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: 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: Karakteristik Habitat, Populasi, Dan Sebaran Bajing kelapa Callosciurus notatus boddaert, 1785) di Kampus IPB Dramaga Bogor
Abstrak: Kampus IPB Dramaga Bogor merupakan salah satu kawasan dengan nilai keanekaragaman hayati yang tinggi. Berbagai macam kelas satwa dapat ditemui tersebar luas di seluruh kawasan, salah satunya adalah bajing kelapa (Callosciurus notatus) dari kelas mamalia. Penelitian karakteristik habitat, populasi, hingga sebaran perlu dilakukan sebagai data yang dapat mendukung kelimpahannya di Kampus IPB Dramaga. Penelitian ini dilakukan pada Januari hingga Agustus 2022, dengan metode analisis vegetasi, pengamat diam, dan secara survei. Jumlah habitat tempat bajing kelapa melakukan aktivitas hariannya ditemukan sebanyak 56 tumbuhan di lapangan, Kelapa sawit (Elaeis guineensis) dan palem raja (Roystonea regia) merupakan jenis pohon yang paling banyak dimanfaatkan bajing kelapa. Keseluruhan populasinya sendiri mencapai 319 individu tersebar di 20 lokasi yang berbeda, dengan Perumahan Dosen sebagai lokasi dengan jumlah penemuan terbanyak, berukuran 46 individu. Kepadatannya di seluruh Kampus IPB Dramaga adalah 1,24 ind/ha. Perbandingan struktur umur remaja memiliki area yang lebih luas dibanding dewasa, mengartikan bahwa populasi bajing kelapa masih akan terus bertumbuh dalam keadaan baik.
Keyword: bajing kelapa, kampus ipb dramaga, karakteristik habitat, populasi, sebaran