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All Journal Reaktor International Journal of Renewable Energy Development TEKNIK METANA Jurnal Ilmu Lingkungan JURNAL TEKNOLOGI KIMIA DAN INDUSTRI Seminar Nasional Teknik Kimia Kejuangan Widyariset Widyariset International Journal of Environmental, Sustainability, and Social Science Jurnal Teknik Kimia Indonesia Automotive Experiences Jurnal Profesi Insinyur Indonesia International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis IJF (Indonesia Jurnal Farmasi) Journal of Engineering and Technological Sciences
Didi Dwi Anggoro
Chemical Engineering Department, Engineering Faculty, Diponegoro University Jl. Prof. Soedarto, SH, Tembalang, Semarang 50239, Telp.(024)7460058
Aerospace Engineering Agriculture, Biological Sciences & Forestry Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Electrical & Electronics Engineering Energy Engineering Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Library & Information Science Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Neuroscience Physics Social Sciences Transportation

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Effect of ultrasound-advanced oxidation processes for pretreatment of oil palm mesocarp fiber for cellulose extraction Anggoro, Didi Dwi; Prasetyaningrum, Aji; Udaibah, Wirda; Imtinan, Alifa Bakhitah; Nabilah, Farhanah; Le Monde, Brilliant Umara
International Journal of Renewable Energy Development Vol 13, No 3 (2024): May 2024
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2024.60027

Abstract

Palm mesocarp fiber, a by-product of the palm oil industry, holds significant potential as a cellulose source for biofuel, biopolymer, and biocomposite production. However, its utilization is hampered due to the presence of lignin, which covers the cellulose. The use of ozone promotes a high level of lignin degradation, making it efficient in breaking down lignin bonds in lignocellulose. However, the ozonation method has low ozone mass transfer. This deficiency can be overcome with ultrasonic waves because of the cavitation phenomenon that can expand the contact surface of ozone and lignocellulose. The ozonation-ultrasonic hybrid method is used to remove lignin. This research investigates the use of a hybrid ozonation-ultrasonic method with the effect of reaction time and pH under acidic conditions on the pretreatment of palm oil mesocarp fiber. This process was carried out at reaction times (70, 80, and 90 minutes) and solution pH (4, 5, and 6) with an ozone flow rate of 2 L min-1. The cellulose content was analyzed using the Chesson method. The results showed a decrease in lignin and an increase in cellulose, which was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) analysis shows a decrease in the lignin absorption peak at 1635 cm-1 and 1420 cm-1. XRD analysis showed an increase in crystallinity after pretreatment, with lignin degradation observed at 6.35%. SEM Morphological showed a more friable, stable, and porous surface after pretreatment, indicating the presence of perforations in the cell walls and the damage to the lignin structure. Therefore, this research succeeded in reducing the use of chemicals in the biomass waste delignification process. The ozonation-ultrasonic hybrid pretreatment process, which aims to degrade lignin in palm fiber biomass, shows promising results, producing high cellulose content in palm fiber by reducing the amount of chemicals as mostly used in conventional processes.
Acidic Deep Eutectic Solvent as a Catalyst for the Esterification of Levulinic Acid to Ethyl Levulinate Jamarudin, Aizah; Zainol, Muzakkir Mohammad; Hassan, Abdull Hafidz; Ismail, Siti Norazian; Asmadi, Mohd; Zainuddin, Kamarul Ridwan; Yusof, Nurul Asyikin; Anggoro, Didi Dwi
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20253

Abstract

Deep eutectic solvents (DESs) are environmentally friendly compounds that can be synthesized through the combination of hydrogen-bond donors and acceptors. The diverse applications of DESs underscore their potential as catalysts in various chemical reactions. In this study, an acidic DES was prepared as a catalyst for levulinic acid (LA) esterification with ethanol to produce ethyl levulinate (EL). The acidic DES was prepared from choline chloride and sulfanilic acid through thermal mixing. Characterization of the DES was conducted using Fourier transform infrared-attenuated total reflectance and nuclear magnetic resonance spectroscopy analysis to identify its functional groups and confirm the structure. Additionally, the thermal stability of the DES was analyzed using thermogravimetric analysis, while its acidity was determined using acid-base titration. The esterification of LA with ethanol was assessed under reflux conditions at 80 °C, with specific parameters examined: the molar ratio of LA to ethanol (ranging from 1:5 to 1:13), the ratio of LA to DES (ranging from 1:0.4 to 1:1.4), and the reaction duration (0.5–5 h). The DES used in this work showed an acidity of 2.89 mmol/g. The optimum conditions were obtained at a 1:7 molar ratio of LA to ethanol, a 1:1.2 ratio of LA to DES, and 3 h of reaction time at 80 °C, resulting in 99% conversion of LA to EL. This finding highlights the remarkable catalytic performance of the choline chloride/sulfanilic acid DES in facilitating a highly efficient conversion of LA to EL. Copyright © 2025 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).
Impact of crosslinking on quaternary ammonium poly(vinyl alcohol)/polyquaternium-7 anion exchange membranes for alkaline polymer electrolyte fuel cells Samsudin, Asep Muhamad; Rokhati, Nur; Prasetya, Nor Basid Adiwibawa; Kumoro, Andri Cahyo; Anggoro, Didi Dwi; Nasher, Kharissa; Wahyudi, Dhiky; Roschger, Michaela; Hacker, Viktor
International Journal of Renewable Energy Development Vol 14, No 4 (2025): July 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60897

Abstract

Alkaline Polymer Electrolyte Fuel Cells (APEFCs) have emerged as a promising candidate for clean energy production. Anion exchange membrane (AEM) is an essential element of alkaline polymer electrolyte fuel cells for its role in facilitating hydroxide ion conduction. The objective of this study is to investigate the effect of a glutaraldehyde-based crosslinker solution on the performance of anion exchange membranes (AEMs) fabricated using quaternary ammonium poly (vinyl alcohol) (QPVA) as the backbone polymer and polyquaternium-7 as the second polymer. The introduction of a glutaraldehyde-based crosslinking agent was purposed to enhance membrane stability and reduce excessive swelling. The study evaluates the impact of varying glutaraldehyde concentrations on membrane performance. FTIR analysis confirms the presence of key functional groups of QPVA, polyquaternium-7, and the crosslinking agent. SEM images reveal that the membranes demonstrate dense and homogeneous physical structure. The results show that water uptake, swelling degree, ion exchange capacity (IEC), and hydroxide conductivity are influenced by the concentration of the glutaraldehyde solution. The QP-GA-13 AEM exhibited the best overall performance, achieving the highest tensile strength of 31.1 MPa and the highest hydroxide ion conductivity of 4.15 mS cm⁻¹ at 70°C. In single-cell tests, this membrane delivered a maximum power density of 85 mW cm⁻² and a current density of 350 mA cm⁻² at 80°C under humidified oxygen conditions.
Free hydrogen-deoxygenation of waste cooking oil into green diesel over Ni-Marble waste catalyst: Optimization and economic analysis Anggoro, Didi Dwi; Prasetyoko, Didik; Hartati, Hartati; Zakaria, Zaki Yamani; Le Monde, Brilliant Umara; Nurdiani, Maulida
International Journal of Renewable Energy Development Vol 14, No 6 (2025): November 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.61241

Abstract

Diversifying energy through alternative sources, such as biofuels, is a practical and accessible option in Indonesia. This study aimed to optimize the yield of biofuel (green diesel) using Ni/marble waste as a catalyst. Deoxygenation offers a promising route for converting waste cooking oil (WCO) into valuable products. A Box–Behnken Design (BBD) was applied to assess the effects of key variables on the deoxygenation process using Response Surface Methodology (RSM). The variables included reaction time (2–6 h), reaction temperature (360–380 °C), and catalyst weight (1–3% w/w), with conversion percentage as the response. The results showed that reaction time and catalyst weight significantly influenced WCO deoxygenation (p < 0.05). The optimum conditions for maximum conversion were a reaction temperature of 373.64 °C, a catalyst weight of 3.45% w/w, and a reaction time of 4.35 h. Under these conditions, hydrocarbon selectivity reached 92.26%. Paraffins were the dominant fraction, confirming that the Ni/marble catalyst efficiently promoted deoxygenation with high selectivity toward C15–C18 hydrocarbons. These findings align with the proposed reaction mechanism, which involves decarboxylation, decarbonylation, and hydrodeoxygenation pathways. An economic evaluation under optimal conditions estimated a profit of $1.0469 per batch, demonstrating that converting waste cooking oil into green diesel is both technically feasible and economically attractive. Overall, integrating waste-derived catalysts with optimized deoxygenation technology provides a sustainable and profitable solution.
Sistem Pendukung Keputusan Evaluasi Kinerja Safety Management System di Bandara menggunakan Metode DEMATEL dan ANP Rolita, Lisa; Anggoro, Didi Dwi; Indriyantho, Bobby Rio
Jurnal Profesi Insinyur Indonesia Vol 3, No 2 (2025): JPII
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jpii.2025.26844

Abstract

Berdasarkan Peraturan Menteri Perhubungan Nomor KM. 20 Tahun 2009 tentang Sistem Manajemen Keselamatan (Safety Management System), penyedia layanan penerbangan harus menerapkan Safety Management System untuk mengenali ancaman keselamatan dan mengurangi risiko, mempertahankan suatu tingkat keselamatan yang dapat diterima dan dilaksanakan, menyediakan pengamatan dan penilaian tingkat keselamatan agar tercapainya tujuan peningkatan tingkat keselamatan secara menyeluruh. Untuk meningkatkan kinerja Safety Management System pada bandara, perlu dilakukan evaluasi untuk memperbaiki kekurangan dan memastikan kualitas keselamatan secara optimal. Penelitian ini mengintegrasikan metode DEMATEL dan ANP pada Sistem Pendukung Keputusan dalam menganalisis hubungan sebab-akibat dari kriteria yang bertujuan untuk membantu stakeholder dalam mengambil keputusan. Metode yang digunakan dalan penelitian menerapkan metode kualitatif melalui kuesioner online dan diproses untuk menentukan hasil penilaian dari subkriteria. Metode DEMATEL membantu mengidentifikasi hubungan antar kriteria, serta metode ANP membantu menentukan pembobotan dari subkriteria. Studi kasus dilakukan pada bandara Ahmad Yani Semarang dengan hasil evaluasi menunjukkan bahwa penilaian tertinggi adalah kebijakan keselamatan dan tujuan, sedangkan penilaian terendah pada subkriteria pendidikan dan/atau pelatihan, sehingga menjadikan subkriteria ini menjadi prioritas yang perlu diperbaiki dalam kinerja Safety Management System bandara tersebut. Kata kunci: Sistem Pendukung Keputusan, Safety Management System, Bandara, DEMATEL, ANP
Hybrid Ultrasound and Advanced Oxidation Process Regeneration of Spent FCC Catalysts: Optimization and Their Catalytic Performance Anggoro, Didi Dwi; Buchori , Luqman; Rinaldi, Nino; Silviana , Silviana; Le Monde, Brilliant Umara; Putra, Muhammad Fadila; Zainol, Muzakkir Mohamad
Journal of Engineering and Technological Sciences Vol. 58 No. 2 (2026): Vol. 58 No. 2 (2026): April
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2026.58.2.6

Abstract

This study investigated the regeneration of spent fluid catalytic cracking (FCC) catalysts, which become inactive due to the accumulation of poisons at active sites. The objective of the study was to enhance acidity by regenerating spent FCC catalysts through ultrasonic and oxidation processes (UAOPs) and evaluate their effectiveness in synthesizing glycerol monostearate (GMS). The results demonstrate that spent FCC catalysts regenerated with UAOPs can significantly increase catalyst acidity, which plays a crucial role in GMS synthesis. The optimal conditions identified were temperature X1 (60 °C), regeneration time X2 (50 minutes), and flow rate X3 (9 L/h). This optimization was conducted using the Statistica 10 software, resulting in an optimal acidity value of 0.08460 mmol/gram. The GMS yield achieved was 25.33%, which was slightly higher than the yield reported in previous studies utilizing ZSM-5 and dealuminated Y catalysts for the synthesis of glycerol monostearate. Overall, this study suggests that spent FCC catalysts have potential applications in GMS synthesis
Assessing the Suitability of Communal Toilet Models for Achieving the Sustainable Development Goals in Urban Settlements of West Java Sari, Yenita Sandra; Anggoro, Didi Dwi; Alkhozahe, Hussein; Ozel, Cenap
International Journal of Environmental, Sustainability, and Social Science Vol. 7 No. 2 (2026): International Journal of Environmental, Sustainability, and Social Science (Mar
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v7i2.1914

Abstract

This study investigates communal toilet models as an alternative sanitation soliution for densely populated urban settlements and their potential contribution to sustainable development targets related to safe sanitation. In many high-density settlements, limited land availability and infrastructure constraints prevent households from having private sanitation facilities, leading communities to rely on shared sanitation systems. This resarch applies a mixed-method approach combining quantitative and qualitative data. Primary data were collected from four sub districts in Bandung, Wes Java, Indonesia, involving 40 household respondents and 100 key informarmants during the period 2024-2025. Additional information on social, economic, and demographic characteristics was obtained through structured questionnaires. The analysis evaluates communal toilet construction models that consider land availability and water supply conditions, as well as two waste treatment scenarios designed for facilities serving up to 120 users. The results indicate that the second scenario provides greater flexibility in spatial adaptation and more manageable waste treatment for dense settlements. The findings emphasize that appropriate design, effective waste management, accessibility, and affordability are essential factors for improving sanitation services in high-density urban areas. This study highlights the importance of adaptive communal sanitation systems as a practical approach to expanding sanitation access and supporting sustainable urban development in densely populated settlements.
Pembuatan Briket Arang Dari Campuran Tempurung Kelapa dan Serbuk Gergaji Kayu Sengon Didi Dwi Anggoro; Muhammad Hanif Dzikri Wibawa; Moch Zaenal Fathoni
TEKNIK Vol 38, No 2 (2017)
Publisher : Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (589.868 KB) | DOI: 10.14710/teknik.v38i2.13985

Abstract

Indonesia merupakan negara tropis yang memiliki potensi dalam pengembangan energi terbarukan berupa energy biomassa dari briket tempurung kelapa. Briket ini merupakan hasil pengolahan limbah biomasa, diantaranya tempurung kelapa dan serbuk kayu. Tujuan penelitian ini adalah untuk mengetahui pengaruh suhu, konsentrasi perekat dan komposisi bahan baku terhadap nilai kalor  briket. Bahan yang digunakan antara lain serbuk gergaji sengon, tempurung kelapa, tepung tapioka, aquadest. Alat yang digunakan kiln drum, alat pengempa briket, bom kalorimeter, oven, alat screening. Variabel berubah dalam percobaan adalah komposisi bahan baku dan kadar perekat. Langkah penelitian dilakukan dengan pengarangan bahan baku, pencampuran komposisi bahan baku dengan variabel perekat, pencetakan dan pengempaan, uji coba nilai kalor, terakhir analisa data. Hasil pengujian nilai kalor briket bahwa semakin banyak komposisi bahan yang memiliki kalor lebih tinggi maka nilai kalor  campuran briket akan semakin tinggi. Nilai kalor briket sampel tidak memenuhi syarat untuk briket arang buatan Amerika, Inggris, dan Jepang namun diantaranya memenuhi syarat standar nasional Indonesia. Penambahan perekat dalam  pembuatan briket tempurung kelapa dimaksudkan agar partikel arang saling berikatan dan tidak mudah hancur, namun penambahan perekat yang berlebih akan menurunkan kualitas briket, semakin tinggi kadar perekat maka nilai kalor akan berkurang
Assessing the Suitability of Communal Toilet Models for Achieving the Sustainable Development Goals in Urban Settlements of West Java Yenita Sandra Sari; Didi Dwi Anggoro; Hussein Alkhozahe; Cenap Ozel
International Journal of Environmental, Sustainability and Social Science Vol. 7 No. 2 (2026): International Journal of Environmental, Sustainability, and Social Science (Mar
Publisher : PT Keberlanjutan Strategis Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.38142/ijesss.v7i2.1914

Abstract

This study investigates communal toilet models as an alternative sanitation soliution for densely populated urban settlements and their potential contribution to sustainable development targets related to safe sanitation. In many high-density settlements, limited land availability and infrastructure constraints prevent households from having private sanitation facilities, leading communities to rely on shared sanitation systems. This resarch applies a mixed-method approach combining quantitative and qualitative data. Primary data were collected from four sub districts in Bandung, Wes Java, Indonesia, involving 40 household respondents and 100 key informarmants during the period 2024-2025. Additional information on social, economic, and demographic characteristics was obtained through structured questionnaires. The analysis evaluates communal toilet construction models that consider land availability and water supply conditions, as well as two waste treatment scenarios designed for facilities serving up to 120 users. The results indicate that the second scenario provides greater flexibility in spatial adaptation and more manageable waste treatment for dense settlements. The findings emphasize that appropriate design, effective waste management, accessibility, and affordability are essential factors for improving sanitation services in high-density urban areas. This study highlights the importance of adaptive communal sanitation systems as a practical approach to expanding sanitation access and supporting sustainable urban development in densely populated settlements.
Co-Authors Afriza Ni&#039;matus Sa&#039;adah Aji Prasetyaningrum Alkhozahe, Hussein Andri Cahyo Kumoro Anindita Indriana Anisa Widia Utami Antonio Giovanno Aprilina Purbasari Arif Budiarto Asep Muhamad Samsudin, Asep Muhamad Asmadi, Mohd Bintang Ayu Kalimantini Bobby Rio Indriyantho Buchori , Luqman Cantika Aulia Salsabila Cenap Ozel Chusnul Khotimah Diah Anggraeni Jatraningrum Dian Cahyaningrum Didik Prasetyoko Dyah Hesti Wardhani Dyah Hesti Wardhani Fachmy Adji Pangestu Setiawan Fadhil Rifqi P Faleh Setia Budi FatmaTsaniya Chamdani Febio Dalanta Ganish Eko Mayndra Giveni Christina Silaen H Hadiyanto Hacker, Viktor Hartati Hartati Hartuti Purnaweni Hassan, Abdull Hafidz Herawati Oktaviani Herawati Oktavianty Hermawan, Hermawan Herry Santosa Hussein Alkhozahe I. Istadi Imtinan, Alifa Bakhitah Indro Sumantri Ismail, Siti Norazian Jamarudin, Aizah Kamsi Nur Oktavia Kevin Aprilio Le Monde, Brilliant Umara Luqman B Luqman Buchori Lutfi Af’idatul Kamilah Melissa Justine Renjaan Moch Zaenal Fathoni Muhamad, Theobroma Guntur Muhammad Hanif Dzikri Wibawa Nabilah, Farhanah Nasher, Kharissa Nerfiana Fradevi Nino Rinaldi Nita A Nita Aryanti Nor Aishah Saidina Amin Nor Basid Adiwibawa Prasetya Nur Hidayati Nur Rokhati Nurcahyani, Septra Nurdiani, Maulida Nurushofa, Faustina Alda Ozel, Cenap P Purwanto Pakpahan, Agnes J. Pakpahan, Andre W. S. Prihiyandhoko, Hageng Primasatya, Dimas Priyo Atmaji Putra, Muhammad Fadila Putri Anggraeni Resti Nur Utami Riko Rikardo Putra Riko Rikardo Putra Riskatama Atmaji Rispiandi Rispiandi Riyanto, Teguh Rohmadona H Rolita, Lisa Roschger, Michaela S Subandriyo Salsabila, Unik Hanifah Saputra, Roni Ade Sari Octavianingrum Setia Budi S Setia Budi Sasongko Setiadi, Iqfan Dwi Sigit B Silviana , Silviana Silviana Silviana Slamet Supriyadi Sulardjaka Sulardjaka Teguh Riyanto Triani, Meiri Udin Mabruro Vitus Dwi Yunianto Budi Ismadi Wahyu Bahari Setianto Wahyu Bahari Setianto Wahyudi, Dhiky Wirda Udaibah Yayuk Astuti Yayuk Mundriyastutik Yenita Sandra Sari Yusof, Nurul Asyikin Zainol, Muzakkir Mohamad Zainol, Muzakkir Mohammad Zainuddin, Kamarul Ridwan Zakaria, Zaki Yamani Zaqiyah Addarojah Zulfikar Muriadiputra