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All Journal Reaktor Jurnal Sains dan Teknologi Mechatronics, Electrical Power, and Vehicular Technology Jurnal Sains Materi Indonesia Jurnal Sains dan Teknologi Jurnal Online Mahasiswa (JOM) Bidang Teknik dan Sains Indonesian Journal of Tropical and Infectious Disease Elkawnie Konversi Journal Of Chemical Process Engineering (JCPE) Indonesian Journal of Chemistry Communications in Science and Technology Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Teknomekanik Unri Conference Series: Community Engagement Journal of Applied Materials and Technology Journal of Bioprocess Chemical and Environmental Engineering Science Journal of Community Engagement Research for Sustainability SAINSTEK Estungkara: Jurnal Pengabdian Pendidikan Sejarah International Journal of Renewable Energy Development Journal Of Chemical Process Engineering JURNAL REKAYASA KIMIA & LINGKUNGAN Journal of Engineering and Technological Sciences Rekayasa: Jurnal Penerapan Teknologi dan Pembelajaran
Amun Amri
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Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities 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 Education Electrical & Electronics Engineering Energy Engineering Environmental Science Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Nursing Public Health Social Sciences Other

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Experimental and DFT investigation of LiFePO₄/graphene composites prepared via shear exfoliation route Amun Amri; Mawaddah Mawaddah; Alfatlian Alfatlian; Sunarno Sunarno; Fri Murdiya; Mazhibayev Assylzhan; Khairulazhar Jumbri; Mohammednoor Altarawneh; Chun-Chen Yang; Sulistyo Saputro; M Mahbubur Rahman
International Journal of Renewable Energy Development Vol 15, No 2 (2026): March 2026
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2026.61976

Abstract

The performance of LiFePO₄ (LFP) cathodes was successfully enhanced by incorporating two types of graphene obtained through green and low-cost liquid shear exfoliation processes. Commercial LFP was combined with few-layer graphene (FLG) and very few-layer graphene (VFLG), with compositions ranging from 0-4 wt.%. LFP, LFP/FLG, and LFP/VFLG, were characterized using electrochemical impedance spectroscopy (EIS), charge–discharge (CD), XRD, FTIR, and FESEM–EDX. Density functional theory (DFT) calculations were further employed to probe the electronic structure of LFP and an idealized LFP(001)/pristine-graphene interface as a baseline model for interfacial electronic coupling. DFT indicated interfacial charge redistribution and the emergence of C-2p π-derived states near the Fermi level, resulting in bandgap narrowing relative to pristine LFP and suggesting an additional electronic percolation pathway at the interface. Experimentally, EIS showed that VFLG reduced charge-transfer resistance and increased effective electrochemical conductivity, while FLG addition was associated with improved interfacial charge-transfer behavior inferred from EIS. CD tests at 0.5 C showed that the 4 wt.% FLG and 4 wt.% VFLG electrodes delivered the highest specific capacities of 29.98 mAh/g and 44.66 mAh/g, corresponding to increases of 81.9% and 170.5% compared to bare LFP. XRD and FTIR confirmed that LFP phase integrity was maintained, and FESEM–EDX revealed a uniform particle distribution with well-dispersed graphene networks. Overall, these results demonstrated that shear-exfoliated graphene effectively improved electronic connectivity and charge-transfer behavior in LFP cathodes, supported by consistent electrochemical measurements and electronic-structure insights from DFT.
Synthesis of biochar from fronds palm waste as a support for CaO catalyst Vito Oktariandi; Zuchra Helwani; Irfan Sarhadi Akbar; Muhammad Dian Rizky; Putri Anjani; Rendy Putra Perdana; Amun Amri
Konversi Vol 13, No 2 (2024): OKTOBER 2024
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v13i2.20242

Abstract

Production palm oil-based biodiesel production itself has been widely developed in Indonesia to replace fuel because the palm oil commodity has the greatest potential for biodiesel for biodiesel production. The use of catalysts affects the production of biodiesel because it can accelerate the production of biodiesel which is needed. Materials that has the potential to be part of the catalyst is activated carbon from palm frond waste palm. Palm frond waste has great potential and is supported by its lignocellulosic component. lignocellulose component, so it can be utilized as activated carbon. Research This research has variations in the procedure, namely pyrolysis temperature variations of 450°C and 500°C, pyrolysis time of 15 minutes and 20 minutes as well as the base used in impregnation, namely NaOH and KOH. The catalyst that has been The synthesized catalyst was characterized using XRD and BET analysis. XRD testing XRD testing obtained the smallest particle size on the 500°C CaO/NaOH/Biochar catalyst with a pyrolysis time of 15 minutes amounting to 26.925732 nm and in the BET test, the smallest particle size was obtained. BET testing obtained the largest catalyst surface area on CaO/NaOH/Biochar catalyst 500°C with pyrolysis time of 15 minutes amounted to 8.1626 m2/g.
Fabrication and Photocatalytic Performance of ZnO-Biochar Composites for Eliminating Dye Waste Desi Heltina; Danil Yoselino; Nabellia; Agustina Dumaria; Khairati Amila; Komalasari; Maria Peratenta Sembiring; Amun Amri; Zhong Tao Jiang
Communications in Science and Technology Vol 10 No 2 (2025)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.10.2.2025.1795

Abstract

The synthesis of the ZnO-biochar composite from palm kernel shell biomass waste has been accomplished through the utilization of thesolvothermal method, yielding a satisfactory outcome. The resulting composite, a combination of ZnO and biochar, has been utilized in the degradation of methylene blue waste compounds. The objective of this research is to synthesize ZnO-biochar composites from palm shells, and to determine the optimal solvothermal temperature and duration. This research was initiated with the preparation of palm shells into biochar. Subsequently, the ZnO-biochar composite was synthesized with variable solvothermal temperatures and solvothermal times. The ZnO-biochar composite was characterized using analytical techniques including SEM-EDX, FT-IR, XRD, BET and UV-vis DRS. The most effective degradation of methylene blue was exhibited by the ZnO-biochar composite sample synthesized at a solvothermal temperature of 180 ̊C and a solvothermal time of 10 hours, achieving a degradation of 88.29%. The enhanced photodegradation performance of this composite sample is attributed to its high surface area, capacity for visible light absorption, and the dimensions of the active crystals, which can account for the high performance of the ZnO-biochar composite for photocatalytic degradation.
Koh Catalyst Concentration and Stirring Speed in The Transesterification Process on Biodiesel Yield from Spent Coffee Grounds Oil Desi Heltina; Fadrian Oktori; Amun Amri; Agustina Dumaria; Maria Peratenta Sembiring
JST (Jurnal Sains dan Teknologi) Vol. 15 No. 1 (2026): April
Publisher : Universitas Pendidikan Ganesha

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23887/jst-undiksha.v15i1.92848

Abstract

Coffee grounds have a fairly high oil content in the seeds of around 15-20% which has great potential to be used as raw material for making biodiesel. This study aims to determine the physical characteristics of coffee grounds biodiesel; and to determine the effect of stirring speed, amount of catalyst and reaction time on the yield of coffee grounds biodiesel. The type of research on biodiesel production from coffee grounds waste is quantitative. The data collection method is carried out by experimenting on biodiesel that has been obtained from coffee grounds waste oil on the concentration of KOH catalyst, stirring speed and reaction time. After the required data has been collected, an analysis is carried out using a descriptive and analytical case study method. The result of the study obtained the best condition, namely at a KOH catalyst concentration of 3% wt oil, and a stirring speed of 800 rpm, a biodiesel yield of 30,19%. So it can be concluded that coffee grounds oil biodiesel has been successfully obtained and has met the quality standards of ASTM D6751 and EN 14214. The yield of biodiesel produced increased along with the increasing transesterification reaction time. GC-MS analysis showed that coffee grounds oil biodiesel was mostly composed of linoleic acid and palmitic acid. The implications of this research can be used in the development of further research related to innovations in improving environmentally friendly fuels based on organic waste.
The Effectiveness of Silver Nanoparticles Synthesized from Rosella (Hibiscus sabdariffa L.) Flower Extract for Photodynamic Antimicrobial Therapy Against Staphylococcus Ahmad Faisal Islamudin; Fransiska Maria Aprihapsari; Elmira Rofida Alhaq; Rohadatul Aisya; Khusnul Ain; Suryani Dyah Astuti; Inten Firdhausi Wardhani; Amun Amri
Indonesian Journal of Tropical and Infectious Disease Vol. 14 No. 2 (2026): Vol. 14 No. 2 (2026)
Publisher : Institute of Topical Disease Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/ijtid.v14i2.82069

Abstract

Green synthesis of silver nanoparticles (AgNPs) using plant extracts has drawn growing interest for its potential to enhance antibacterial activity. This study evaluates the antibacterial performance of AgNPs synthesized from rosella (Hibiscus sabdariffa L.) flower extract, assessed through several characterization and antibacterial tests. The extract was prepared by macerating 10 g of rosella powder in 150 mL double-distilled water for five days, then filtering the mixture. It was combined with 3 mM AgNO₃ at a 1:9 ratio and exposed to microwave irradiation at 200 W for 5, 10, 15, and 20 minutes to examine how irradiation time affects nanoparticle formation. UV-Vis spectroscopy and particle size analysis (PSA) were used for characterization, while antibacterial activity was tested via disc diffusion and photodynamic therapy (PDT) with a red laser. UV-Vis spectra showed absorption peaks between 506 and 519 nm, confirming AgNP formation, and PSA showed that longer microwave exposure produced smaller particles, ranging from 1 to 27 nm with an average of 5.74 nm. The disc diffusion assay yielded only a 1.85 mm inhibition zone, indicating weak antibacterial activity against S. aureus. PDT, however, achieved markedly better results, with up to 68% bacterial reduction under optimal conditions, though the AgNPs-R4 sample showed reduced efficiency due to a mismatch between laser wavelength and particle absorbance—smaller particles have a wider energy gap, shifting absorbance to shorter wavelengths. These results highlight the need to optimize synthesis conditions for consistent, maximal antibacterial performance.
SIMULASI GASIFIKASI SLUDGE LIMBAH INDUSTRI PULP DAN KERTAS Rusydy; Amun Amri; Ahmad Fadli
Jurnal Sains dan Teknologi Vol 14 No 2 (2015): Jurnal Sains dan Teknologi
Publisher : Fakultas Teknik - Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Pulp and paper industry generates solid waste around 3-4% of the total production, mostly form in sludge from the Waste Water Treatment Plant. Sludge gasification is one such technology processing sludge into syngas. The purpose of this research was to study the factors that influence the pulp and paper industry sludge gasification into syngas. This research was conducted by simulating the sludge process gasification in the fluidized bed gasifier using Aspen Plus v8.0 software. Configuration process is set out in this study is a fluidized bed gasification systems to feed sludge using O2 and steam as gasification agent. Some stages considered in the ASPEN Plus simulation to show the entire process of gasification, ie the decomposition of sludge, combustion of volatile substances, char gasification and gas-solids separation. In this simulation used sludge with ultimate value (dry basis): 48.0% C; 5.7% H; 36.3% O; 0.8% S; 1.2% N; and proximate (dry basis): water content of 40.90%; ash of 8.70%; Volatile Matter 52.1%; Fixed Carbon 41.82%; LHV 9.5 MJ / kg. Variable research: reactor temperature 600-800oC, ER 0.20 to 0.35 kg/kg, S/B 0.20-0.35 kg/kg and fixed variable operating pressure of 1 atm, sludge flow rate of 100 kg/min. The reactor temperature, Equivalent Ratio (ER), Steam/Sludge ratio (S/S) are factors that are very influential in the sludge gasification process. Increased temperatures cause the concentration of hydrogen in the syngas increased considerably (from 24.84 to 35.19%) and reduces the conversion of CO (17.07 to 15.45%). Increased ER reduces the conversion of syngas -15.85% and increase the percentage of CO2 (26.40-35.99%), ER optimum between 0.2-0.3. High steam-sludge ratio can reduce the temperature of reactor which have an effect on the rate of gasification, S/B optimum between 0.20-0.25.
Co-Authors AA Sudharmawan, AA Abda Abda Abdul Rasyid Amrin Abid, Hussein Rasool Achmad Noerkhaerin Putra Adrianto Ahmad Affandi Affandi Agustina Dumaria Agustina Dumaria Ahmad Fadli Ahmad Fadli Ahmad Faisal Islamudin Aisyah Dewi Ranti, Aisyah Dewi Alfarizi, Cory Dian Alfatlian Alfatlian Ali Novia Altarawneh, Mohammednoor Aman Aman Aman, Azka Aminati, Ikha Setya Amir Awaluddin Amri, Evelyn Andrizal Andrizal Ani Suryani Annisa Rahmat Apriadi Rio Ari Sandhyavitri Arisman Adnan Assylzhan, Mazhibayev Azhar, Muhammad Rizwan Azhari Harahap Azridjal Aziz Bahri, Ahmad Syaiful Bahruddin Bahruddin Benny Ahmadi Bona Tua Chairul Chairul Chairul Chun-Chen Yang Damayanti, Elok Danil Yoselino Deden Saprudin Dedeng Hermoyo Derry Hanriansyah Pratama Desi Heltina Dhina Febryza Dhini Octavianty Diana Eka Putri Dimas Nofriyan Dwi Setyo Pambudi, Yoyok Ekawati, Lestari Elmira Rofida Alhaq Elmira, Kambarova Erliza Hambali Esty Octiana Sari Esty Octiana Sari Eva Rantika Evelyn Evelyn Evelyn Evelyn Evi Nadhifah Fabryza, Dhina Fadrian Oktori Fajar Restuhadi Fajrina Qaishum Fakhri, Fakhri Fauziyah, Hidayatul Febri Riandi Febrizal Ujang Febryza, Dhina Feby Pratama Nugraha Fesya Putri, Andini Firman syah Fitri, Lara Ismano Fransiska Maria Aprihapsari Fri Murdiya Fri Murdiya, Fri Gilang Fathurrahman Gilda Miranda Gussyafri Hasnul Bustaman Hawa, Karfika Ainil Hawa, Karfika Ainil Hendri, Yola Bertilsya Hendro Ekwarso Heni Sugesti Heri Rahmana Hussein A. Miran Indra Yasri Inten Firdhausi Wardhani Irfan Sarhadi Akbar Irwan Irwan Is Sulistyati Isna Rahma Dini Iwantono Iwan Barnawi Jhon Armedi Pinem Jiang, Zhong Tao Jumbri, Khairulazhar Karfika Ainil Hawa Khairat Khairat Khairat Khairati Amila Khairulazhar Jumbri Khusnul Ain Khusnul Ain Komalasari Komalasari Komalasari Komalasari Komalasari Lisa Legawati Lucy Rahmawati M Mahbubur Rahman M. Fauzan Akbar M. Iwan Fermi M. Mahbubur Rahman M. Sugandi M. Yogi Riyantama Isjoni Malindo, Muhammad Eri Maria Peratenta Mawaddah Mawaddah MAYANG SARI Mayangsari Mayangsari Mazhibayev Assylzhan Meliagustin, Adilla Michael Hutapea Miran, Hussein A. Mochamad Reizal Ath Thariq Mohammednoor Altarawneh Monita Olivia Muhamamad Rizky Zuriadi Muhammad Dian Rizky Muhammad Shalahuddin Muhammad Shalahuddin Muhammad Sugandi Muhammad Zaqi Muhdarina Nabellia Nisa Mulya Novan, Andre Novia Azzahra Nurhayati Nurwijayanti Nurwulandari Saputri Ohi, Hiroshi Panca Setia Utama Paul Destin Purba Peter Peter Prawiranegara, Barata Aditya Puji Rahmawati Dwi Sukma Putra, Rahmat Ade Putri Anjani Putri Arini Putri Husni Hidayah, Putri Husni Putri, Diana Eka Rahayu, Ricky Puji Rahmadahana, Suci Rahman, M. Mahbubur Rahmansyah Rahmansyah Rahmat Kurniawan Nasution Rahmi, Sri Wahdini Raihan Daffansyah Sinaga Rani Handayani Rendy Putra Perdana Reni Yenti, Silvia Reski, M. Rifati Hanifa Rino Rinaldi Rizka Aulia Hardi, Rizka Aulia Rohadatul Aisya Rozanna Sri Irianty Russita Martani Russita Martani Rusydy Rusydy ' Salma Liska Salsabilla Diva Voadi Saputra, Adika Saputra, Fakhri Sari Rahma Yanti Sari, Esty Octiana Sarma, Deki Septian, Handika Setiani Br Manurung Silvia Reni Yenti Silvia Reni Yenti Suci Afrianti Sukoco Sukoco Sukoco Sukoco Sulistyo Saputro Sulistyo Saputro SUNARNO Sunarno Sunarno Sunarno Sunarno Suryani Dyah Astuti SYAIFUL BAHRI Syamsu Herman Syelvia Putri Utami Syelvia Putri Utami Syelvia Putri Utami Syukri Hamdani Tafrikhatul Walidah Tao Jiang, Zhong Vito Oktariandi Voadi, Salsabilla Diva Wilda Zakiah Windy Odelia Putri Wira Irawan Rossani Wisrayetti Wisrayetti Wisrayetti Wisrayetti Wisrayetti, Wisrayetti Wulandari, Revika Yang, Chun-Chen Yayan Setiawan Yelmida Azis Yogi Yolanda YOLA BERTILSYA HENDRI Yopalim Zanstra Yosi Alwinda Yosi Alwinda, Yosi Yusnimar Sahan Z Zulfansyah Zhong Tao Jiang Zikri, Ahmed Zuchra Helwani Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar Zultiniar, Zultiniar Zuqni Meldha