Judul: Penjerapan zat warna rreaktif cibacron red menggunakan adsorben sekam padi
Abstrak: Textile wastewater containing dyes can pollute aquatic environment. This study utilized rice husk as adsorbent for Cibacron Red reactive dyes which are widely used in textile industries. Husks were made into adsorbent without modification (ATM) and acid modified adsorbent (AMA). The optimum condition was obtained under adsorption time of 30 minutes, 1.0 g of adsorbent, and initial concentration of dye solution was 150 ppm. The optimum condition for AMA was obtained under adsorption time of 60 minutes, 2.0 g of adsorbent, and 150 ppm initial concentration of dye solution. The optimum condition of activated charcoal (AA) as a comparison was 30 minute time of adsorption, 3.0 g of adsorbent, and 150 ppm initial concentration dye solution. Adsorption capacity of ATM, AMA, and AA at the optimum conditions was 2879.00, 6898.30, and 2470.00 μg/g, respectively. Adsorption efficiency of ATM, AMA, and AA at the optimum conditions was 19.86, 91.71, and 40.51%, respectively. All three types of adsorbent followed the Freundlich isotherm. Application of the adsorbent on waste of textile manufacture showed a decrease in colour after adsorption by ATM, AMA, and AA, up to 52.05, 98.86 and 48.69%, respectively, with the initial colour intensity of 1485 Pt-Co. Starting with COD of the wastewater which was 7372.0 mg/L, the values decreased after the adsorption with ATM, AMA, and AA were 43.30, 98.56 and 52.58%, respectively. Starting with BOD of 149.09 mg/L, the values decreased after adsorption by ATM, AMA, and AA were 63.41, 76.09, and 72.46%, respectively. Based on these results, rice husk is potentially used as an adsorbent of dyes, thereby reducing the level of pollution of aquatic environment.
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Judul: Baggase as cibacron red reactive dye adsorbent.
Abstrak: Cibacron Red is one of reactive dye types which is widely used by textile industry. But, reactive dye waste from textile industrial process causes many environment problems. Lots of waste treatment efforts are conducted; one of which is to make use of agricultural side products that are potential to be utilized as adsorbent. This research utilizes baggase as Cibacron Red reactive dye adsorbent. Baggase was divided in two categories, unmodified adsorbent and concentrated-sulphuric-acid-modified adsorbent. As a comparison, activated carbon that originated from coconut shell, which is commercially-used adsorbent, was used. Adsorption was carried out by varying adsorption times, adsorbent weights, and initial concentrations of Cibacron Red reactive dye; where then the results were applied to textile industrial waste. The optimum adsorption time, adsorbent weight, and initial concentration for unmodified adsorbent were 45 minutes, 1 g, and 150 ppm, respectively. On the other hand, the optimum conditions for acid-modified adsorbent were 53.5 minutes, 2.5 g, and 150 ppm. The optimum conditions for activated carbon, as comparison, were 60 minutes, 3 gram, and 150 ppm. In single solution tests of Cibacron Red, adsorption capacity for unmodified adsorbent, acid-modified adsorbent, and activated carbon were 788.7, 5669.6, dan 3827.5 μg/g adsorbent; with adsorption efficiency were 6.2, 94.1, dan 75.6% correspondingly. Application of three types of adsorbent toward textile industrial waste showed adsorption efficiency were 1.3, 97.6, and 51.7% in that order. Isotherm type for all types of adsorbent followed Freundlich isotherm.
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Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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