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All Journal JURNAL PERMADI: PERANCANGAN, MANUFAKTUR, MATERIAL DAN ENERGI Greensusmater
Hanifah, Istiara Rizqillah
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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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Congo red dye adsorption using ZnAl layered double hydroxide fabricated using hydrothermal methods Fitri, Anisa; Lumbanraja, Febriwan Rizki; Hanifah, Istiara Rizqillah; Prasetya, Bayu; Aflaha, Rizky; Putra, Septia Eka Marsha
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.2024.1.2.44-50

Abstract

Industrial dye pollutants, particularly azo dyes like Congo red, pose significant environmental and health risks due to their toxic and non-biodegradable nature. This study assesses ZnAl Layered Double Hydroxide (ZnAl LDH) as an effective adsorbent, incorporating comprehensive materials characterization and adsorption isotherm analyses. Materials characterization using SEM and XRD confirmed the structural integrity and morphological suitability of ZnAl LDH for dye adsorption. Results demonstrated that ZnAl LDH, particularly the HMTA-based variant (h-ZnAl LDH), achieved superior adsorption capacities of up to 17.8 mg/g, significantly outperforming the urea-based (u-ZnAl LDH) with capacity of 12.3 mg/g. Kinetic analysis showed that the pseudo-second-order (PSO) model provided a better fit (R2 = 0.995) than the pseudo-first-order (PFO) model, indicating that chemisorption plays a dominant role in the adsorption mechanism. The adsorption process was also best described by the Langmuir isotherm model (R2 = 0.989), indicating monolayer adsorption on a homogeneous surface, while the Freundlich model (R2 = 0.944) also provided a reasonable fit, suggesting some degree of multilayer adsorption on heterogeneous surfaces. The superior performance of HMTA-based ZnAl LDH presents a significant advancement in 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 Anisa Fitri Lumbanraja, Febriwan Rizki Oji Kuncoro Darma Putra Phasa, Agita Prasetya, Bayu Putra, Oji Kuncoro Darma Septia Eka Marsha Putra Sipahutar, Wahyu Solafide