Judul: Sintesis Zeolit dan Nanokomposit Zeolit/TiO2 dari Abu Layang dan Waterglass serta Uji Adsorpsi dan Fotodegradasinya
Abstrak: Coal fly ash contains 20.74% Si and 4.09% Al, rendering its possibility to be synthesized to zeolite. Zeolite was synthesized by smelting at 550 °C, and continued with hydrothermal method at 90 °C for 6 hours. The weighed fly ash was melted with solid NaOH and various amounts of waterglass at 550 °C for 1 hour, which were coded ZK1 for 1.0 g of waterglass added, ZK2 (1.5 g), ZK3 (2.5 g), ZK4 (5.0 g), and ZK5 (7.5 g). The results indicated that the zeolite has the character as type P1. ZK1 zeolite had the highest crystallinity (65%), therefore it was used further to synthesize zeolit/TiO2 nanocomposite. The nanocomposite was formed to improve the zeolite characters, especially adsorption-photodegradation capacity. The synthesized zeolite and the nanocomposite were tested for their adsorption capacities. The results showed that the ZK1 has the highest adsorption capacity, i.e. 147 mg/g. Optimization was performed on ZK1 and zeolit/TiO2 nanocomposite to compare their adsorption capacity and to determine their optimum conditions for adsorption. The optimum concentration of adsorbate that can be adsorbed by ZK1 was obtained at 400 ppm using 0.02 g adsorbent, with the adsorption time of 3 hours. Zeolite/TiO2 nanocomposite has optimum concentration of 250 ppm with the weight of adsorbent of 0.01 g, and the adsorption time of 1 hour. The nanocomposite zeolite was able degrade methylene blue under ultraviolet radiation for 6 hours at λ=365 nm.
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Judul: Sintesis Zeolit X Dan Nanokomposit Zeolit/TiO2 Dari Kaolin Dengan Sekam Padi Sebagai Sumber Silika
Abstrak: Zeolite X was synthesized from kaolin originated from Bangka Belitung and was added with silica from rice husk ash. Zeolite X was synthesized because it has many benefits, including as an adsorbent. Kaolin was used as raw material due to its high content of silica and alumina, which were 48.03% and 35.50% respectively. Meanwhile, silica from rice husk ash was used in the form of sodium silicate. Zeolite was synthesized through hydrothermal process inside a polypropylene bottles, by mixing metakaolin, the calcined form of kaolin heated at 700 °C for 6 hours, with sodium silicate and NaOH to activate the major components of Si and Al in the kaolin. Hydrothermal processes were carried out at 100 °C for 24 hours with NaOH concentrations of 1.5 N and 2.5 N. The concentration of NaOH used was resulted in certain type of zeolite obtained. Zeolite X was obtained when the addition 2.5 N NaOH with NaP1 and Faujasite as impurities. On the other hand, NaOH 1.5 N gave NaP1 zeolite. Modification of zeolite to nanocomposite zeolit/TiO2 was shown to have better capability, that was adsorption-photocatalytic property due to its ability to degrade methylene blue under ultraviolet light.
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Judul: Analisa Prestasi Kuda Pacu Pada Kejuaraan Nasional Pacuan Derby Indonesia Tahun 1974-2015
Abstrak: Olahraga berkuda memerlukan ternak kuda yang bermutu tinggi dan terlatih dengan baik. Oleh karena itu, organisasi nasional bernama PORDASI (Persatuan Olah Raga Berkuda Indonesia) melakukan program grading up kudakuda lokal Indonesia. Program grading up telah dilakukan selama 41 tahun yang lalu sampai sekarang dan perlu dilakukan ulasan atas program tersebut. Tujuan dari penelitian ini adalah untuk menganalisis prestasi kuda pacu Indonesia pada kejuaraan nasional derby Indonesia tahun 1974-2015. Data yang digunakan merupakan data sekunder dari 111 ekor kuda yang menempati posisi 1, 2, dan 3. Penelitian ini menggunakan metode deskriptif. Kuda Generasi ke-4 (G4) memiliki prestasi paling banyak dibanding kuda peranakan Thoroughbred lainnya. Kuda ini mendominasi pacuan pada jarak 2 000 meter. Asal tetua pejantan dari Thoroughbred Australia dan betina lokal priangan paling banyak menghasilkan kuda juara pacuan Derby Indonesia. Persentase jenis kelamin jantan dan betina untuk posisi finish ke 1,2, dan 3 tidak terlalu berpengaruh pada prestasi kuda. Kuda dengan persentase darah Thoroughbred lebih tinggi berpeluang untuk berprestasi pada jarak pacu yang lebih jauh.
Keyword: grading up, jarak pacu, jenis kelamin, prestasi, Thoroughbred