Judul: Adsorpsi ion Cr3+ oleh serbuk gergaji kayu Albizia (Albizzia falcata): Studi pengembangan bahan alternatif penjerap limbah logam berat
Abstrak: The aims of this research were to know (1) optimum time that is needed for Cr3+ ions adsorbed by sawdust of albizia wood, (2) characteristic of Cr3+ ions adsorbed by sawdust of albizia wood, and (3) the adsorption capacity of unactivated sawdust of albizia wood (Albizzia falcata) and activated by ethanol–toluene (1:1) toward Cr3+ ions. Consentration of Cr3+ was measured by using Atomic Absorption Spectrophotometer (AAS). The results of this research showed that, optimum time of adsorption Cr3+ by sawdust albizia wood was 60 hours, characteristic of Cr3+ ions by unactivated of sawdust of albizia wood followed the model of adsorption Langmuir isotherm, but did not follow adsorption Freundlich isotherm. Conversely, activated sawdust of albizia wood follow Langmuir and Freundlich isotherm. Adsorption capacity of activated sawdust was better than that of unactivated sawdust. The maximum adsorption of unactivated and activated sawdust of albizia wood was 1.56 mg/g and 2.21 mg/g, respectively.
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Judul: Limbah Arang Sekam Padi Sebagai Adsorben Ion Cr(III) dan Cr(VI)
Abstrak: The major sources of heavy metal contaminations are industrial effluents. Chromium metal and its compound have wide application in industrial sector. Its two most stable states are Cr(III) and Cr(VI). Trivalent chromium toxicity is negligible because it often forms insoluble hydroxide at netral pH. Hexavalent chromium is considered powerful carcinogenic agent Lots of waste treatment efforts are conducted; one of which is to make use of agricultural by products that are potential to be utilized as adsorbent. This paper utilizes carbonized rice husk from rice husk stove as Cr(III) and Cr(VI) adsorbent. Carbonized rice husk was activated potassium hydroxide (KOH). As a comparison, activated carbon that originated from coconut shell, a commercially-used adsorbent, was used. Adsorption was carried out by varying adsorption time, adsorbent weight, and initial concentrations of Cr(III) and Cr(VI). The optimum condition of carbonized rice husk adsorbent for Cr(III) and Cr(VI) were 60 minutes; 0.5 g; and 250 ppm. The optimum conditions for activated carbon, as comparison, for Cr(III) were 90 minutes; 0.5 g; and 250 ppm. And the optimum conditions for activated carbon, as comparison, for Cr(VI) were 90 minutes; 0.5 g; and 250 ppm. In single solution test of Cr(III) and Cr(VI), adsorption capacity for carbonized rice husk were 8.400 mg/g; with adsorption efficiency were 84.00 %.
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Judul: Penerbangan Otomatis Pesawat Tanpa Awak Jenis Sayap Tetap dengan iNav
Abstrak: Pesawat tanpa awak (UAV) dapat dikendalikan secara manual dengan remote control atau secara otomatis dengan flight controller (FC). Salah satu jenis UAV adalah sayap tetap yang memiliki bentuk seperti pesawat terbang pada umumnya. Penelitian ini bertujuan untuk melakukan penerbangan otomatis pada UAV jenis sayap tetap dengan mengkonfigurasi perangkat FC. UAV yang digunakan adalah model SkySurfer X8 dengan bentang sayap 1.4 m. FC yang digunakan adalah Matek F405-Wing yang dikonfigurasi dengan perangkat lunak iNav. Berdasarkan hasil uji terbang, UAV berhasil terbang secara otomatis mengikuti skenario yang diberikan. Skenario terjauh berupa persegi berukuran 600×600 m pada ketinggian 100 m, yang ditempuh dalam waktu sekitar 2 menit dengan kecepatan sekitar 65 km/jam. Diharapkan prosedur perakitan, konfigurasi, operasi, dan hasil data uji terbang dapat menjadi acuan dalam penelitian selanjutnya.
Keyword: iNav, penerbangan otomatis, pesawat tanpa awak, sayap tetap