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All Journal Logic : Jurnal Rancang Bangun dan Teknologi Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Jurnal Riset Teknologi Industri Eksergi: Jurnal Teknik Energi Industrial Research Workshop and National Seminar
Syarifuddin Oko
Politeknik Negeri Samarinda
Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Mechanical Engineering Other

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Modification of CaO Catalyst with Impregnation Method Using KoH in Biodiesel Synthesis from Waste Cooking Oil Syarifuddin Oko; Andri Kurniawan
Logic : Jurnal Rancang Bangun dan Teknologi Vol 19 No 2 (2019): July
Publisher : Pusat Penelitian dan Pengabdian kepada Masyarakat (P3M) Politeknik Negeri Bali

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (642.709 KB) | DOI: 10.31940/logic.v19i2.1318

Abstract

Chicken eggshells can be used as raw material in the manufacture of CaO catalysts. Increased CaO catalyst activity can be done by the impregnation method. The purpose of this study was to determine the effect of %K on the wet impregnation of CaO catalyst using KOH and to find out the impregnation catalyst (CaO / K2O) on the biodiesel yield. Prepared chicken egg shells were calcined at 900oC for 3 hours. Then the CaO obtained was impregnated using KOH with a variation of % K (5%, 7%, 9% and 12% (w / w)) while heated at 85oC. The impregnation product was calcined at 600oC for 5 hours. The impregnation catalyst (CaO K2O) was applied to the biodiesel synthesis through a transesterification reaction with a mole ratio of 1:12 waste cooking oil: methanol, the amount of catalyst was 1.5% at a reaction temperature of 70°C for 2.5 hours. Based on the results of SEM-EDS analysis, the highest K2O at 7% K was 21.99%), while the highest CaO content was at 9% K by 81.53%. For the highest surface area analysis at 7% K with a surface area of 71.22 m2 / g, alkalinity was 2.59 mmol / g. The best biodiesel was obtained with a yield of 87.17%, kinematic viscosity of 2.89 cSt, water content of 0.032%, density of 0.819 g/ml, methyl ester level of 99.39%.
Sintesis Biodiesel dari Minyak Jelantah Menggunakan Katalis NaOH/CaO/C dari Cangkang Telur Syarifuddin Oko; Mustafa Mustafa; Andri Kurniawan; Karina Nur Eka Putri
Jurnal Riset Teknologi Industri Vol.15 No.2 Desember 2021
Publisher : Balai Riset dan Standardisasi Industri Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26578/jrti.v15i2.6835

Abstract

Produksi minyak bumi mengalami penurunan, dari 346 juta barel pada tahun 2009 menjadi sekitar 283 juta barel di tahun 2018. Biodiesel mulai berkembang seiring adanya pelaksanaan kebijakan mandatori yang mengamanatkan campuran bahan bakar nabati ke bahan bakar minyak sebesar 20% (B20). Minyak jelantah sangat berpeluang untuk dijadikan sebagai bahan baku dalam pembuatan biodiesel karena mengandung trigliserida. Tujuan penelitian ini adalah mengetahui pengaruh jumlah katalis dan rasio massa metanol:minyak terhadap rendemen, densitas, viskositas kinematik, kadar air dan bilangan asam biodiesel. CaO dibuat dengan mengkalsinasi cangkang telur pada suhu 900oC selama 3 jam. CaO diberi C sebagai support dengan perbandingan CaO:C yaitu 1:1 kemudian diimpregnasi dengan  NaOH 35%. Setelah itu dikalsinasi pada suhu 800oC selama 3 jam. Pembuatan biodiesel dilakukan pada suhu 60oC selama 3 jam dengan memvariasikan jumlah katalis 4,5%, 5,5%, 6,5%, 7,5% dan rasio massa metanol:minyak jelantah 0,25:1, 0,5:1, 0,75:1. Hasil biodiesel terbaik diperoleh pada variasi jumlah katalis 4,5% dengan rasio massa metanol:minyak jelantah 0,5:1 dengan hasil rendemen 84,2610%, densitas 0,8652 gr/ml, viskositas kinematik 2,5900 cSt, kadar air 0,0279% dan bilangan asam 0,3375 mgNaOH/gr.
Pemurnian Minyak Jelantah dengan Metode Adsorbsi Menggunakan Arang Aktif dari Serbuk Gergaji Kayu Ulin (Eusideroxylon zwageri) Syarifuddin Oko; Mustafa Mustafa; Andri Kurniawan; Nur Afni Muslimin
Jurnal Riset Teknologi Industri Vol.14 No.2 Desember 2020
Publisher : Balai Riset dan Standardisasi Industri Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26578/jrti.v14i2.6067

Abstract

Minyak goreng merupakan salah satu kebutuhan pokok manusia sebagai bahan pengolah makanan. Penggunaan minyak goreng secara berulang-ulang dan kontinyu pada proses penggorengan akan menurunkan kualitas minyak goreng. Salah satu upaya pengolahan minyak jelantah adalah dengan cara adsorpsi menggunakan arang aktif. Penelitian ini bertujuan untuk mengetahui pengaruh massa arang aktif dan waktu adsorbsi optimal dengan bahan baku serbuk gergaji kayu ulin terhadap penurunan bilangan peroksida,kadar air dan FFA pada minyak jelantah agar memenuhi standar SNI 01-3741:2013 . Arang aktif dari serbuk gergaji kayu ulin yang dikarbonisasi dengan furnace pada suhu 500°Cselama 1 jam lalu aktivasi kimia dengan aktivator H3PO4 10% selama 24 jam dan mengaktivasi fisika pada  suhu 550ºC selama 1 jam, adapun hasil uji proximate  kadar air 0,2498 %,kadar abu 0,1691 %, kadar volatile matter 5,4067  % dan daya serap iod sebesar 872,2509 mg/gr. Arang aktif yang diperoleh digunakan untuk mengadsorpsi minyak goreng bekas dengan variasi jumlah arang sebanyak 1,5 gram, 2,5 gram, 3,5 gram, 4,5 gram, 5,5 gram, 6,5 gram dan 7,5 gram dalam50 gram minyak jelantah variasi waktu adsorbsi 40, 60 dan 80 menit. Hasil terbaik dari penelitian ini adalah massa arang aktif 5,5 gram dan waktu adsorpsinya selama 80 menit dengan kadar air 0,0559 % dan daya serapnya sebesar 97,91 %, kadar FFA 0,5576 % dengan penurunan sebesar 84,15 % dan bilangan peroksida 2,4617 mek/kg dengan penurunan sebesar 89,15 %.
Pengaruh Perbandingan Massa Ca dan C pada Katalis NaOH/CaO/C dalam Sintesis Biodiesel Menggunakan Minyak Jelantah Syarifuddin Oko; Andri Kurniawan; Julia Rahmatina
Prosiding Industrial Research Workshop and National Seminar Vol 12 (2021): Prosiding 12th Industrial Research Workshop and National Seminar (IRWNS)
Publisher : Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (440.495 KB)

Abstract

Pengaruh Perbandingan Massa Ca dan C pada Katalis NaOH/CaO/C dalam Sintesis Biodiesel Menggunakan Minyak Jelantah
ADHESIVE BEHAVIOR OF POLYCAPROLACTONE/HYDROXYAPATITE COATINGS ON 316L STAINLESS STEEL: A DESIGN OF EXPERIMENTS APPROACH Agung Prabowo; Ahmad Fadli; Heni Sugesti; Muh Irwan; Syarifuddin Oko; Gading Bagus Mahardika; Marlinda
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6212

Abstract

Enhancing the adhesive strength of bioactive coatings is crucial for improving the mechanical stability of metallic implants. This study investigates the effects of three processing parameters—sonication temperature (X₁), PCL/HA ratio (X₂), and drying time (X₃)—on the adhesive strength of poly(ε-caprolactone)/hydroxyapatite (PCL/HA) composite coatings applied to 316L stainless steel substrates. A full factorial 23 experimental design was employed, and the results were analyzed using analysis of variance (ANOVA) and regression modeling. The adhesive strength response ranged from 19.62 MPa to 63.27 MPa. Among the factors studied, the PCL/HA ratio had the most significant positive effect, while drying time showed a minor influence. Interaction plots and response surface analyses revealed a synergistic effect between sonication temperature and PCL/HA ratio, contributing to improved bonding at the coating-substrate interface. The optimization results yielded a predicted maximum adhesive strength of 25.76 MPa at a desirability score of 0.03, highlighting the complexity of parameter interactions. These findings underscore the importance of processing conditions in tailoring coating performance for biomedical applications.
GC–MS CHARACTERIZATION OF FATTY ACID ALKYL ESTERS IN BIODIESEL PRODUCED FROM WASTE COOKING OIL Gading Bagus Mahardika; Agung Prabowo; Syarifuddin Oko; Muh Irwan; Alvyano
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 8 No. 1 (2026): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v8i1.6976

Abstract

This study aims to identify and characterize the major compounds in biodiesel produced through the transesterification of vegetable oils using Gas Chromatography–Mass Spectrometry (GC–MS). The analysis was conducted to evaluate the composition of fatty acid esters—specifically Fatty Acid Methyl Esters (FAME) and Fatty Acid Ethyl Esters (FAEE)—which play a crucial role in determining biodiesel quality. Three biodiesel samples were analyzed, revealing dominant peaks at retention times between 15 and 17 minutes, identified as methyl palmitate (C₁₇H₃₄O₂), methyl oleate (C₁₉H₃₆O₂), and methyl stearate (C₁₉H₃₈O₂). The total content of these major esters ranged from 85% to 92%, indicating an efficient conversion of triglycerides into esters. The resulting chemical profile exhibited a balanced proportion of saturated and unsaturated compounds, providing high oxidative stability and favorable cold flow properties. These findings demonstrate that the produced biodiesel meets the requirements of international standards ASTM D6751 and EN 14214, confirming its potential as an environmentally friendly alternative fuel.
Sustainable Production of Biodiesel Using Eggshell-Derived CaO/K₂O Catalyst: Influence of Process Variables and Factorial Design Analysis Agung Prabowo; Syarifuddin Oko; Muh Irwan; Alvyano; Gading Bagus Mahardika
Eksergi Vol. 22 No. 01 (2026): JANUARY 2026
Publisher : Politeknik Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32497/eksergi.v22i01.7153

Abstract

This study investigates the effects of CaO/K₂O catalyst mass (X₁) and reaction time (X₂) on biodiesel yield produced from waste cooking oil via transesterification. A 2² factorial design was employed to evaluate the main and interaction effects of both parameters. Analysis of variance (ANOVA) confirmed that the developed regression model was statistically significant (p = 0.0253) with a high coefficient of determination (R² = 0.9386), indicating excellent model adequacy. The reaction time (X₂) exhibited the most significant positive effect on biodiesel yield (t = 5.96), while the catalyst mass (X₁) showed a negligible influence. The interaction term (X₁X₂) presented a moderate negative effect, suggesting that excessive catalyst loading combined with longer reaction duration may slightly decrease yield due to soap formation and emulsification. The contour profiler revealed that yield increases with both factors up to an optimum point, after which further catalyst addition provides minimal improvement. The optimum conditions were achieved at a catalyst mass of 4.5 g and a reaction time of 4.5 h, resulting in a biodiesel yield of 70.3%. These findings confirm that reaction time is the dominant factor affecting transesterification efficiency, and that CaO/K₂O derived from waste eggshells serves as an effective and sustainable heterogeneous catalyst.
Co-Authors Abd. Rasyid Syamsuri Abda Abda Agung Prabowo Ahmad Fadli Alvyano Andri Kurniawan Gading Bagus Mahardika Heni Sugesti Julia Rahmatina Karina Nur Eka Putri Marlinda Muh Irwan Mustafa Mustafa Nur Afni Muslimin