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ROHMAH, FAIZATUR
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Waste cooking oil biodiesel via a sodium hydroxide-catalyzed transesterification process: effects on diesel engine performance and emissions Hamid, Abdul; Syafa, Muhammad Badrus; Fatah, Misbakhul; Jakfar, Amin; Rahmawati, Zeni; Purbaningtias, Tri Esti; Fikri, Mohammad Anas; Rohmah, Faizatur; Wilujeng, Auliana Diah
Jurnal Polimesin Vol 23, No 5 (2025): October
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v23i5.7374

Abstract

This study reports the synthesis of biodiesel from locally sourced Waste Cooking Oil (WCO) using sodium hydroxide (NaOH) catalyst. The main objective of this research is to assess the feasibility of utilizing WCO-based biodiesel as a sustainable alternative fuel by analyzing its physicochemical properties and application in a Yanmar® TF 70 LY-DI diesel engine. The production process involved degumming, acid-catalyzed esterification, and base-catalyzed transesterification to address the high free fatty acid content of WCO. The resulting biodiesel met ASTM D6751 standards, with a kinematic viscosity of 5.06 cSt, a flash point of 164°C, a density of 885 kg/m3, a FAME yield of 98.17%, and an acid number of 0.12 mg-KOH/g. Engine tests were performed using blends from B10 to B40 and benchmarked against pure diesel. Results showed that B10 and B20 blends maintained comparable engine performance, while higher blends (B30–B40) exhibited reductions in power and torque and increased Specific Fuel Consumption (SFC). CO emissions decreased significantly with increasing biodiesel content, whereas NO and NOx emissions rose due to higher combustion temperatures. These findings demonstrate the technical feasibility and environmental benefits of WCO-derived biodiesel, particularly at lower blend ratios (≤ B20), as a locally available and sustainable fuel. The study is limited to laboratory-scale testing on a single-cylinder engine without long-term durability assessments, which should be addressed in future studies.
Optimization of Biodiesel Production from Sunflower Oil Using Sodalite-Based Catalyst via Taguchi Method Hamid, Abdul; Jakfar, Amin; Rahmawati, Zeni; Armansyah, Muhammad Doni; Wahyuni, Tri; Purbaningtias, Tri Esti; Febriana, Ike Dayi; Abdullah, Mohammad; Ilmah, Aurista Miftahatul; Rohmah, Faizatur
Jurnal Teknik Kimia dan Lingkungan Vol. 9 No. 2 (2025): October 2025
Publisher : Politeknik Negeri Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33795/jtkl.v9i2.7345

Abstract

The growing demand for alternative fuels has highlighted biodiesel as sustainable substitute for fossil diesel. In this study, biodiesel was produced from sunflower seed oil using heterogeneous catalyst synthesized from natural kaolin into sodalite via hydrothermal process. The synthesized catalyst was characterized using XRD, FTIR and SEM-EDS, confirming the transformation of kaolinite to sodalite. The transesterification reaction was conducted under varying methanol-to-oil molar ratios (1:12, 1:18, and 1:24) and temperatures (60, 65, and 70°C). A Taguchi orthogonal array (L9) was employed to statistically evaluate the effects of these parameters on methyl ester yield. Experimental results showed that both methanol ratio and reaction temperature significantly influenced biodiesel yield, with the highest yield of 90.44% obtained at 70°C and 1:18 molar ratio. Signal-to-noise ratio and ANOVA analysis indicated that the methanol-to-oil ratio was the most dominant factor (46.05%) compared to temperature (40.55%). The resulting biodiesel exhibited a flash point of 158°C, acid value of 0.06 mg-KOH/g, and iodine value of 84.06 g-I₂/100g, satisfying most ASTM D6751 and SNI 7182:2015 standards, though viscosity and density exceeded standard limits. Emission testing showed 16% reduction in CO emissions with increasing biodiesel blends, while NO and NOx emissions slightly increased.
PEMANFAATAN SERABUT KELAPA DAN TRAY TELUR SEBAGAI MATERIAL KOMPOSIT PEREDAM SUARA PADA MOBIL Ulfiyah, Laily; Rohmah, Faizatur; wilujeng, Auliana diah
TURBO [Tulisan Riset Berbasis Online] Vol 12, No 2 (2023): TURBO: Jurnal Program Studi Teknik Mesin
Publisher : Universitas Muhammadiyah Metro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24127/trb.v12i2.2568

Abstract

Kebisingan merupakan suatu masalah yang tengah dihadapi masyarakat Indonesia. Kebisingan dapat direduksi dengan menggunakan material yang dapat meredam dan menyerap bunyi. Material peredam akustik yang banyak digunakan masyarakat umumnya menggunakan glasswool dan rockwool, namun karena harganya mahal maka dibuat beberapa alternatif lain dengan memanfatkan bahan dari alam, yaitu berbahan dasar serabut kelapa dan tray telur. Pembuatan komposit berbahan dasar dari serabut kelapa, dan tray telur dengan matriks resin dan katalis. Pembuatan komposit berbahan dasar serabut kelapa dan tray telur dengan matriks resin dan katalis. Paduan bahan serabut kelapa dan tray tekur dengan komposisi 1:1, 2:1 dan 1:2. Pembuatan komposit menggunakan cetakan triplek dengan tebal 1 cm, lebar 20 cm, dan panjang 20 cm. Komposit yang dibuat diuji nilai koefisien absorpsi suara (α) menggunakan sound level meter dan uji coba dengan balok impedansi. Berdasarkan hasil pengujian koefisien suara (α) pada penelitian ini, ketiga material telah memenuhi nilai α ≥ 0,15 dB. Material B dengan komposisi 2:1 merupakan material yang optimal untuk dijadikan bahan untuk peredam suara pada kabin mobil dengan nilai α 0,4 dB.
Analisa Pengaruh Waktu Penahanan (Holding Time) Pada Proses Tempering Terhadap Sifat Mekanis Baja Karbon Menengah Hasil Pengelasan Fcaw (Flux Core Arc Welding) Padang, Rey Joy Toding; Nanulaita, Nevada. J.M; Talkua , Cley; Lopuhaa, Agustinus O.; Rohmah, Faizatur
Journal Mechanical Engineering Vol. 1 No. 3 (2023): Desember
Publisher : Jurusan Teknik Mesin

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31959/jme.v1i3.2099

Abstract

FCAW (Flux Core Arc Welding) welding is a type of welding process or joining metal materials that uses a heat source from electrical energy which is converted or converted into heat energy. a roll and uses gas as a protector for the weld metal which melts during the welding process. The content of medium carbon steel is 0.3%C - 0.6%C. This carbon steel has advantages compared to low carbon steel, medium carbon steel has stronger mechanical properties with a higher level of hardness than low carbon steel. . Before and after welding carbon steel materials, material testing will be carried out. With this test, it is hoped that the hardness and bending strength of the material will be known. The method used is a quantitative method including experimental research. With a plate thickness of 5mm, a variation of the V seam angle with an angle of 45° with a depth of 2.5mm. Using a stickout height of 5mm by varying the holding time, namely 30 minutes, 60 minutes, 90 minutes for FCAW welding  Keywords: Carbon steel, FCAW (Flux Core Arc Welding), Holding Time, Hardness Test, Bending Test
Pengaruh Kepercayaan dan Tingkat Pendapatan terhadap Minat Menabung Di KSPPS BMT Mandiri Artha Syariah Sumberrejo Mundhori; Rohmah, Faizatur
Al-Muhasib: Journal of Islamic Accounting and Finance Vol. 2 No. 1 (2022)
Publisher : Department of Islamic Accounting, The Faculty of Islamic Economics and Business, State Islamic Institute of Kediri [IAIN Kediri

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30762/almuhasib.v2i1.194

Abstract

The Trust and the daily income rate are one of several factors influencing the people’s interest in saving. So, this study's purpose is to determine the level of trust and income either partially or simultaneously on the interest in saving at KSPPS BMT Mandiri Artha Syariah Sumberrejo. This study uses a quantitative method to analyze the primary and secondary data, consisting of trust, income level, and interest in saving. The analytical method used is multiple linear regression analysis. The results show that the trust and the income rate have a significant and positive effect on interest in saving. The magnitude of the influence of trust and income rate on interest in saving is 0.290 or 29%, this value is indicated by the coefficient of determination (R Square), and the rest (71%) is influenced by other variables not examined in this study. Tingkat kepercayaan dan tingkat pendapatan harian adalah salah satu dari beberapa faktor yang mempengaruhi minat masyarakat untuk menabung. Jadi, tujuan penelitian ini adalah untuk mengetahui pengaruh tingkat kepercayaan dan pendapatan masyarakat terhadap minat menabung di KSPPS BMT Mandiri Artha Syariah Sumberrejo. Penelitian ini menggunakan metode kuantitatif untuk menganalisis data primer dan sekunder, yang terdiri dari tingkat kepercayaan, tingkat pendapatan, dan minat menabung. Metode analisis yang digunakan adalah multiple-linear regression analysis. Hasil penelitian menunjukkan bahwa kepercayaan dan tingkat pendapatan memiliki efek yang signifikan dan positif terhadap bunga menabung.  Besarnya pengaruh trust dan income rate terhadap bunga menabung adalah 0,290 atau 29%, nilai ini ditunjukkan dengan koefisien determinasi (R Square), dan sisanya (71%) dipengaruhi oleh variabel lain yang tidak diteliti dalam penelitian ini.
Biodiesel Synthesis with Different Feedstock Oils: Free Fatty Acid Analysis and Fuel Properties Characterization Hamid, Abdul; Badrus Syafa', Muhammad; Esti Purbaningtias, Tri; Rahmawati, Zeni; Fatah, Misbakhul; Wahyuni, Tri; Dayi Febriana, Ike; Abdullah , Mohammad; Rohmah, Faizatur
Indonesian Journal of Chemical Analysis (IJCA) Vol. 9 No. 1 (2026): Indonesian Journal of Chemical Analysis
Publisher : Universitas Islam Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20885/ijca.vol9.iss1.art2

Abstract

The present study evaluates the feasibility of non-edible and waste oils as sustainable feedstocks for biodiesel production through a two-step esterification–transesterification process. Waste cooking oil, Calophyllum inophyllum oil, and sunflower oil were employed as raw materials, with sodium hydroxide used as the base catalyst during transesterification. The initial free fatty acid content varied significantly among the feedstocks, ranging from 29.38% in Calophyllum inophyllum oil to 3.20% in waste cooking oil and 1.28% in sunflower oil. Acid-catalyzed esterification effectively reduced the free fatty acid levels, enabling efficient conversion during the subsequent transesterification step. Fourier transform infrared spectroscopy confirmed the successful formation of fatty acid methyl esters, indicated by the presence of characteristic ester functional group absorption bands. Methyl oleate is the dominant component in all biodiesel samples, reaching 83.12% in sunflower oil biodiesel. The produced biodiesel exhibited kinematic viscosities of 4.61-5.63 cSt and flash points of 164-175 °C, meeting ASTM D6751 specifications.
Co-Authors Abdul Hamid Abdullah , Mohammad Abdullah, Mohammad Alfian Eko Rochmawan Annafiyah Armansyah, Muhammad Doni Auliana Diah Wilujeng Aurista Miftahatul Ilmah Badrus Syafa', Muhammad Dayi Febriana, Ike Dewi, Ratna Ayu Pawestri Kusuma Esti Purbaningtias, Tri FAQIH, ABDULLAH Fatah, Misbakhul Febriana, Ike Dayi Fikri, Mohammad Anas Hadiwijaya, Lukman Jakfar, Amin Khairun Nisa Lopuhaa, Agustinus O. Mundhori Nanulaita, Nevada. J.M Padang, Rey Joy Toding Praptiningsih, Praptiningsih Purwadhi Purwadhi Rahmawati, Zeni Rina Muhayah Noor Pitri, Rina Muhayah Noor Rodiyah, Anisah Tur Siti Nurhaliza Syafa, Muhammad Badrus Talkua , Cley Tri Esti Purbaningtias tri wahyuni Ulfah, Nadiyah Ulfiyah, Laily Widodo, Ayudisty Ristika Kusumawardhani Wijaya, Septian Dwi Yani Restiani Widjaja, Yani Restiani