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All Journal Jurnal RISA Journal of Applied Materials and Technology
-, Evelyn
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Engineering Mechanical Engineering

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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.
PENGARUH PEMBAYANGAN ANTAR MASSA DAN TIPE FASAD TERHADAP EFEKTIVITAS PENERAPAN PANEL FOTOVOLTAIK PADA FASAD RUSUNAWA NAGRAK JAKARTA -, Evelyn; Ritva Santoso, Amirani
Jurnal Riset Arsitektur Vol 7 No 04 (2023): RISET ARSITEKTUR "RISA"
Publisher : Program Studi Arsitektur, Fakultas Teknik, Universitas Katolik Parahyangan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26593/risa.v7i04.7236.407-423

Abstract

Abstract – The sun is one of the most important and largest sources of energy for the earth. The energy emittedby the sun can be utilized both actively and passively. Solar cells or photovoltaics are used to convert solarradiation into electrical energy, which is known as active utilization.Rusunawa (Rumah Susun Sederhana Sewa)is a facility to provide affordable housing for people with low income. The target demographic create a needsfor clean and affordable energy, which can be overcomed by implementing solar panels.The current type of Rusunawa being built is high-rise buildings with over 15 levels. This new type ofbuilding decreases the roof space while increasing the facade area. As a result, photovoltaics panels must beinstalled on the building's façade. The goal of this research is to determine the effectivity of implementing solarpanels on the facade of Rusunawa Nagrak, in correlation to the tenant’s energy cost savings, as well as todetermine standard coefficients/ values so that the findings can be applied in the future to building with similartypologies with slight adjistments.This is an experimental-quantitative type research done with the help of Rhinoceros, Grasshopper, andLadybug software to find the most optimal photovoltaic panel configuration for the use of Rusunawa NagrakTower 1-5.Keyword: Government Subsidized High-Rise Housing, Photovoltaic Panel, Masses Configuration Shading,Building Façade, Cilincing Jakarta.
Co-Authors Nakagawa-Izumi, Akiko Ohi, Hiroshi Ritva Santoso, Amirani Sari, Esty Octiana Syelvia Putri Utami