Judul: Optimasi Zeolit Alam TermodifikasiFe(OH)3 sebagai Penukar Anion
Abstrak: Activation and modification with Fe(OH)3 can increase the ability of zeolite as anion exchanger. Activation were carried out with HCl concentration of 2, 4, 6, and 8 M with variation of agitation time of 60, 90, and 120 minutes. Optimum condition was determined from the highest anion exchange capacity (AEC), that was 4 M of HCl and contact time of 90 minutes with AEC value of 15.71 meq/100 g. Optimum condition of zeolite modification with Fe(OH)3 was 1.5 g of zeolite weight, 0.1 M of Fe(OH)3 concentration, 120 minutes of contact time, and 24 hours of aging time. The AEC and cation exchange capacity (CEC) obtained in this optimum condition were 21.82 and 100.80 meq/100 g, respectively. Adsorption of Fe(OH)3 into activated zeolite surface data was fitted to Langmuir adsorption isoterm. Phenol was used for batch adsorption studies of optimum Fe(OH)3modified zeolite. The sorption efficiency (%) and sorption capacity of this zeolite were increased linearly with phenol concentration. The amount were 3.69% and 2.01 mg/g, respectively at 80 ppm of phenol. Increment in AEC value as well as still high CEC value in Fe(OH)3-modified zeolite is potencial to be utilized as adsorbent or ion exchanger for waste with negative or positive charge or combination of both.
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Judul: Modifikasi zeolit melalui interaksi dengan Fe(OH)3 untuk meningkatkan kapasitas tukar anion
Abstrak: Zeolite structure, that bears negative charge caused by replacement of Si with Al in the process of its formation, makes the zeolite has a function as cation exchanger and some anion exchange. To improve its anion exchange properties, zeolite can be modified by addition of Fe(OH)3. Fe3+ ions will enter empty cavities of the zeolite and bind the anions (ligands) to form complexes. Based on the esperiment, the modified zeolite with Fe(OH)3 can be made from both natural and active zeolites, increasing the anion exchange capacity of the zeolite. The anion exchange capacity of the modified zeolite was higher that of the zeolite before modification,i.e. 5.064 and 17.449 meq/100 g, respectively. Modification of zeolite with Fe(OH)3 inhibited adsorption of methylene blue, due to structural changes in the nature of the zeolite after modification. Zeolite adsorption capacity from methylene blue were the largest on the unmodified active zeolite, which was 0.7199 mg/g.
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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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