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All Journal SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin
Suteja Suteja
Department of Mechanical Engineering, Universitas Mataram, Mataram 83125, Indonesia
Automotive Engineering Control & Systems Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering

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Ceiba Pentandra Seed Extract as Green Corrosion Inhibitor for Mild Steel in Citric Acid Media: Electrochemical Investigation Syarif Hidayatullah; Suteja Suteja
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 20 No. 1 (2026): SINTEK JURNAL (In Progress)
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.20.1.31-43

Abstract

In citric acid medium, Ceiba pentandra seed extract an agricultural by product contains abundant heterocyclic and nitrogen-containing compounds that function as efficient and environmentally benign corrosion inhibitors. Compared with conventional synthetic inhibitors, plant-based extracts offer notable advantages, including low toxicity, biodegradability, renewability, and cost-effectiveness. The extract was prepared using the reflux method and tested at concentrations ranging from 1000 to 3000 ppm. The active functional groups were identified by Fourier Transform Infrared Spectroscopy (FTIR), while corrosion inhibition performance was evaluated using Potentiodynamic Polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS). At 3000 ppm, the extract exhibited inhibition efficiencies of 81.42% (PDP) and 74.21% (EIS), attributed to the adsorption of aromatic, heterocyclic, and carbonyl groups onto the metal surface. These findings confirm the potential of Ceiba pentandra seed extract as a sustainable, low-cost, and high-performance green corrosion inhibitor, underscoring its promise as an environmentally safe alternative to conventional hazardous inhibitors.
Characteristics of Holocellulose Isolated from Waru Bark Fibers as Biopackaging Materials Suteja Suteja; Syarif Hidayatullah; Nasmi Herlina Sari; Maharsa Pradityatama
SINTEK JURNAL: Jurnal Ilmiah Teknik Mesin Vol. 19 No. 2 (2025): SINTEK JURNAL
Publisher : Faculty of Engineering, Universitas Muhammadiyah Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24853/sintek.19.2.132-143

Abstract

Holocellulose isolated from waru bark fiber (HCT) holds significant potential as a sustainable material for packaging applications in the food, pharmaceutical, and agricultural industries. Understanding its characteristics is crucial for optimizing chemical and mechanical treatments to enhance performance. This study isolated holocellulose from waru bark fibers via sequential hydrothermal alkaline (5% NaOH) and acid-bleaching (NaClO₂-CH₃COOH) treatments at 60°C. The raw fibers (RW-HCT) and treated holocellulose (TR-HCT) were characterized using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA). FTIR analysis confirmed the effective removal of lignin and hemicellulose components in TR-HCT, evidenced by the disappearance of peaks at 1735.29 cm⁻¹ (C=O stretching) and 1327.68 cm⁻¹ (C–O in lignin). XRD results showed that the crystallinity index increased from 62.29% ± 3.47 (RW-HCT) to 77.41% ± 5.26 (TR-HCT). SEM micrographs revealed a rougher, cleaner fiber surface in TR-HCT due to the removal of non-cellulosic impurities. TGA demonstrated improved thermal stability of TR-HCT, with a higher residual mass (1.01%) compared to RW-HCT (−6.43%). The findings indicate that holocellulose from waru bark fibers is a promising, eco-friendly reinforcement material for developing biodegradable packaging composites.
Co-Authors Maharsa Pradityatama Nasmi Herlina Sari Syarif Hidayatullah