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Jurnal Fisika Unand
Published by Universitas Andalas
ISSN : 23028491     EISSN : 26862433     DOI : https://doi.org/10.25077/jfu
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Makalah yang dapat dipublikasikan dalam jurnal ini adalah makalah dalam bidang Fisika meliputi Fisika Atmosfir, Fisika Bumi, Fisika Intrumentasi, Fisika Material, Fisika Nuklir, Fisika Radiasi, Fisika Komputasi, Fisika Teori, Biofisika, ataupun bidang lain yang masih ada kaitannya dengan ilmu fisika.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 15 Documents
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Search results for , issue "Vol 14 No 3 (2025)" : 15 Documents clear
Biokoagulan dari Daun Mangrove sebagai Koagulan Limbah Cair Industri Tahu Aldriansah, Aldo; Acmad Abiyyu Yusuf Sinatrya Junardokham; Astuti, Dwi Hery; Wahyusi, Kidriari Nurma
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.291-297.2025

Abstract

The utilization of bio-coagulants derived from mangrove leaf tannins offers an eco-friendly alternative for treating tofu industry wastewater. This study aims to evaluate the effect of mangrove leaf weight and sonication time on extracted tannin content and its effectiveness in reducing pollution parameters. Extraction was conducted using a sonication–maceration method with 96% ethanol, varying leaf weights (10–50 grams) and sonication durations (20–100 minutes). Tannin content was analyzed by KMnO₄ titration, and the extract with the highest yield was applied to the coagulation process. The highest tannin yield (10.78%) was obtained using 50 grams of leaf and 100 minutes of sonication. Application of the bio-coagulant reduced BOD by 24.7%, COD by 29.1%, increased TSS by 49.3%, and raised the pH from 3.59 to 3.71. Although less efficient than alum, tannin shows potential as a natural coagulant. Further optimization involving coagulant combinations and pH adjustment is recommended to enhance performance.
Green Synthesis Nanopartikel Seng Oksida (Zno) dengan Menggunakan Ekstrak Daun Kakao Sebagai Capping Agent: Green Synthesis Nanopartikel Seng Oksida (Zno) dengan Menggunakan Ekstrak Daun Kakao Sebagai Capping Agent Repiani, Repiani; Handani, Sri; Puryanti, Dwi
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.212-217.2025

Abstract

A study was conducted to investigate the effect of varying concentrations of cocoa leaf extract on ZnO nanoparticles as a capping agent. The concentrations of cocoa leaf extract were varied at 0%, 2%, 4%, 6%, and 8%, and tested to observe their effects on crystal size, optical properties, and morphology of the ZnO nanoparticles. The ZnO nanoparticles were synthesized using the sol-gel method with cocoa leaf extract. The success of the synthesis was indicated by the similarity of the peaks from the synthesized compounds to the standard ZnO peaks in the X-Ray Diffraction (XRD) analysis. The resulting crystal structure was hexagonal wurtzite, with crystal sizes for each extract concentration of 54.393 nm, 54.01 nm, 54.39 nm, 45.61 nm, and 38.45 nm, respectively. UV-Vis spectrometer analysis showed that the ZnO nanoparticles were relatively stable at wavelengths between 228 nm and 366 nm, with bandgap energy values for each extract concentration being 3.11 eV, 3.13 eV, 3.11 eV, 3.14 eV, and 3.15 eV, respectively. The UV-Vis results indicated that the bandgap energy increased with increasing concentrations of cocoa leaf extract, while the crystal size decreased, which was consistent with the XRD results. Scanning electron microscope (SEM) analysis showed that ZnO nanoparticles synthesized with 4% cocoa leaf extract predominantly exhibited a spherical shape, with an average size of 45 nm.
PENENTUAN KUALITAS AIR SUNGAI BATANG AGAM KOTA PAYAKUMBUH BERDASARKAN PARAMETER FISIKA DAN KIMIA Sri Agustianingsih, Maharani; Puryanti, Dwi; Purwanto, Eko
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.312-318.2025

Abstract

Research to identify the level of water quality of Batang Agam River in Payakumbuh City has been conducted based on physical and chemical parameters. Physical parameters in this study are temperature, electrical conductivity, Total Dissolve Solid (TDS), and Total Suspended Solid (TSS). Chemical parameters in this study are acidity (pH) and heavy metals in the form of cadmium (Cd), lead (Pb), and zinc (Zn). The level of river water pollution is processed using the Pollution Index (IP) method and analyzed based on the class I quality standard of Government Regulation No. 22 of 2021. The results of this study obtained that the temperature value of the Batang Agam River in Payakumbuh City in the Sumatra Region Balai Park (TBWS) area exceeds the quality standard value of 30.33⁰C. The pH and TDS values are still within the quality standard threshold of 6-9 and 1000 ppm respectively. The TSS value has exceeded the quality standard value of 40 ppm. The electrical conductivity value is still within the quality standard according to the World Health Organization (WHO) 2017 of 1500 µs/cm. The concentrations of heavy metals Cd, Pb, and Zn were 0.0495 mg/L, 0.0325 mg/L, and 0.0254 mg/L, respectively, with Cd and Pb concentrations exceeding the quality standard. Based on the measurement of water quality parameters, it is concluded that the level of pollution of the Batang Agam River in Payakumbuh City is classified as lightly polluted with an average IP value of 4.61, which cannot be used for drinking water and household purposes.
Pengaruh Penambahan Phenethylammonium Iodida (PEAI) terhadap Struktur dan Sifat Optik Lapisan Perovskite Solar Cell FAPbI3 Manda, Poni Dwi; Dahlan, Dahyunir; Harmadi, Harmadi; Umar, Akrajas Ali
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.298-304.2025

Abstract

This study explores the effect of doping phenethylanimum iodide (PEAI) on grain size and absorption ability in the perovskite formanidinium lead iodide (FAPbI3) layer. FAPbI3 was chosen as the object of study because of its potential application in perovskite-based solar cell technology. In this experiment, the FAPbI3 perovskite layer was prepared with a PEAI doping variation using a two-stage spin-coating method. Ultraviolet-visible (UV-Vis) spectrum analysis showed that the perovskite layer has typical optical absorption characteristics at a wavelength of 780 nm, with a measured energy gap value of 1.48 eV at a PEAI concentration of 2 mg/ml. In addition, the surface morphology of FAPbI3 showed an increase in grain size along with the addition of PEAI doping, where the optimal grain size was recorded at a doping of 2 mg/ml with a size of 0.54 ± 0.03 μm and a smooth and homogeneous morphology. These findings are expected to make a significant contribution to the development of more efficient and stable solar cells
Graphene-Based Electrode Materials via Liquid Phase Exfoliation from Chicken Feather Waste Negara, Vamellia Sari Indah; Usna, Sri Rahayu Alfitri; Machmudah, Machmudah; Astuti, Astuti
Jurnal Fisika Unand Vol 14 No 3 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.3.305-311.2025

Abstract

Graphene was successfully synthesized from chicken feather biomass waste using the Liquid Phase Exfoliation (LPE) method assisted by Linear Alkylbenzene Sulfonate (LAS) surfactant at varying volumes of 1 mL, 1.5 mL, and 2 mL. The aim of this study was to evaluate the potential of chicken feather-derived graphene as an electrode material for rechargeable batteries. Characterization using UV-Visible spectrophotometry showed a distinct absorption peak at approximately 270 nm, corresponding to the π→π* electronic transition, with increasing absorbance intensity observed with higher surfactant volumes, indicating more effective graphene exfoliation. XRD analysis revealed a shift in diffraction peaks to lower 2 angles, increased interlayer spacing (d-spacing), and the largest crystallite size of 13.58 nm at a surfactant volume of 1.5 mL. These results indicate that the surfactant plays a critical role in stabilizing and forming the crystalline structure of graphene. Overall, this study demonstrates that chicken feather-based graphene has promising potential to be developed as an eco-friendly electrode material in rechargeable battery applications

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