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All Journal Jurnal Sains dan Teknologi Journal of Applied Materials and Technology
Sari, Esty Octiana
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Education Electrical & Electronics Engineering Engineering Mechanical Engineering

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PENGARUH SUHU DAN WAKTU REAKSI TERHADAP PEMBENTUKAN NANOPARTIKEL MAGNETIT (Fe3O4) SECARA HIDROTERMAL Sari, Esty Octiana; Fadli, Ahmad; Amri, Amun
Jurnal Sains dan Teknologi Vol 18, No 1 (2019): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (22.439 KB) | DOI: 10.31258/jst.v18.n1.p8-13

Abstract

Nanopartikel magnetit (Fe3O4) merupakan nanomaterial yang atraktif karena dapat diaplikasikan secara luas dalam bidang biomedis, elektronik, lingkungan, hingga pertanian. Metode hidrotermal merupakan salah satu metode sintesis sederhana untuk mendapatkan magnetit dengan ukuran terkontrol. Penelitian ini bertujuan menentukan pengaruh suhu dan waktu reaksi terhadap pembentukan nanomagnetit pada proses hidrotermal. Magnetit disintesis dari FeCl3, urea, sitrat dan polietilena glikol (PEG) pada suhu 180, 200 dan 220oC selama 1, 2, 3, 5, 7, 9 dan 12 jam. Hasil sintesis dikarakterisasi dengan XRD, TEM dan magnetometer. Hasil karakterisasi menunjukkan bahwa semakin tinggi suhu semakin cepat reaksi pembentukan magnetit. Semakin lama waktu reaksi, menunjukkan kecenderungan pada peningkatan kristalinitas dan ukuran partikel.
From waste to value: Lapachol from teak wood waste as a green catalyst for sustainable soda cooking of Acacia and Eucalyptus Sari, Esty Octiana; Utami, Syelvia Putri; -, Evelyn; Nakagawa-Izumi, Akiko; Ohi, Hiroshi
Journal of Applied Materials and Technology Vol. 7 No. 1 (2025): September 2025
Publisher : Faculty of Engineering Universitas Riau and Applied Materials and Technology Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/Jamt.7.1.22-30

Abstract

The development of a sustainable catalyst as an alternative to synthetic anthraquinone (AQ) is urgently needed for a more efficient pulping process. This study investigates the potency of lapachol, a natural naphthoquinone isolated from teak (Tectona grandis) wood waste, as a catalyst in soda cooking of three industrially important hardwoods: Acacia crassicarpa, Eucalyptus pellita, and Eucalyptus globulus. Approximately 97.7% purity of lapachol was isolated and applied at 0.09% (on oven-dry wood). For comparison, the commercial synthetic additive, 2-Methylanthraquinone (2-MAQ) was also used at the same dosage.  Cooking experiments were conducted at 160°C under varying alkali dosages (23, 27, 31%) and times (4, 5, 6 h). The result revealed that the delignification performance was species-dependent: A. crassicarpa (S/V=0.74) was the hardest, while E. globulus (S/V=3.04) was the easiest to delignify. Notably, E. pellita (S/V=2.04) shows the greatest selectivity index. Lapachol shows the capability of enhancing delignification across the three wood species by decreasing the residual lignin by up to 5% in A. crassicarpa, 5% in E. Pellita, and 2% in E. globulus compared with soda cooking (control). Although the delignification is slightly lower than 2-MAQ, lapachol maintains pulp yields comparable to or higher than 2-MAQ. The selectivity index analysis confirmed that lapachol improved the balance between lignin removal and carbohydrate preservation, with the benefits most pronounced in E. globulus. These findings underscore lapachol as a promising sustainable pulping catalyst, offering the potential for impactful industry transformation through sustainable innovation.
Co-Authors -, Evelyn Ahmad Fadli Amun Amri Nakagawa-Izumi, Akiko Ohi, Hiroshi Syelvia Putri Utami