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All Journal Komunikasi Fisika Indonesia Phi : Jurnal Pendidikan Fisika dan Terapan Jurnal Fisika Unand Jurnal Sains & Teknologi Lingkungan Jurnal Fisika FLUX Jurnal Rekayasa Material, Manufaktur & Energi JOURNAL OF SCIENCE AND SOCIAL RESEARCH Saintifik : Jurnal Matematika, Sains, dan Pembelajarannya Jurnal Pengabdian kepada Masyarakat Nusantara Navigation Physics : Journal of Physics Education CHEDS: Journal of Chemistry, Education, and Science Phydagogic : Jurnal Fisika dan Pembelajarannya Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan EINSTEIN (E-JOURNAL)
Lubis, Ridwan Yusuf
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Aerospace Engineering Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences Other

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PENGARUH VARIASI MASSA PADA GREEN SYNTHESIZED MATERIAL ADSORPSI Fe3O4/TiO2 DENGAN METODE KOPRESIPITASI TERHADAP NILAI BANDGAP MENGGUNAKAN UV-VIS Arnydhinata, Ella; Lubis, Ridwan Yusuf; Husnah, Miftahul
CHEDS: Journal of Chemistry, Education, and Science Vol 9, No 2 (2025)
Publisher : Universitas Islam Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30743/cheds.v9i2.11961

Abstract

Material fotokatalitik adalah material yang digunakan untuk mempercepat degradasi polutan dalam air dengan menyerap foton yang dapat mempercepat reaksi kimia. Proses fotokatalitik dapat dipercepat jika nilai bandgap material lebih kecil dengan mencampurkan Fe₃O₄ dan TiO₂. Proses pencampuran menggunakan metode kopresipitasi. Rasio massa yang digunakan untuk Fe₃O₄/TiO₂ (FT) adalah 2:1 (FT1), 1:1 (FT2), dan 1:2 (FT3). Sampel FT kemudian diuji menggunakan XRD dan UV-Vis untuk menilai hasil degradasi dan pengurangan bandgap. Hasil analisis XRD menunjukkan penurunan ukuran kristal dari 30,71 menjadi 28,59 nm. Pengujian UV-Vis menunjukkan penurunan nilai bandgap sebesar 2,38 eV dan persentase degradasi sebesar 99,55%. Peningkatan rasio massa TiO₂ terhadap Fe₃O₄ memengaruhi ukuran dan nilai bandgap material fotokatalitik. Hasil degradasi metilen biru yang paling optimal diperoleh pada sampel FT3 dengan rasio campuran 1:2.
Karbon Aktif Kulit Bawang Merah (Allium ascalonicum) untuk Mereduksi Bilangan Asam dan Peroksida: Indonesia Lubis, Ridwan Yusuf; Insani, Rizki; Husnah, Miftahul; Silalahi, Ali Affan
Jurnal Sains & Teknologi Lingkungan Vol. 18 No. 1 (2026): SAINS & TEKNOLOGI LINGKUNGAN
Publisher : Teknik Lingkungan Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/jstl.vol18.iss1.art3

Abstract

Activated carbon is one of the adsorption materials commonly used to improve the quality of used cooking oil. This study aims to determine the effect of varying concentrations of phosphoric acid (H₃PO₄) as a chemical activator on activated carbon derived from red onion peel. The research data were expressed quantitatively through physical and chemical characterization, while the results of color and odor tests were presented descriptively. Activated carbon from red onion peel was successfully produced through physical activation (400 °C) and chemical activation (H₃PO₄) with concentration variations A (8%), B (12%), C (16%), and D (20%). The characterization results showed a decrease in moisture content, ash content, and volatile matter content, while the carbon content increased. Sample D met the requirements of SNI 06-3730-1995 for all physical and chemical characteristics. An increase in adsorption ability for acid value was observed in line with the increase in activator concentration. The ability to reduce peroxide value decreased in samples C and D compared to sample B, but still met the SNI 3741:2013 standard. The most optimal characterization and adsorption performance were obtained in sample D, with an acid value of 0.33% (mg KOH/kg) and a peroxide value of 8 (meq O₂/kg).
Pemanfaatan Pati Kentang dan Selulosa Batang Jerami Padi sebagai Bahan Baku Pembuatan Bioplastik yang Ramah Lingkungan Nasution, Mutia Fadilah; Daulay, Abdul Halim; Lubis, Ridwan Yusuf
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 6 No. 1 (2026): January
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v6i1.1020

Abstract

This study aims to overcome the weaknesses of starch-based bioplastics by utilizing cellulose extracted from rice straw stalks. The increasing amount of conventional plastic waste that is difficult to decompose has created an urgent environmental problem, so that bioplastics have emerged as an environmentally friendly alternative. However, bioplastics from potato starch have low water resistance and less than optimal mechanical properties. Rice straw stalks were chosen because of their abundant availability and high cellulose content (32-47%). The process of making bioplastics was carried out with variations in the composition of potato starch and rice straw stalk cellulose (100%: 0%; 87.5%: 12.5%; 75%: 25%; and 62.5%: 37.5%), with the addition of chitosan (2 g) and glycerol (2 ml) as additives. The characterizations conducted included water absorption test (ASTM D570-98), biodegradation test, tensile strength test (ASTM E8M), percent elongation (ASTM D882-12), and identification of functional groups using FTIR (Fourier Transform Infrared). The results showed that the addition of rice straw cellulose had a positive effect on the characteristics of bioplastics. The best water absorption test was obtained in sample C (75% Starch: 25% Cellulose) with a value of 13% which meets the ASTM D570-98 standard. The best biodegradation test was obtained in sample B (87.5% Starch: 12.5% ​​Cellulose) with a value of 62%. The maximum tensile strength value was recorded at 1.23 MPa in sample C, and the maximum percent elongation value was 99.2% in sample D. FTIR analysis confirmed the presence of main functional groups (O-H, C-H, N-H, C-O) which indicated an effective interaction between potato starch, rice straw cellulose, and chitosan. Overall, this composite bioplastic shows optimal potential and characteristics as an environmentally friendly material.
Pengaruh Penambahan Asam Oleat terhadap Karakteristik Nanopartikel Magnetit dengan Metode Kopresipitasi Damayanti, Della; Lubis, Ridwan Yusuf; Daulay, Abdul Halim
Panthera : Jurnal Ilmiah Pendidikan Sains dan Terapan Vol. 6 No. 1 (2026): January
Publisher : Lembaga Pendidikan, Penelitian, dan Pengabdian Kamandanu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/panthera.v6i1.1043

Abstract

This study discusses the use of natural iron sand in the manufacture of magnetite nanoparticles with oleic acid. The purpose of the study is to produce nano-sized magnetite as an alternative photocatalyst material. Magnetite nanoparticles were synthesized with variations of oleic acid (0.75 ml, 1.5 ml, 2.25 ml, 3 ml) and the addition of 7.5 ml of diethylamine. Synthesis was carried out using XRF to determine the elements contained in the iron sand, SEM to determine the surface morphology, and UV-Vis to determine the size of the bandgap. The results showed that increasing the oleic acid content significantly increased agglomeration due to the large number of particles that merged with each other, while increasing the bandgap value. The results showed that the addition of oleic acid had an effect on the iron sand. The highest XRF test of 88.234% was obtained in the iron sand sample before processing, the lowest SEM test was 0.9 μm, and the highest UV-Vis test was 2.644 eV indicating an increase in the bandgap energy value due to the role of oleic acid as a surfactant. The novelty of this research lies in the use of natural iron sand combined with a fixed proportion of oleic acid (up to 3 ml) and diethylamine (7.5 ml). A good bandgap for the photocatalyst is 2.638 eV which is influenced by the addition of oleic acid as a surfactant. These magnetite nanoparticles show optimal potential and characteristics as photocatalyst materials.
Co-Authors ., Masthura Abdul Halim Daulay Amalia, Fadiah Nur Arnydhinata, Ella Basri Btr, Mhd Hasan Br Situmorang, Dinda Agelia Cahyani, Rahmatika Fitri Della Damayanti, Della Fazira, Natasya Aulia Hakim, Ibnu Harahap, Balkis Br Insani, Rizki Jumiati, Ety Khairunnisa, Umi Khairunnisa Lenni, Nurma Lubis, Hilwa Salsabila Mahyuda, Maulana Masthura Miftahul Husnah Nasution, Fajar Siddik Nasution, Mutia Fadilah Nasution, Nazaruddin Natasya, Kinanty Desiva Noviansyah, Kiki Nurlisa, Siti Putri, Eka Julia Rambe, Khoirunnisa Fadila Ratni Sirait, Ratni Safina, Nurul Sariah, Jati Nur Silalahi, Ali Affan Sirait, Ratni Sirait Siti Khairani Sinaga, Siti Khairani Sitompul, Yusril Padli Syahrani, Vania Retna Tiara, Finky Manda