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All Journal Jurnal Teknik Kimia USU Dewantara Journal of Technology Jurnal Teknik Kimia USU Journal Of Chemical Process Engineering
Majid, Rafdi Abdul
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology

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Pemanfaatan Asap Cair Hasil Pirolisis Batubara sebagai Pestisida Organik pada Rayap (Coptotermes curvignathus Holmgren) Arman, Muh; Bakri, Suriyanto; Majid, Rafdi Abdul
Jurnal Teknik Kimia USU Vol. 10 No. 2 (2021): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jtk.v10i2.5604

Abstract

Pyrolysis is a process of chemical decomposition of materials through a heating method in the absence of oxygen or a little oxygen. The utilizing coal as a raw material for making liquid smoke, it is hoped that it will be able to produce pesticides that have economic value and can be used as a termite exterminator. The use of coal as a raw material for making liquid smoke is expected to produce pesticides that have economic value and can be used as a termite repellent. This research aimed to determine the optimum concentration and time of liquid coal smoke as a pesticide against termite insect mortality (Coptotermes curvignathus Holmgren). The method used is the coal pyrolysis process at a temperature of 300 0C. The process of testing the mortality of termites with time and concentration variables. The determination of the liquid smoke content of coal is carried out by qualitative and quantitative analysis. The results showed that the optimum time for termite mortality was 25 minutes with an optimum concentration of 80%, where the termite mortality was obtained by 100%. Based on the results of UV/VIS Spectrophotometer Analysis, the sulfur content of liquid coal smoke was 46.92 mg/kg, and the degree of acidity (pH) was 3.00. The acidity content is high enough to allow pesticides from liquid coal smoke to be widely used in agriculture.
Pemanfaatan Asap Cair Hasil Pirolisis Batubara sebagai Pestisida Organik pada Rayap (Coptotermes curvignathus Holmgren) Arman, Muh; Bakri, Suriyanto; Majid, Rafdi Abdul
Jurnal Teknik Kimia USU Vol. 10 No. 2 (2021): Jurnal Teknik Kimia USU
Publisher : Talenta Publisher (Universitas Sumatera Utara)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (301.764 KB) | DOI: 10.32734/jtk.v10i2.5604

Abstract

Pyrolysis is a process of chemical decomposition of materials through a heating method in the absence of oxygen or a little oxygen. The utilizing coal as a raw material for making liquid smoke, it is hoped that it will be able to produce pesticides that have economic value and can be used as a termite exterminator. The use of coal as a raw material for making liquid smoke is expected to produce pesticides that have economic value and can be used as a termite repellent. This research aimed to determine the optimum concentration and time of liquid coal smoke as a pesticide against termite insect mortality (Coptotermes curvignathus Holmgren). The method used is the coal pyrolysis process at a temperature of 300 0C. The process of testing the mortality of termites with time and concentration variables. The determination of the liquid smoke content of coal is carried out by qualitative and quantitative analysis. The results showed that the optimum time for termite mortality was 25 minutes with an optimum concentration of 80%, where the termite mortality was obtained by 100%. Based on the results of UV/VIS Spectrophotometer Analysis, the sulfur content of liquid coal smoke was 46.92 mg/kg, and the degree of acidity (pH) was 3.00. The acidity content is high enough to allow pesticides from liquid coal smoke to be widely used in agriculture.
Produksi Bahan Bakar Alternatif Briket Dari Hasil Pirolisis Batubara Dan Limbah Biomassa Tongkol Jagung Arman, Muh; Makhsud, Abdul; Aladin, Andi; Mustafiah; Majid, Rafdi Abdul
Journal of Chemical Process Engineering Vol. 2 No. 2 (2017): Journal of Chemical Process Engineering
Publisher : Fakultas Teknologi Industri - Universitas Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33536/jcpe.v2i2.891

Abstract

Banyaknya limbah biomassa tongkol jagung yang tidak termanfaatkan sehingga perlu dilakukan sebuah penelitian untuk pemanfaatan limbah tersebut menjadi bahan bakar alternatif briket. Biomassa tongkol jagung zero sulfur dapat digunakan untuk bahan campuran batubara higt sulfur untuk menurunkan kadar sulfur pada briket. Metodologi yang dilakukan melalui empat tahapan, yakni proses pirolisis bahan batubara dan biomassa. Setelah itu proses penggilingan dan pengayakan arang dengan ukuran partikel +50 -120 mesh. Selanjutnya dilakukan pencetakan briket dan yang terakhir tahap pengujian (Uji Proximate, Uji Ultimate, Kecepatan pembakaran). Hasil pengujian yang telah dilakukan diperoleh briket terbaik berdasarkan uji proximate dengan nilai kalor tertinggi pada briket tongkol jagung dengan nilai kalor 6771 kal/gr. Sedangkan perbandingan massa batubara-biomassa yang memenuhi Standar SNI briket yaitu perbandingan 25:75. Berdasarkan uji laju pembakaran briket diketahui jika biomassa mempercepat proses pembakaran.Kata Kunci
Optimasi Parameter Proses Leaching Bijih Nikel Laterit Menggunakan Asam Sitrat sebagai Pelarut Ramah Lingkungan Nuhardin, Irhamni; Majid, Rafdi Abdul
Dewantara Journal of Technology Vol. 5 No. 2 (2025): Dewantara Journal of Technology Volume 5 Nomor 2
Publisher : Akademi Teknologi Industri Dewantara Palopo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59563/djtech.v5i2.324

Abstract

Nikel merupakan logam strategis yang banyak digunakan dalam industri baja tahan karat, baterai, serta berbagai paduan logam berperforma tinggi. Sebagian besar cadangan nikel dunia berada dalam bentuk bijih laterit yang umumnya memiliki kadar nikel relatif rendah sehingga memerlukan teknologi ekstraksi yang efisien. Salah satu pendekatan yang banyak dikembangkan dalam pengolahan bijih laterit adalah proses hidrometalurgi melalui pelindian (leaching). Penelitian ini bertujuan untuk mengoptimasi parameter proses leaching bijih nikel laterit menggunakan asam sitrat sebagai pelarut ramah lingkungan. Parameter yang dievaluasi meliputi ukuran partikel bijih (100 mesh, 150 mesh, dan 200 mesh) serta konsentrasi asam sitrat (0,5 M; 1 M; dan 2 M) pada kondisi operasi tetap yaitu suhu 80°C, waktu leaching 60 menit, dan rasio padat-cair 1:5. Karakterisasi awal bijih dilakukan menggunakan X-Ray Fluorescence (XRF) untuk mengetahui komposisi unsur utama dalam sampel. Hasil analisis menunjukkan bahwa kadar nikel awal dalam bijih sebesar 1,67% dengan dominasi unsur Fe₂O₃ dan SiO₂ yang mengindikasikan karakteristik bijih laterit tipe limonit. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi asam sitrat dan pengecilan ukuran partikel memberikan pengaruh positif terhadap peningkatan persen recovery nikel. Nilai recovery tertinggi sebesar 78,29% diperoleh pada ukuran partikel 200 mesh dengan konsentrasi asam sitrat 2 M. Hasil ini menunjukkan bahwa luas permukaan partikel dan kekuatan larutan pelindian berperan penting dalam meningkatkan efisiensi proses ekstraksi nikel. Penggunaan asam sitrat sebagai pelarut organik juga memberikan keuntungan dari sisi keberlanjutan lingkungan dibandingkan penggunaan asam anorganik kuat. Penelitian ini memberikan kontribusi terhadap pengembangan teknologi pelindian bijih nikel laterit berbasis pelarut organik yang lebih ramah lingkungan.
Co-Authors Andi Aladin Arman, Muh Bakri, Suriyanto Makhsud, Abdul Muh Arman Mustafiah Nuhardin, Irhamni Rony, Zahara Tussoleha