Judul: Adsorpsi biru metilena pada metakaolin dan nanokomposit metakaolin-TiO2 serta uji fotokatalisis
Abstrak: One method used for handling organic dyes in wastewater is adsorption-photodegradation. This method is based on adsorption of the organic compound by the surface of a solid material that subsequently degrades the organic compound. Clay materials such as kaolin are commonly used as the adsorbent. High temperature heating of kaolin damages its structure and forms amorphous metakaolin. However, metakaolin is rarely used as adsorbent due to its low adsorption capacity. Therefore, modification was done on metakaolin to obtain a nanocomposite by physically mixing metakaolin with TiO2 anatase. In this study metakaolin was formed from Bangka Belitung kaolin by calcinations at temperatures of 550 and 700 ˚C for 3 and 6 hours for a total of four treatments. The study showed that the adsorption capacity decreased with increasing calcination temperature. Metakaolin calcined at 550 ˚C for 3 hours was used to create metakaolin-TiO2 nanocomposite using TB3 as binder with a metakaolin:binder:TiO2 mixing ratio of 6:3:1. The adsorption capacity of the nanocomposite was slightly lower than that of the metakaolin at 13.26 and 14.76 mg/g, respectively. This nanocomposite successfully photodegraded the methylene blue compound.
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Judul: Nanokomposit kaolin-TiO2 dengan dopan urea untuk adsorpsi dan fotodegradasi zat warna biru metilena
Abstrak: Methylene blue is one type of dyes found as pollutant in Indonesia water system. Kaolin-TiO2 nanocomposite was synthesized and used to overcome this problem by utilizing its adsorption-photodegradation mechanism. Kaolin-TiO2 nanocomposite was made by mixing kaolin powder and TiO2 powder physically using ball milling and paste methods. The ball milling method is found to be simpler than paste method, and also resulting in smaller particle size. Smaller particle size also found to increase both adsorption and photodegradation activities. It is believed that ball milling method also generated a homogenous mixture. From 2 different sample compositions and 3 milling times used, it was found that synthesis kaolin-TiO2 nanocomposite requiring calciumbased binder with an optimum milling time of 5 hours. Kaolin-TiO2 nanocomposite was doped with urea by manual physical mixing followed by calsination at 300 °C for 2 hours. Urea doped-nanocomposite has larger activity than undoped nanocomposite in visible light zone. It means that the photocatalytic activity of urea doped-nanocomposite was successfully shifted to the red zone area of the visible light. Therefore, incident sunlight can be used as energy source in the adsorption-photodegradation process using nanocomposite Kaolin-TiO2.
Keyword: adsorption, ball milling, kaolin, methylene blue, photodegradation

Judul: Analisis pengendalian pasokan pisang cavendish berdasarkan hasil ramalan penjualan Time Series terbaik untuk wilayah pemasaran Jabotabek pada PT.Sewu Segar Nusantara
Abstrak: Pisang di Indonesia ada beberapa jenis antara lain pisang ambon, pisang raja, pisang barangan, pisang cavendish, dan beberapa pisang lainnya yang disesuaikan dengan nama daerah asalnya. Pisang cavendish merupakan salah satu jenis pisang yang dikonsumsi oleh 80 % total konsumen luar negeri. Pisang cavendish (Musa cavendishii) sudah dibudidayakan di Indonesia, namun bukan merupakan jenis pisang asli Indonesia. Pisang cavendish berasal dari Negara Brazil dan masuk ke Indonesia pada tahun 1990-an. Salah satu perusahaan yang memproduksi pisang cavendish di Indonesia adalah PT. Nusantara Tropical Fruit (PT. NTF) yang berada di daerah Lampung. PT. NTF hanya memproduksi pisang cavendish, sedangkan distribusi dan penjualannya dilakukan oleh PT. Sewu Segar Nusantara (PT. SSN) yang berada di daerah Tangerang. PT. SSN merupakan distributor pisang cavendish dengan merek dagang Sunpride untuk ritel modern, merek Sunfresh untuk non-ritel modern, dan non-merek lainnya. Pangsa pasar pisang cavendish merek Sunpride merupakan yang terbesar bagi perusahaan yaitu sebanyak 50 persen dan selebihnya merek Sunfresh dan jenis lainnya. Perusahaan menetapkan pasar ritel modern sebagai pasar terbesarnya, karena jenis pisang ini lebih diminati oleh konsumen middle-up. Dalam manajemen distribusi pisang cavendish pada PT. SSN memiliki keterkaitan yang sangat erat dengan PT. NTF. Hal ini terlihat jika pasokan pisang cavendish tidak dalam jumlah banyak dari PT. NTF, maka secara langsung pesanan yang dikirim kepada pelanggan oleh PT. SSN akan sedikit.
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