu tentang konsep pellet ikan yang kaya gizi.3. .Ibu-ibu dapat mengolah limbah ayam potong secara mandiri.4. Dapat meningkatkan keterampilan ibu-ibu dan keberhasilan dalam mengolah pellet ikan. 5. Dapat menambah penghasilan tambahan bagi ibu-ibu, karena limbah ayam potong yang biasa dibuang, ternyata dapat diolah menjadi pakan ikan melalui pembuatan pellet ikan 6. Dihasilkan produk bahan pakan ikan yang harganya terjangkau dan dapat menjadi bahan pakan ikan yang siap jual yang mempunyai banyak khasiat. Hasil kegiatan yang telah dilaksanakan, setelah diadakan monitoring dengan cara memberikan angket adalah: 1) Kegiatan dirasakan sangat bermanfaat (29,63%), bermanfaat (44,44%) dan cukup bermanfaat (25,93%) bagi peserta kegiatan pengabdian kepada masyarakat; 2) Penyampaian materi dirasa sangat baik (18,52%), baik (62,96%) dan cukup baik (18,52) oleh peserta; 3) Metoda penyampaian materi dirasa sangat baik (8%), baik (76%) dan cukup baik (16%) oleh peserta; 4) Kegiatan dirasa sangat membantu membuka wawasan (37,04%), membantu membuka wawasan (33,33%) dan cukup membantu membuka wawasan (29,63%)