Judul: Sintesis dan Karakterisasi Membran Polisulfon didadah Karbon Aktif untuk Filtrasi Air
Abstrak: Synthesis and characterization of polysulfone membrane doped activated carbon, which was made from raw material coconut shell and sengon wood, has been performed. Carbonization process was performed at a temperature of 500oC for 4 hours, followed by KOH immersion and steam activation, at a temperature of 850oC for 80 and 110 minutes. Structural characterization of activated carbon/charcoal was determined by scanning electron microscope (SEM) and X-Ray Diffractometer (XRD), and the electrical conductivity was measured using LCRmeter. All of activated carbon have fulfilled the Indonesian National Standard 06-3730-1995, for technical activated charcoal quality, except for the benzene adsorption and some of the iodine adsorption. Activated charcoal without KOH immersion and with steam activation time of 110 minutes of each raw material, were selected as the doping material for membrane, based on their optimum adsorption. Polysulfone membrane doped activated carbon was prepared by phase inversion method. Membrane characterization was determined by flux test with cross-flow method, the degree of swelling, mechanical strong with force sensor, morphological analysis by SEM, and crystallite structure analysis by XRD. Doping of polysulfone membrane with activated carbon, afford to change the characteristic and ability of membrane in water filtration. Membrane with the highest flux was obtained on the membrane doped with activated carbon sengon concentration of 2%. The resulting water flux values was 624.99 L/m2h. This correlates with its degree of swelling, that has the lowest value of 52.17%.
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Judul: Membran Komposit Selulosa Asetat-Polistirena Akibat Pengaruh SDS Dan Suhu
Abstrak: Nanopore membrane cellulose acetate-polystyrene with SDS as porogen, can be utilized as a filter in seawater desalination process. Nanopore membrane CA-PS was prepared under reverse phase method. The process was started with making polymeric mixed solution of cellulose acetate, polystyrene, and SDS in dichloromethane-acetone mixture (1:1), with composition of CA:PS:SDS were 9:1:0,5; 9:1:1; 9:1:1,5; 9:1:2; and 9:1: 2,5. The solution was stirred for ±16 hours and casted on the glass plate surface, and then submerged it into water of 40 oC and 60 oC. The average water flux in 40 oC temperature was 45,74−280,21 L/hour.m2 and in 60 oC temperature was 73,20−370,30 L/hour.m2. The average rejection index point membrane in 40 oC temperature was 23,41−37,39% and in 60 oC temperature was 30,77−37,93%. It showed that the membranes soaked in a warm water increased water flux and rejection index.
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Judul: Kajian Trichogrammatridea bactrae bactrae Nagaraja (Hymenoptera: trichogrammatidae) parasitoid telur Etiella zinckenella treitschke (Lepidoptera: pyralidae
Abstrak: Penelitian bertujuan mengkaji biologi T. bactrae bactrae pada telur E. zinckenella, mengkaji pengaruh tiga jenis inang terhadap biologi T. bactrae , dan mengkaji pelepasan T. bactrae dalam mengendalikan E. zinckenella. Penelitian dilaksanakan di Laboratorium Bionomi dan Ekologi Hama, Jurusan Hama Penyakit Tumbuhan, Fakultas Pertanian, Institut Pertanian Bogor, dan di lahan kedelai milik petani di Desa Mekarwangi, Kecamatan Ciranjang, Kabupaten Cianjur. Penelitian berlangsung sejak bulan Oktober 1994 sampai dengan Nopember 1995. Hasil percobaan menunjukkan bahwa pada telur E. zinckenella, persentase imago parasitoid yang muncul 97,69 %, atau mortalitas sekitar 2,31 %. Pada keadaan tersedia madu dan inang, lama hidup imago betina 46,40 jam. Masa peletakan telur sekitar 1,33 jam, dengan keperidian 18,00 butir per betina. Telur E. zinckenella umur 1 hari lebih dipilih dibandingkan umur 2 dan 3 hari, namun ketiga kelompok telur tersebut sama sesuainya untuk perkembangan parasitoid…dst
Keyword: Hymenoptera, Etiella zinckenella, Lepidoptera pyralidae