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All Journal Jurnal Rekayasa Mesin Jurnal Komposit : Jurnal Ilmu-Ilmu Teknik Sipil Prosiding University Research Colloquium Molekul: Jurnal Ilmiah Kimia
Mujiburohman, Muhammad
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Humanities Biochemistry, Genetics & Molecular Biology Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Engineering Environmental Science Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Transportation

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N-Doped and Chemically Activated Carbons Derived from Shrimp Shells Waste as Potential Electrode Materials for Electrochemical Supercapacitors Khuzaimah, Siti; Mujiburohman, Muhammad; Sugiharto, Agung; Widayatno, Tri; Fuadi, Ahmad M.
Molekul Vol 20 No 2 (2025)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2025.20.2.11050

Abstract

ABSTRACT. Supercapacitors are widely recognized as energy storage solutions due to their high-power densities and long cycle life. Furthermore, there is growing scientific and technological interest in converting biomass waste into carbon materials for manufacturing supercapacitor electrodes. In addition to their abundance and cost-effectiveness, the appeal of carbons derived from biomass lies in their tuneable porosity, which enables the rational design of carbon materials to achieve the desired performance of supercapacitors. This work presents the synthesis of activated carbons from shrimp shells waste and its application for supercapacitor electrodes, with an activation treatment using phosphoric acid (H3PO4) and nitrogen doping (N-doped). The activator concentration was varied at 3, 6, and 9 M; while the N-doped ratios were 1:3, 1:5, and 1:7. The characteristics of activated carbon and supercapacitor electrodes was analysed with BET, SEM, CV, and GCD. The resulting materials exhibited amorphous and predominant microporous structures. Increasing the activation concentration gave smaller specific surface area, from 17.522 to 9.509 m2 g−1. The electrochemical properties of these activated carbons for supercapacitor applications were investigated by cyclic voltammetry, galvanostatic charge–discharge, with KOH electrolyte. The best activated carbon produced was mesoporous with the highest specific surface of 17.522 m2/g, obtained at 3 M H3PO4 and a nitrogen doping ratio of 1:3. At the same activator concentration and nitrogen doping ratio (3 M; 1:3), the highest capacitance was obtained 16.320 Farad, with current charging and discharging stop at 475 seconds and 1235 seconds, respectively. This work showcases the efficient and sustainable utilization of shrimp shells waste as a carbon source for supercapacitor applications and highlights their value in a circular economy. Keywords: Activated carbon, Activator H3PO4, Nitrogen doping, Shrimp shell, Supercapacitor
Pengaruh Kecepatan Pengadukan dan Jarak Elektroda Elektrokoagulasi Terhadap Penurunan Kadar TSS dan COD pada Limbah Cair Laundry Rahmayanti, Shofia; Mujiburohman, Muhammad
Prosiding University Research Colloquium Proceeding of The 11th University Research Colloquium 2020: Bidang MIPA dan Kesehatan
Publisher : Konsorsium Lembaga Penelitian dan Pengabdian kepada Masyarakat Perguruan Tinggi Muhammadiyah 'Aisyiyah (PTMA) Koordinator Wilayah Jawa Tengah - DIY

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Abstract

Industri laundry yang semakin berkembang terutama di pemukiman padat penduduk berpotensi menyebabkan kerusakan lingkungan akibat cukup besarnya limbah yang dihasilkan. Metode koagulasi konvensional lazim diterapkan dalam pengolahan limbah cair. Namun, penambahan bahan kimia sebagai koagulan justru menghasilkan limbah sekunder pada akhir prosesnya. Elektrokoagulasi, koagulasi dengan bantuan arus listrik, dinilai efektif mengatasi limbah cair laundry, tanpa menimbulkan limbah sekunder. Penelitian ini mengolah limbah cair laundry dengan elektrokoagulasi menggunakan elektroda alumunium. Pengaruh kecepatan pengadukan (150, 250, 350, 450 rpm) dan jarak elektroda (3 dan 7 cm) terhadap penurunan total suspended solid (TSS) dan chemical oxygen demand (COD) dipelajari. Pada kisaran variabel yang dipelajari, kondisi optimum diperoleh pada kecepatan pengadukan 350 rpm dan jarak elektroda 3 cm, dengan efisiensi penurunan kadar TSS sebesar 72,88% dan efisiensi penurunan kadar COD sebesar 86,08%.
Pengaruh Beda Potensial dan Waktu Kontak Elektrokoagulasi Terhadap Penurunan Kadar COD dan TSS pada Limbah Cair Laundry Kurniati, Tenny Rizki; Mujiburohman, Muhammad
Prosiding University Research Colloquium Proceeding of The 11th University Research Colloquium 2020: Bidang MIPA dan Kesehatan
Publisher : Konsorsium Lembaga Penelitian dan Pengabdian kepada Masyarakat Perguruan Tinggi Muhammadiyah 'Aisyiyah (PTMA) Koordinator Wilayah Jawa Tengah - DIY

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Abstract

Laundry adalah salah satu bisnis rumah tangga yang berkembang pesat, yang bergerak di bidang jasa pencucian. Namun, limbah cair yang dihasilkan memiliki dampak negatif terhadap lingkungan, karena mengandung kontaminan fosfat, surfaktan, TSS, TDS, kekeruhan, BOD5, dan COD yang tinggi. Salah satu metode yang cukup efektif menangani limbah cair laundry adalah elektrokoagulasi, yaitu koagulasi dengan difasilitasi elektroda tertentu yang dialiri listrik, yang menghasilkan bahan koagulan. Penelitian ini mengolah limbah cair laundry dengan elektrokoagulasi menggunakan elektroda alumunium, yang dioperasikan pada pH 7, suhu antara 28-30°C, kecepatan pengadukan 165 rpm, dan jarak elektroda 7 cm. Pengaruh perlakuan beda potensial (15 ; 22,5 ; 30 volt) dan waktu kontak (30; 45; 60 menit) terhadap perubahan kadar COD dan TSS dipelajari. Kondisi optimal diperoleh pada beda potensial 30 Volt selama 60 menit dengan efisiensi penurunan COD sebesar 88,69% dan 81,82% untuk TSS.
Pemanfaatan Limbah Serat Alam Kulit Buah Kelor Sebagai Papan Komposit yang Diperkuat Polimer Unsaturated Polyester Resin Jayadin, Jayadin; Nisa, Kartini Rahman; Siti Zuraidah; Leto, Kristina Tresia; Coa, Sri Astuti Rahman; Nurhadyati, Nurhadyati; Mujiburohman, Muhammad; Hikmatiar, Hamzarudin
Jurnal Komposit: Jurnal Ilmu-ilmu Teknik Sipil Vol. 9 No. 2 (2025)
Publisher : Universitas Ibn Khaldun

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32832/komposit.v9i2.17786

Abstract

The use of Composite Materials with natural fiber reinforcement is starting to be widely known in the manufacturing industry, environmentally friendly and recyclable materials. Composites are made to obtain lightweight structures, have higher strength or stiffness, energy absorption and design, have low prices and natural fibers are also easy to obtain, especially moringa fruit skin which is very abundant in the East Nusa Tenggara region, especially in Sikka Regency. This study aims to determine the Bending strength, impact energy and seawater absorption capacity. The research materials are moringa fruit skin fiber and polyester resin. Moringa fruit skin fiber is a waste that is rarely used so it can be a serious waste. This specimen is used with the Cold Compressing Molding method (Molds that are loaded at room temperature). The results of the study showed optimal conditions at a volume fraction of 25%, providing the highest Bending strength of 8,888 MPa, the highest impact energy of 0.196 J / mm2, and the lowest seawater absorption value of 0.79%.
Utilization of Moringa Fruit Peel Waste and Sawdust as Hybrid Composite Boards with Polyester Resin Matrix Leto, Kristina Tresia; Jayadin; Ridwan, Mastura; Coa, Sri Astuti Rahman; Nisa, Kartini Rahman; Mujiburohman, Muhammad; Ismiralda, Ismiralda; Farizi, Zakaria Al
Jurnal Rekayasa Mesin Vol. 20 No. 3 (2025): Volume 20, Nomor 3, Desember 2025
Publisher : Mechanical Engineering Department - Semarang State Polytechnic

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/jrm.v20i3.6941

Abstract

Environmental damage, previously considered a local problem, has now developed into a global issue, with waste becoming an increasingly pressing issue, especially in developing countries. Inadequate waste management has the potential to cause serious impacts on environmental sustainability and human health. One type of waste that has not been optimally utilized is moringa fruit peel waste and wood sawdust. This waste often causes soil and air pollution because it is left to pile up and burned. Therefore, this study aims to develop a Hybrid composite that combines moringa fruit peel waste and wood sawdust as a reinforcing material, as well as to test the mechanical and physical properties of the resulting composite board. This study uses an experimental approach in the laboratory with variations in waste composition (15%: 5%: 80%), (20%: 10%: 70%), (25%: 15%: 60%) and a composite board thickness of 1 cm. Testing parameters include tensile tests, compression tests, and water absorption. The tensile test results show that the composition of 15% moringa fruit peel fiber and 5% wood sawdust produces the highest tensile strength of 13.622 Mpa. Compression tests showed that a composition of 20% moringa rind fiber and 10% sawdust produced the highest compressive strength of 25.527 MPa. Water absorption tests showed that a composition of 25% moringa rind fiber and 15% sawdust had the lowest, or optimal, water absorption of 1.8%.
Co-Authors Agung Sugiharto Coa, Sri Astuti Rahman Farizi, Zakaria Al Fuadi, Ahmad M. Hartoko, Indra Viki Herry Purnama, Herry hikmatiar, hamzarudin Ismiralda, Ismiralda Jayadin Kristina Tresia Leto Kurniati, Tenny Rizki Nisa, Kartini Rahman Nur Hidayati Nurhadyati, Nurhadyati Rahmayanti, Shofia Ridwan, Mastura Siti Khuzaimah Siti Zuraidah Tri Widayatno