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All Journal Journal of Mathematical and Fundamental Sciences Jurnal Teknik Lingkungan Bulletin of Chemical Reaction Engineering & Catalysis
Puji Lestari
Program Studi Teknik Lingkungan Fakultas Teknik Sipil Dan Lingkungan, Institut Teknologi Bandung
Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Engineering Environmental Science Mathematics Physics

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Evaluation NO2 Detection Using Low-Cost Folded-Path Photometer Januar Arif Fatkhurrahman; Puji Lestari
Journal of Mathematical and Fundamental Sciences Vol. 54 No. 3 (2023)
Publisher : Directorate for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2023.54.3.5

Abstract

The measurement of nitrogen dioxide (NO2) in industrial and residential areas needs comprehensive and reliable instrumentation providing long-interference-free operation and minimum maintenance and recalibration. Differential optical absorption spectroscopy can be used as a direct measurement technique based on the specific absorption characteristics of NO2 following the Berr-Lambert law. This paper proposes a low-cost folded-path photometer to measure NO2 in the air. Cheap tubular acrylic was used as a detection cell with a 3D printed framework, making it compact, modular, and flexible. Evaluation of this differential optical absorption spectroscope (DOAS) was conducted by instrument test responses using NO2 gas. The estimated LOD was ~1263 ppb using a 2-nm resolution of the spectrometer and a 6-meter detection cell length. Deviation of the DOAS was estimated to be 0.8% at high concentration and 2.85% at low concentration based on the calibrated DOAS. Intercomparison of the results was conducted using two different instruments to evaluate the DOAS’s performance by measuring NO2 from motorcycle emissions, which indicated that there was a good correlation between the results. The coefficient correlation (R) was 0.649 for the DOAS- ASTM D1607 Griesz Saltzmann method pairing and 0.846 for the DOAS- electrochemical gas analyzer pairing.
Soda-Anthraquinone-Catalyzed Delignification of Coconut Husk Waste Eka Fitriani Ahmad; Puji Lestari; Katharina Oginawati; Yoki Yulizar; Julinton Sianturi; Muhammad Miftahul Munir; Adawiah Adawiah
Bulletin of Chemical Reaction Engineering & Catalysis 2026: BCREC Volume 21 Issue 1 Year 2026 (April 2026)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20537

Abstract

This study investigates the role of anthraquinone (AQ) in decomposing coconut husk waste, specifically collected from Banten, to produce pure α-cellulose pulp. The process used sodium hydroxide (NaOH) at 10%, 15%, and 20% concentrations, with 0.1 g of AQ added as a catalyst, and a waste-to-liquid ratio of 1:8 throughout. The goal is to accelerate lignin degradation while protecting cellulose in the material, thereby yielding higher-quality pulp. The Banten coconut husk analysis showed an α-cellulose content of 30.38%. Higher NaOH concentrations reduced pulp yield but increased lignin removal, indicated by lower kappa numbers. AQ addition enhanced lignin removal and preserved cellulose compared to the absence of AQ. The optimal outcome was achieved with 15% NaOH and 0.1 g AQ, balancing lignin removal and cellulose preservation. These findings indicate that anthraquinone can support sustainable pulp production from agricultural waste. Copyright © 2026 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Adawiah Adawiah Alfianto, Prayudha Nur Asistia Krisanti Betha Januardi Budaya Budaya, Betha Januardi Della Devia Devia, Della Eka Fitriani Ahmad Januar Arif Fatkhurrahman Julinton Sianturi Katharina Oginawati Krisanti, Asistia Muhammad Miftahul Munir Muliane, Ulfi Prayudha Nur Alfianto Sembiring, Emenda Sofyan, Asep Yoki Yulizar