Judul: Synthesis Adsorbent Poly(acrylic acid)-g-Cellulose/Bentonite Using Gamma Ray Irradiation for Uranium (IV) Adsorption, Synthesis Adsorbent Poly(Acrylic Acid)-g-Cellulose/Bentonite Using Gamma Ray Irradiation for Uranium (IV) Adsorption, Synthesis Adsorbent Poly(Acrylic Acid)-g-Cellulose/Bentonite Using Gamma Ray Irradiation for Uranium (IV) Adsorption
Abstrak: Penggunaan teknologi nuklir di Indonesia berkembang pesat ditandai dengan semakin banyak penggunaan nuklir di berbagai bidang. Namun, seiring banyaknya penggunaan teknologi nuklir maka limbah radioaktif yang dihasilkan semakin banyak juga, salah satunya uranium. Limbah yang mengandung uranium berbahaya bagi manusia dan lingkungan karena bersifat radioaktif. Berbagai macam metode telah dikembangkan untuk mereduksi jumlah cemaran logam berat uranium, salah satunya metode adsorpsi. Adsorben dari bahan alam telah banyak dikembangkan untuk adsorpsi ion logam uranium. Dalam penelitian ini, adsorben poli(asam akrilat)-g-selulosa/bentonit disintesis dengan metode pencangkokan dan kapasitas adsorpsi terhadap ion logam uranium serta model isoterm adsorpsinya ditentukan. Adsorben dikarakterisasi menggunakan spektroskopi fourier transform infrared (FTIR). Kapasitas adsorpsi diuji dengan variasi konsentrasi larutan awal uranium sebesar 5, 10, 50, dan 100 ppm menghasilkan kapasitas adsorpsi maksimum pada konsentrasi 100 ppm sebesar 39.76 mg/g. Model isoterm adsorpsi kemudian ditentukan dan dapat diketahui bahwa model isoterm adsorpsi untuk adsorben mengikuti model Freundlich.
Keyword: adsorbent, adsorption capacity, isotherm adsorption, radioactive waste

Judul: Synthesis of Cellulose-TiO2-g-Poly(acrylic acid)  through Graft Copolymerization Technique as U(VI) Ion Adsorbent.
Abstrak: Selulosa jerami sebagai adsorben logam berat memiliki kapasitas adsorpsi yang rendah sehingga perlu dimodifikasi. Penelitian ini bertujuan menyintesis selulosa-TiO2-g-poli(asam akrilat) sebagai adsorben dan mengaplikasikan dalam penentuan kapasitas dan isoterm adsorpsi terhadap ion U(VI). Selulosa diisolasi dari jerami padi, hasilnya dimodifikasi melalui kopolimerisasi cangkok lalu digunakan untuk adsorpsi dengan metode statis (batch). Konsentrasi awal dan akhir ion U(VI) diukur dengan spektrofotometer UV-Vis. Isolasi selulosa menghasilkan rendemen sebesar 26,73%. Sintesis adsorben menghasilkan persen pencangkokan sebesar 16,18%. Analisis spektrum FTIR menunjukkan asam akrilat tercangkok pada selulosa-TiO2 dengan munculnya gugus fungsi baru pada 1.683,93 cm-1 yang menunjukkan ulur C=O. Kapasitas adsorpsi optimal terhadap ion U(VI) diperoleh pada konsentrasi awal 70 ppm. Nilai R2 menunjukkan isoterm Freundlich pada permukaan yang heterogen. Nilai n > 1 mengimplikasikan terjadinya adsorpsi fisika. Kapasitas adsorpsi maksimum terhadap ion U(VI) sebesar 36,2319 mg/g. Produk modifikasi memiliki persen degradasi terhadap asam dan derajat pengembangan terhadap air yang kecil sehingga berpotensi sebagai adsorben yang efektif., Straw cellulose as heavy metal adsorbent has a low adsorption capacity so it needs to be modified. This study aims to synthesize cellulose-TiO2-g-poly(acrylic acid) as an adsorbent and apply it determine the adsorption capacity and isotherm of U(VI) ions. Cellulose was isolated from rice straw. The result was modified through graft copolymerization and then used for adsorption by the static method (batch). The initial and final concentrations of U(VI) ions were measured by UV-Vis spectrophotometer. Cellulose isolation resulted in a yield of 26.73%. The adsorbent synthesis resulted in a grafting percentage of 16.18%. FTIR spectrum analysis showed that acrylic acid was grafted onto cellulose-TiO2 with a new functional group appearance at 1,683.93 cm-1, namely C=O stretching. The adsorption capacity of the adsorbent to the optimal U(VI) ion at an initial concentration of 70 ppm. The value of R2 indicates the Freundlich isotherm on a heterogeneous surface. The value of n > 1 implies the occurrence of physical adsorption. The maximum adsorption capacity of the adsorbent to the U(VI) ion is 36.2319 mg/g. The modified product has a small percentage of degradation to acid and the degree of swelling to water so it is potential to be an effective adsorbent.
Keyword: adsorption, cellulose, graft copolymer, uranium, acrylic acid

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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