Judul: Sintesis Nanokristal Magnetit Menggunakan Urea sebagai Penjerap Cr(VI)
Abstrak: The study was to synthesize and characterize magnetite nanocrystal. Magnetite powder was synthesized using hydrothermal method from FeSO4 as precursor and sodium hydroxide and urea as the base sources. Characterization of the obtained powder was carried out using X-ray diffraction, scanning electron microscope, and energy dispersive X-ray analyzer. The crystallite size of magnetite by X-ray diffraction was obtained from 18,23 to 67,34 nm. The scanning electron microscope observations showed that magnetite particles underwent agglomeration. Magnetite powder was used as Cr(VI) adsorbent. The results showed that adsorption capacity for urea-based magnetite at pH 1-5 in 2 hours were 1.92; 1.91; 1.59; 1.20; and 1.21 mg/g, respectively. Adsorption capacity for sodium hydroxide-based magnetite (pH 1-5, 2 hours) were 1.74; 1.83; 0.64; 0.69; and 0.77 mg/g. The results indicated that urea-based magnetite is able to increase adsorption capacity.
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Judul: Kinerja Komposit Karbon Aktif-Magnetit sebagai Adsorben Ion Cr(VI).
Abstrak: Komposit karbon aktif-magnetit merupakan adsorben yang dapat digunakan untuk menjerap ion kromium heksavalen. Penelitian ini bertujuan menyintesis komposit karbon aktif-magnetit (KA-Fe3O4), menguji kinerjanya dalam menjerap ion Cr(VI), serta menentukan model adsorpsinya. Komposit karbon aktif-magnetit disintesis dengan metode hidrotermal dan dicirikan dengan spektroskopi inframerah. Parameter uji pada penentuan kondisi optimum adsorpsi berupa konsentrasi awal, pH larutan, dan waktu kontak. Kondisi optimum adsorpsi kedua adsorben diperoleh pada konsentrasi awal 350 mg L-1, pH larutan 3, dan waktu kontak 5 jam. Kapasitas adsorpsi karbon aktif dan karbon aktif-magnetit masingmasing 3.32 dan 3.30 mg g-1. Tambahan magnetit pada komposit karbon aktifmagnetit tidak menunjukkan perbedaan yang nyata dibandingkan dengan adsorben karbon aktif. Komposit karbon aktif-magnetit mengikuti model isoterm Langmuir.
Keyword: adsorpsi, karbon aktif, komposit, kromium, magnetit

Judul: Etno-ornitologi Burung Kancilan Flores (Pachycephala nudigula nudigula Hartert 1897) pada Masyarakat Lio di Taman Nasional Kelimutu
Abstrak: Bare-throathed whistler is one of several wild birds in Kelimutu National Park (TNKL) that is believed to have correlation with Lio Community‟s belief. The estimation of Bare-throated whistler‟s population in Kelimutu National Park was about 186.41-1668.07 individual by the density about 0.0389-0.3481 ind/ha with the sex ratio 6.2:1 that spreaded on area with height of 1100 – 1600 masl. The characteristic of Bare-throated whistler‟s habitat is a natural forest with various canopy level, high plant species diversity and high density. The habitat characteristics related to the availability of food in the form of insects, cover, safety and a nesting site. Generally the most of Lio community knew the existence of Bare-throated whistler directly or from their parents‟ stories. The perceptions of Lio Community to the Bare-throated whistler‟s existence is generally support the conservation efforts. The perceptions construct the Lio Community‟s atitude that tend to be conservative to the existence of Bare-throated whistler. The attitude shown by their behavior that not cathing the Bare-throated whistler from the TNKL‟s area or the outside. The attitude have an important role to the existence of Bare-throated whistler in Kelimutu National Park‟s area.
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