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All Journal JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Greensusmater
Quratul Aini
Department of Materials Engineering, Institut Teknologi Sumatera, Terusan Ryacudu, Way Hui, Jati Agung, Lampung Selatan 35365, Indonesia
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 Coconut and Sugarcane Fiber Volume Fraction Variations on the Tensile Properties of Epoxy Matrix Composites Fitri, Anisa; Bayu Prasetya; Muhammad Yasin Siregar; Quratul Aini; Wahyu Solafide Sipahutar; Fathar Fathan Mubina
Jurnal Permadi : Perancangan, Manufaktur, Material dan Energi Vol 7 No 01 (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.v7i01.192

Abstract

Materials are continually being developed for sustainable applications. Agricultural wastes such as sugarcane bagasse and coconut fiber show great potential as reinforcing agents in polymer composites. This study investigates the effect of varying volume fractions of sugarcane and coconut fibers on the tensile properties of epoxy matrix composites. Four fiber composition ratios were prepared, maintaining a total fiber volume fraction of 50% and matrix fraction of 50%, specifically: 25:25, 20:30, 10:40, and 0:50 (coconut fiber: sugarcane fiber, respectively). All fibers underwent alkali treatment using a 5% NaOH solution to improve interfacial bonding with the epoxy matrix. Composite fabrication was performed via hand lay-up, and tensile tests followed ASTM D3039 standards using a Universal Testing Machine (UTM). The results indicated that the composite with 20% coconut fiber and 30% sugarcane fiber (sample B) exhibited the highest tensile strength of 30.48 MPa and the highest elastic modulus of 2.29 GPa, albeit with a low strain at failure (0.01), suggesting brittle behavior. In contrast, the balanced composition (25:25) demonstrated more stable mechanical performance, achieving a tensile strength of 28.31 MPa and a higher strain of 0.04, indicating improved toughness. The lowest tensile strength, 15.56 MPa, was observed in the 10:40 composition (sample C). Failure analysis revealed modes such as matrix cracking, fiber-matrix debonding, and fiber pull-out, which varied according to fiber composition. In conclusion, this study demonstrates that a balanced volume fraction of coconut and sugarcane fibers yields epoxy composites with optimal tensile strength and a favorable balance between strength and toughness.
Co-Authors Aflaha, Rizky Anisa Fitri Bayu Prasetya Eka Nurfani Fathar Fathan Mubina Khan, Mochammad Ghulam Isaq Muhammad Yasin Siregar Phasa, Agita Sabilla, Sal Sipahutar, Wahyu Solafide Triyadi, Dedi