Judul: Optimisasi Adsorpsi Biru Metilena oleh Alofan dan Nanokomposit Alofan-TiO2 serta Uji Fotokatalisisnya
Abstrak: Allophane is a natural clay mineral with high adsorption capacity. This mineral often found in volcanic soil. Indonesia is one of the countries with many active volcanoes, so the probability to find the type of mineral is quite high. To improve their characteristics, allophane was made into nanocomposite with TiO2, the resulting a substance with adsoptive-photocatalyst characteristics. In this research, the adsorption of methylene blue was optimized based on two parameters, agitation time and mass of the adsorbent. The optimazed agitation time for the adsorption of methylene blue by allophane and nanocomposite allophane-TiO2 were obtained at 1.5 hours. The optimized mass of allophane and nanocomposite were 80 mg and 60 mg respectively. The synthesized-nanocomposite was shown to have the adsorptive-photocatalytic properties because it can degraded methylene blue after irradiated with ultraviolet light.
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Judul: Sintesis Nanokomposit Alofan/TiO2 dan Uji Fotodegradasi pada Zat Pewarna Biru Metilena
Abstrak: Industrial development has positive and negative impacts on the environment. The negative impact is environmental pollution by waste water containing dyes. Handling of this type of waste currently uses adsorption methods that give new problems, such as accumulation of environmentally hazardous adsorbents. This study applied a new concept of adsorption-photodegradation. This method was carried out by combining two materials into a nanocomposite, i.e. allophane and TiO2. Allophane is able to adsorb organic compounds, while TiO2 with ultraviolet light (UV), can degrade organic compounds. Allophane/TiO2 nanocomposite was prepared by mixing the constituents in its colloidal forms. The results showed that the adsorption capacity of the nanocomposite was greater than the capacity of allophane and TiO2 alone. The nanocomposite and allophane adsorption followed the Langmuir pattern. Photodegradation test on the nanocomposite irradiated with UV showed a new methylene blue wavelength on 573 nm, while controls that was carried out in dark room showed no shift in wavelength. Characterization using fourier transform infrared spectrometer showed a spectrum indicating the presence of allophane.
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Judul: Beberapa aspek anatomi alat sirkulasi ruang dada kancil
Abstrak: Telah dilakukan penelitian dengan menggunakan 10 ekor kancil dewasa jantan dan betina dengan tujuan untuk menge- tahui beberapa aspek anatomi alat sirkulasi di dalam ruang dada, meliputi jantung, pembuluh darah yang keluar dan ma- suk jantung serta ukuran-ukuran jantung. Kancil merupakan ruminansia terkecil di dunia, hidup di daerah tropika India, Thailand, Malaysia dan Indonesia bagian barat. Hewan ini dilindungi dan mempunyai prospek yang baik untuk hewan penelitian maupun dibudidayakan. Hasil penelitian menunjukkan bahwa berat jantung rаta-rata adalah 0.69% dari berat rata-rata kancil. Dan ini mirip pada jantung kuda dan anjing. Bentuk jantung lonjong seperti halnya ruminansia. Demikian pula letaknya di dalam ruang dada seperti pada ruminansia dengan adanya Ligamentum sternopericardiacum. Di dalam ventrikel kanan membersit sebuah Musculus (M.) papillaris dari dindingnya dan tiga sampai empat Musculi (Mm.) papillares dari Septum interventriculare. Hanya dua buah Mm. papillares yang berukuran besar dibersitkan dari dinding ventrikel kiri. Percabangan Arteri (A.) coronaria sinistra lebih dominan dari pada A. coronaria dextra. Sedangkan A. sub clavia sinistra dicabangkan langsung dari aorta di dorso- caudal pembersitan Truncus (Tr.) brachiocephalicus…
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