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All Journal E-Journal Widya Kesehatan dan Lingkungan Chimica et Natura Acta Makara Journal of Technology
Yohan Yohan
The State Ministry of Research and Technology, Gedung II BPPT Lt. 8 – Jl. M.H. Thamrin 8 Jakarta 10340 Faculty of Fishery – University of Satya Negara Indonesia, Jl. Arteri Pondok Indah No. 11 Jakarta 12240
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Environmental Science Materials Science & Nanotechnology Mechanical Engineering Public Health

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PENGOLAHAN AIR LIMBAH INDUSTRI : PREPARASI DAN KARAKTERISASI KOPOLIMER CANGKOK ASAM AKRILAT PADA FILM HDPE Yohan, Yohan; Nur, Rifaid M.; Hendrajaya, Lilik; Siraj, E. S.
E-Journal Widya Kesehatan dan Lingkungan 2005
Publisher : E-Journal Widya Kesehatan dan Lingkungan

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Grafting pre-irradiation process of styrene monomer on high desity poluethylene (HDPE) film for hydrophilic membrane as membrane of cationic exchanger have been done. HDPE film is irradiated by y-ray then grafted by acrylic acid monomer in water. The preparation conditions at which the optimum grafting process are determined, such as rate and total dose of irradiation, monomer concentration, time and temperature of grafting. Characterization of some properties of the prepared grafted membranes were studied and accordingly the possibility of its practical use in fuel cell and in waste water treatment from toxic heavy metals, such as As, Cd, Co, Cu, Fe and Pb was investigated. Good relative condition to graft was using total dose of 45 kGy, dose rate was 7 kGy/hour, acrylic acid was 40% volume, grafting time was 90 minutes, and grafting temperature was 70oC gave percent of grafting HDPE-g-AA = 800-900% weight. The chelated metal ions were easily desorbed by treating the membrane with 0.1N HCl for 2 hours at room temperature. Finally, a mixture of there metals in the same feed solution was used to determine the selectivity of the membrane toward different metals. The results obtained for the prepared membranes showed a promise for their applicability in the removal of heavy metals from industrial wastewater.
DETEKSI URUTAN OLIGONUKLEOTIDA Mycobacterium tuberculosis SECARA VOLTAMMETRI MENGGUNAKAN SCREEN PRINTED CARBON ELECTRODE (SPCE) Hartati, Yeni Wahyuni; Yohan, Yohan; Nurmalasari, Ratna; Gaffar, Shabarni; Lubis, Rubianto A.
Chimica et Natura Acta Vol 4, No 2 (2016)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (204.19 KB) | DOI: 10.24198/cna.v4.n2.10674

Abstract

Mycobacterium tuberculosis merupakan bakteri penyebab tuberkulosis (TB). Pengembangan analisis secara biosensor DNA sangat menarik perhatian karena penerapannya mudah. Dalam penelitian ini telah dilakukan penentuan urutan pendek oligonukleotida M. tuberculosis gen RV0508 dari strain H37RV secara voltammetri pulsa differensial menggunakan screen printed carbon electrode (SPCE). Pendeteksian berdasarkan teknik hibridisasi urutan oligonukleotida probe yang diadsorpsi pada permukaan SPCE, dengan pasangan komplementernya dari DNA target, tanpa indikator hibridisasi, yaitu dengan mensubstitusi basa guanin probe dengan basa inosin. Respon hibridisasi berupa signal guanin DNA target di daerah potensial sekitar +0,9 V. Telah diperoleh korelasi linear antara arus puncak dengan konsentrasi DNA target pada rentang 5,0-20,0 µg/mL dengan batas deteksi 8,2 µg/mL.
Synthesis of Fuel Cell Membrane: Copolymerization of Styrene on ETFE Film by Grafted pre-Irradiation Yohan, Yohan; Nur, Rifai M.; Hendrajaya, Lilik; Siradj, E. S.
Makara Journal of Technology Vol. 9, No. 2
Publisher : UI Scholars Hub

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Synthesis of Fuel Cell Membrane: Copolymerization of Styrene on ETFE Film by Grafted pre-Irradiation. Preirradiation Grafting styrene monomer on ETFE film has been prepared. Research has been performed by γ-ray radiation at various total dose from 2.5 – 12.5 kGy and various dose rate from 1.3 – 1.9 kGy/hour. Irradiated copolymer is then grafted by styrene monomer in various solvent: ethanol, 2-propanol, and toluene, various concentration from 20 – 70% volume, various temperature from 50 – 90oC, and various grafting time from 2 – 12 hours. The results showed that percent of grafting is increase with increase of total dose and decrease of rate dose. The optimum experiment conditions are obtained at total dose 10 kGy, dose rate 1,9 kGy/hour, 2-propanol solvent, 40% volume styrene, 4 hours grafting time, and 70oC grafting temperature.
Sulfonation of cPTFE Film grafted Styrene for Proton Exchange Membrane Fuel Cell Yohan, Yohan
Makara Journal of Technology Vol. 11, No. 1
Publisher : UI Scholars Hub

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Sulfonation of cPTFE Film grafted Styrene for Proton Exchange Membrane Fuel Cell. Sulfonation of γ-ray iradiated and styrene-grafted crosslinked polytetrafluoroethylene film (cPTFE-g-S film) have been done. The aim of the research is to make hydropyl membrane as proton exchange membrane fuel cell. Sulfonation was prepared with chlorosulfonic acid in chloroethane under various conditions. The impact of the percent of grafting, the concentration of chlorosulfonic acid, the reaction time,and the reaction temperature on the properties of sulfonated film is examinated. The results show that sulfonation of surface-grafted films is incomplete at room temperature. The increasing of concentration of chlorosulfonic acid and reaction temperature accelerates the reaction but they also add favor side reactions. These will lead to decreasing of the ion-exchange capacity, water uptake, and proton conductivity but increasing the resistance to oxidation in a perhidrol solution. The cPTFE-g-SS membrane which is resulted has stability in a H2O2 30% solution for 20 hours.
Co-Authors E. S. Siradj E. S. Siraj Lilik Hendrajaya Lubis, Rubianto A. Nur, Rifai M. Nurmalasari, Ratna Rifaid M. Nur Rifaid Nur, Rifaid Shabarni Gaffar -, Shabarni Gaffar Yeni Wahyuni Hartati