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All Journal Jurnal Sains dan Seni ITS IPTEK The Journal of Engineering JFA (Jurnal Fisika dan Aplikasinya) Indonesian Journal of Electrical Engineering and Computer Science
Suprapto Suprapto
Institut Teknologi Sepuluh Nopember
Arts Humanities Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Engineering Mechanical Engineering Physics

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PEMISAHAN ALUMINA PADA RESIDU BAUKSIT (RED MUD) YANG BERASAL DARI RIAU DENGAN METODE SINTERING SODALIME Suprapto Suprapto; Retty Dwi Kisnawati
Jurnal Sains dan Seni ITS Vol 5, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (305.119 KB) | DOI: 10.12962/j23373520.v5i2.19633

Abstract

Penelitian mengenai pemisahan alumina melalui metode sintering sodalime menggunakan natrium karbonat (Na2CO3) dan kalsium oksida (CaO) yang diikuti dengan ekstraksi menggunakan larutan Na2CO3 pada residu bauksit (red mud) yang berasal dari Riau telah dilakukan. Berdasarkan hasil XRD dan XRF, dalam red mud terkandung aluminium sebesar 24%. Kadar aluminium dalam sampel dianalisis menggunakan ICP-OES. Sintering dilakukan pada suhu 800°C. Hasil sinter kemudian dilarutkan menggunakan Na2CO3 0,1 M sehingga menghasilkan natrium aluminat (NaAlO2). Filtrat yang diperoleh dipresipitasi menggunakan HCl dengan kontrol pH larutan 6,5-7 sehingga diperoleh endapan putih. Pada penelitian ini, rasio antara red mud:Na2CO3:CaO berturut-turut 1,5:2,5:1,25 menghasilkan kadar Al2O3 sebesar 16,94% dengan recovery 69,5%. Kadar dan recovery Al2O3 juga dipengaruhi oleh waktu sintering. Pada penelitian ini waktu sintering yang optimum yaitu 1 jam. Pada kondisi tersebut diperoleh kadar Al2O3 25,69% dengan recovery 97,35%.
Pengaruh pH dan Waktu Kontak Pada Adsorpsi Remazol Brilliant Blue R Menggunakan Adsorben Ampas Singkong Asr Wajarwati Khair Wahyuningsih; Ita Ulfin; Suprapto Suprapto
Jurnal Sains dan Seni ITS Vol 7, No 2 (2018)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat (LPPM), ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (291.783 KB) | DOI: 10.12962/j23373520.v7i2.30070

Abstract

Adsorpsi Remazol Brilliant Blue R oleh adsorben ampas singkong telah dilakukan. Adsorpsi dilakukan dengan metode batch pada variasi pH 1-10 dan waktu kontak 5-90 menit. Dari hasil penelitian didapatkan bahwa kondisi optimum adsorpsi terjadi pada pH 1 dan waktu kontak selama 45 menit dengan konsentrasi awal 200 mg/L. Sehingga diperoleh kapasitas adsorpsi optimum sebesar 16,878 mg/g dan persentase adsorpsi 87,413 %.  
Design and Fabrication of All Organic Field Effect Transistor Suprapto Suprapto; Krishna C. Persaud
Jurnal Fisika dan Aplikasinya Vol 7, No 1 (2011)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (497.972 KB) | DOI: 10.12962/j24604682.v7i1.898

Abstract

All organic field effect transistor consist of poly-3-hexyloxythiophene, undoped poly-3,3”-didecyl-2,2’,5’,2”-terthiophene and polypyrrole has been successfully developed. Poly-3-hexyloxythiophene was applied as gate material. Undoped poly-3,3”-didecyl-2,2’,5’,2”-terthiophene was used as insulating layer and polypyrrole was applied as source-drain material. The multilayer polymers were deposited onto gold source-drain and gate electrodes by electropolymerization method. The spaces between the gold electrodes were 50 μm. The transistor shows a current amplification upon increasing gate voltages. Good conductivity stability upon increasing gate voltages was observed. Overall the field effect transistor has properties that similar to inorganic field effect transistor.
A Novel Selective and Sensitive Electrochemical Sensor for Insulin Detection Zulkarnain Zulkarnain; Suprapto Suprapto; Taslim Ersam; Fredy Kurniawan
Indonesian Journal of Electrical Engineering and Computer Science Vol 3, No 3: September 2016
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/ijeecs.v3.i3.pp496-502

Abstract

A novel selective and sensitive electrochemical sensor for insulin detection has been fabricated and investigated. The electrochemical sensor was made from a mixture of silica gel, chitosan and nickel hydroxide (Ni(OH)2) nanoparticles, which was mounted on a silver wire and covered by a glass tube (silica gel/chitosan/Ni(OH)2 nanoparticles paste electrode). The sensor was characterized using cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). The anodic and cathodic currents of the silica gel/chitosan paste electrode with Ni(OH)2 are 580 mA and -750 mA, respectively. Without Ni(OH)2, however, the currents are 150 mA and -250 mA, respectively. The sensitivity and limit of detection of the silica gel/chitosan/Ni(OH)2 nanoparticle paste electrode for insulin detection are 5573 × 10­5pA/pMcm2 and 0.25 pM, respectively. The sensor also shows good reproducibility of measurement for 35 days with an RSD of 0.29%. The fabricated electrodes also show good reproducibility, with an RSD of 1.39%.
Effect of Steam Delignification and Bleaching Process on Pineapple Leaf Fiber as Textile Raw Material Warlinda Eka Triastuti; Suprapto Suprapto; Agus Surono; Mochammad Zayyan Difa Fadhillah; Regita Syahra Ramadhan; Sunia Rahma Cahyaning Tyas; Hanifah Fauziyah Zahrah
IPTEK The Journal of Engineering Vol 9, No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v9i2.a17325

Abstract

Pineapple is a local commodity in Indonesia that is widely cultivated. The part of the pineapple plant that is mostly used is only the fruit part, while the other plant parts are discarded and become waste. Pineapple leaves contain high fiber content of cellulose, lignin, and hemicellulose, so it is very potential if used as an alternative textile raw material. The quality of pineapple leaf fiber can be improved by going through a delignification process using an alkaline solvent with the appropriate concentration and time. This research  determine the effect of delignification of pineapple leaf fiber with a solution of Sodium Hydroxide (NaOH), Hydrogen Peroxide (H2O2) and water (H2O) on tensile strength, lignin content and Scanning Electron Microscope (SEM). This research consist of six stages including delignification using 3% NaOH and 3% H2O2, washing, neutralization, preservation, and analysis of pineapple leaf fiber products. The results obtained are pineapple leaf fiber lignin test after delignification and bleaching, the best lignin results are steam delignification at 80°C with 3% NaOH solution and bleaching solution using NaOCl solution obtained 21% lignin content with a tensile strength test of  0.263 kgf/mm2. SEM analysis also showed that there was a loss of material from the fiber surface which indicated that there was degradation due to the addition of bleaching solution. This proves that alkaline treatment can also cause discoloration of natural fibers due to the removal of natural dyes in natural fibers.
Co-Authors Agus Surono Asr Wajarwati Khair Wahyuningsih Fredy Kurniawan Hanifah Fauziyah Zahrah Ita Ulfin Krishna C. Persaud Mochammad Zayyan Difa Fadhillah Regita Syahra Ramadhan Retty Dwi Kisnawati Sunia Rahma Cahyaning Tyas Taslim Ersam Triastuti, Warlinda Eka Zulkarnain Zulkarnain