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All Journal JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Greensusmater
Phasa, Agita
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Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Photocatalytic degradations of organic pollutants in wastewater using hydrothermally grown ZnO nanoparticles Phasa, Agita; Aini, Quratul; Siregar, Muhammad Yasin; Sabilla, Sal; Triyadi, Dedi; Aflaha, Rizky; Khan, Mochammad Ghulam Isaq; Nurfani, Eka
Greensusmater Vol. 1 No. 2 (2024)
Publisher : Green and Sustainable Materials Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.62755/greensusmater.2024.1.2.39-43

Abstract

The increasing prevalence of organic pollutants in wastewater poses a significant environmental challenge due to their persistence and harmful effects. Photocatalysis using semiconductor nanoparticles, such as ZnO, has emerged as a promising approach for pollutant degradation, but optimizing the structural and functional properties of these materials remains a critical challenge. In this study, ZnO nanoparticles were synthesized via a hydrothermal method with varying durations (4, 6, and 8 hours) to investigate the impact of synthesis time on their photocatalytic efficiency. The structural and compositional properties were characterized using SEM, XRD, and EDS analyses, revealing that longer synthesis times improve crystallinity and alter the Zn:O atomic ratio, affecting defect density and stoichiometry. Photocatalytic performance was evaluated through the degradation of an organic pollutant under UV illumination. ZnO-6h exhibited the highest rate constant (k=0.017 min−1), outperforming ZnO-4h (k=0.016 min−1) and ZnO-8h (k=0.013 min−1). This superior activity is attributed to an optimal combination of high crystallinity, intermediate morphology, and the presence of oxygen vacancies that enhance charge carrier dynamics. The findings demonstrate that synthesis duration is a critical parameter in tuning the structural and photocatalytic properties of ZnO nanoparticles. This study provides insights into the design of ZnO-based photocatalysts and underscores their potential for environmental remediation. Future research could extend these findings by exploring scalability and pollutant-specific applications, paving the way for more efficient wastewater treatment technologies.
Effect of Fiberglass Layer Number on the Mechanical Properties of Composites Fabricated Using the Vacuum-Assisted Resin Infusion (VARI) Method Hanifah, Istiara Rizqillah; Putra, Oji Kuncoro Darma; Sipahutar, Wahyu Solafide; Phasa, Agita
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.195

Abstract

Composite materials are engineered by combining two or more constituents to obtain improved mechanical performance. In this study, the effect of fiberglass layer number (2 and 3 layers) on the mechanical properties of composites was investigated. The specimens were fabricated using the Vacuum-Assisted Resin Infusion (VARI) method, and mechanical tests were conducted based on ASTM D3039 (tensile) and ASTM D790 (flexural) standards. The 3-layer specimen (A2) exhibited the highest tensile strength of 223.33 MPa and flexural strength of 845.54 MPa, compared to 179.73 MPa and 828.35 MPa in the 2-layer specimen (A1), respectively. In addition, the 3-layer composite showed greater stiffness with an elastic modulus of 612.76 GPa in bending and 1.41 GPa in tension. These results confirm that increasing the number of fiberglass layers enhances the composite's mechanical strength, due to better load distribution and improved interfacial bonding.
Effect of Fiber Orientation on the Mechanical Performance of Polyester/Fiberglass Composites Fabricated by VARI Agita Phasa; Oji Kuncoro Darma Putra; Wahyu Solafide Sipahutar; Istiara Rizqillah Hanifah
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 02 (2025): JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI
Publisher : Universitas Nusa Putra

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.52005/permadi.v7i02.196

Abstract

The fiber orientation in polyester/fiberglass composites fabricated using the Vacuum Assisted Resin Infusion (VARI) method was investigated. Three different fiber orientation configurations consisting of three woven layers were used: 0°/45°/0°, 45°/45°/45°, and 45°/0°/45°. Tensile and flexural tests were conducted to evaluate the strength, strain, and flexural modulus of each specimen. The results demonstrated that fiber orientation has a significant impact on mechanical performance. The 0°/45°/0° specimen exhibited the highest tensile strength of 164.66 MPa and flexural strength of 1091.17 MPa. In contrast, the 45°/45°/45° specimen showed the lowest tensile strength of 58.57 MPa, while the 45°/0°/45° specimen had the lowest flexural strength of 772.97 MPa. The 45°/45°/45° configuration displayed intermediate mechanical values with a more homogeneous stress distribution. Interestingly, the highest flexural modulus, 5702.23 MPa, was obtained from the 45°/0°/45° specimen, indicating high stiffness despite limited deformation. These findings confirm that proper selection of fiber orientation plays a crucial role in designing composites with an optimal balance of strength, stiffness, and ductility.
Co-Authors Aflaha, Rizky Eka Nurfani Hanifah, Istiara Rizqillah Khan, Mochammad Ghulam Isaq Muhammad Yasin Siregar Oji Kuncoro Darma Putra Putra, Oji Kuncoro Darma Quratul Aini Sabilla, Sal Sipahutar, Wahyu Solafide Triyadi, Dedi