Methylene blue (MB) is a blue cationic thiazine dye which is widely used in cotton fiber, wood and textile industries, but has an adverse effect to environment and living organism. It is urgent to find an alternative and effective solution for this recalcitrant compound. The Fenton process-based advanced oxidation process is considered as an effective method for the degradation of organic contaminants such as dyes. In this study, the composite α-MnO2/activated carbon (AC) was first synthesized by a facile, one-pot synthesis using sol-gel method and characterized by X-ray diffraction (XRD) and BET surface areas. The XRD results indicated that the tunnel cryptomelane-type manganese oxide (α-MnO2) was successfully synthesized as the minor phase in the activated carbon support. The composite α-MnO2/AC has higher specific surface area than the single α-MnO2. The catalytic studies indicated that the α-MnO2/AC has a much higher catalytic efficiency over single α-MnO2 for degradation of MB. The presence of the support and the increase in surface area of α-MnO2/AC could be responsible for its higher catalytic efficiency compared to single α-MnO2. In the optimum condition, the α-MnO2/AC was able to degrade 98.48 % and 99.2 % of MB within 10 and 120 minute of reaction time, respectively.
Perhitungan komputasi berbasis website yang tidak berbayar dan dapat diakses oleh siapapun akan berperan sangat penting dalam pembelajaran kimia komputasi bagi pemula. Pada penelitian ini, kami telah melakukan optimasi struktur kompleks Cu(II)-fenantrolin (Cu(II)-phe2) menggunakan perangkat lunak GAMESS pada kluster komputer San Diego Supercomputing Center (SDSC) melalui www.chemcompute.org. Hasil perhitungan komputasi menunjukkan bahwa kedua ligand fenantrolin tidak berada pada satu bidang datar, tetapi membentuk sudut 35,4º.
ABSTRAKTelah dilakukan penelitian tentang peningkatan mutu minyak goreng curah menggunakan adsorben lempung asal Desa Gema, Kabupaten Kampar, Provinsi Riau. Penelitian ini meliputi: (1) Pembuatan adsorben dengan aktivasi menggunakan H2SO4 0,5 M, selama 3 jam dengan kecepatan pengadukan 500 rpm (2) Pemurnian minyak goreng secara adsorbsi dan mengetahui mutu minyak curah setelah adsorbsi berupa bilangan peroksida, bilangan asam, kandungan air, warna. Proses adsorpsi diamati dengan variasi massa (1, 3, 5, dan 7 gram) dengan waktu kontak 30 menit. Semua nilai yang diperoleh dibandingkan dengan SNI 3741:2013. Hasil yang didapat menunjukkan lempung teraktivasi H2SO4 mampu menurunkan bilangan peroksida, bilangan asam, dan kandungan air secara maksimal masing-masing sebesar 31,02%, 36,36%, dan 38,89% dengan 7 gram lempung teraktivasi.Kata kunci: Lempung, adsorpsi, aktivasi, bilangan peroksida, dan bilangan asam
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