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All Journal Jurnal Sains Materi Indonesia Jurnal Neutrino : jurnal fisika dan aplikasinya Konversi Jurnal Teknik Jurnal Daur Lingkungan ASEAN Journal of Chemical Engineering Kinetika Yumary: Jurnal Pengabdian kepada Masyarakat Jurnal Energi Baru dan Terbarukan AJARCDE (Asian Journal of Applied Research for Community Development and Empowerment) Chemical Engineering Journal Storage (CEJS) Serambi Engineering Jurnal Pengabdian Kepada Masyarakat
Robert Junaidi
Politeknik Negeri Sriwijaya
Agriculture, Biological Sciences & Forestry Arts Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Physics Social Sciences Other

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Making methane gas from CO2 using Ni/Al2O3 catalyst in a fixed bed reactor Yuliani, Tasya Dwi; Junaidi, Robert; Meidinariasty, Anerasari
Konversi Vol 12, No 2 (2023): OKTOBER 2023
Publisher : Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20527/k.v12i2.17111

Abstract

CO2 emissions are one component of greenhouse gases, it is estimated that around 18.35 billion tons of CO2 are released every year (Sulistyono, 2012). This is because the world economy is recovering from the Covid-19 crisis by relying on coal. Based on IEA data, CO₂ emissions from energy combustion and industrial processes accounted for almost 89% of the energy sector's greenhouse gas emissions in 2021, while CO2 emissions from gas combustion contributed 0.7%. One way to reduce CO₂ in the atmosphere is by converting CO2 and using it into chemicals, for example hydrogenating CO2 into methane. The aim of this research is to create a fixed bed reactor for CO₂ methanation so as to reduce carbon dioxide pollution, while the research will use a Ni catalyst with alumina support (AL2O3)2. In this research, CO₂ was used as a raw material with a Ni/Al2O3 catalyst. Methane gas produced from carbon dioxide using a fixed bed reactor is a little at 1.34% Vol with a flow rate of 0.3 L/m and a concentration of 1 M to 9.25% Vol with a flow rate of 0.1 L/m and a concentration of 3 M for 60 minutes at a temperature of 55°????.
Physical Properties Investigations of Natural Rubber Composites Using Cetyltrimethylammonium Bromide (CTAB) as Modifier of Local Clay Filler Hasan, Abu; Junaidi, Robert; Yerizam, Muhammad; Arifin, Fatahul
ASEAN Journal of Chemical Engineering Vol 23, No 3 (2023)
Publisher : Department of Chemical Engineering, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ajche.80712

Abstract

Improved absorption of rubber backbone on filler surfaces is necessary to enhance the physical properties of rubber vulcanizate. One of the ways to repair the surface of the filler is through modifying using surfactant. Hence, this study aims to compare the physical properties of natural rubber vulcanizates using clay filler and modified clay with cetyltrimethylammonium bromide (CTAB). The processes that were followed to achieve the objectives of this research were the design of rubber formulas, mastication and milling of rubber, and testing of the physical properties of rubber vulcanization. The clay characterization and its modification using FTIR and XRD were also carried out. Characterization using FTIR and XRD showed that there was indeed a clay modification with CTAB. Natural rubber compounds were also analyzed using SEM. The torque on the rheometer for modified clay with CTAB is 12.34 kg-cm higher than for original clay, which is 7.05 kg-cm. Elongation at break and tensile strength for vulcanizate using CTAB-modified clay filler is lower than that using original clay, with 300% modulus and hardness increase. Thus, clay modification using CTAB as a filler has a good effect on the curing characteristics and physical properties of natural rubber vulcanization compared to only using local clay as a filler.
PEMBUATAN BIO PELUMAS DARI OLEIN DENGAN REAKSI PEMBENTUKAN TRI ESTER MENGGUNAKAN KATALIS ASAM SULFAT: PRODUCTION OF BIO LUBRICANTS FROM OLEIN WITH TRI ESTER FORMATION REACTION USING SULFURIC ACID CATALYST aulia, Risa; Junaidi, Robert; Hilwatullisan
JURNAL TEKNIK Vol. 17 No. 2 (2023): Edisi Oktober 2023
Publisher : JURNAL TEKNIK UNILAK

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31849/teknik.v17i2.15552

Abstract

Dalam hal pencemaran terus meningkat karena beberapa faktor yaitu meningkatnya penggunaan pelumas yang mengakibatkan pencemaran lingkungan akibat pembuangan setelah digunakan. Limbah pelumas tergolong non-degradable dan adanya limbah beracun yang tidak dimanfaatkan setelah penggunaan pelumas sehingga meningkatkan penumpukan limbah dan mencemari tanah, air dan udara. Untuk mengatasi masalah ini, dibutuhkan penggantian lubricants non degradable dengan lubricants organik. Maksud dari riset ini adalah untuk mendapatkan bio lubricant yang sebanding dengan syarat SNI 7069.2:2012. Metode pembentukan FAME dengan olein menggunakan katalis NaOH dan metanol, pembentukan di-ester dengan katalis C2H6O2 dan kalium oksida, dan melengkung tri-ester ditambah C12H24O2 dan Asam sulfat. Dalam proporsi yang berbeda, perbandingan C12H24O2: EGDE adalah 1:1, 1:2, 1:3, katalis 1%, 1,5%, 2%, suhu reaksi 100°C dan waktu reaksi adalah 40, 50, 60, 70 menit. Hasil dari penelitian ini dimana berhasil mendapatkan densitas range 0.9 – 0.942 gr/cm3, viskositas 8.14 – 9.58 mm2/s, pour point 1 – 6.5 0C dan untuk analisa alat GC – MS didapatkan senyawa yang memiliki kandungan tri – ester dengan nilai kandungan 23.5.
Pembuatan Gas Hidrogen dari Silika Hasil Ekstraksi Bottom Ash Batubara dan Serbuk Alumunium Limbah Kaleng Minuman Setiawan, Farah Kania; Junaidi, Robert; Ekawati, Linda
Jurnal Energi Baru dan Terbarukan Vol 5, No 3 (2024): Oktober 2024
Publisher : Program Studi Magister Energi, Sekolah Pascasarjana, Universitas Diponegoro, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jebt.2024.24342

Abstract

Alternatif bioenergi yang dapat digunakan salah satunya hidrogen. Hidrogen memiliki tingkat energi H2 286 kJ/mol merupakan sumber bahan baku yang melimpah dan juga bermanfaat bagi lingkungan. Hidrogen bisa dibuat menggunakan teknik menjadi biomassa, air, dan bahan bakar fosil. Dalam pembuatan hidrogen diperlukan silika, Bottom Ash mengandung senyawa silicate glass yang mengandung silika (34,29%). Tujuan dari penelitian ini menentukan morfologi silika yang terbentuk dari hasil ekstraksi, menganalisa pengaruh variasi massa silika dan alumunium dalam pembuatan hidrogen, menentukan konsentrasi optimum NaOH sebagai katalis untuk mengkonversi hidrogen, dan meningkatkan % Yield gas hidrogendengan cara menaikan variasi berat silika dan alumuium dan konsentrasi katalis NaOH. Pada penelitian ini juga ditambahkan alumunium dari limbah kaleng minuman dengan perbandingan silika dan alumunium 1:1, produksi gas hidrogen dilakukan dengan memvariasikan berat total dari alumunium dan silika sebesar 2,3,4,5 dan 6 gram, kemudian divariasikan konsentrasi NaOH 3,5 M dan 4 M. Pembuatan silika dilakukan dengan mengekstraksi Bottom Ash menggunakan NaOH dan dinetralkan menggunakan HCl. Jenis silika yang terbentuk dari hasil ekstrasi adalah jenis silika amorf.  Kemudian silika dan alumunium ditambahkan ke dalam fix bed reactor. Hasil terbaik pada pembuatan hidrogen dengan silika dan alumunium ini  berada pada berat sampel 6 gram dan konsenntrasi NaOH 4 M sebesar 41% dengan yield  10,06%.
The ability of the Ni/Al2O3 catalyst in the CO2 methanation process in terms of variations in CO2 flow rate and catalyst Parega, Sultan; Junaidi, Robert; Nugroho, Didiek Hari; Niawanti, Helda
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.v13i2.20235

Abstract

Carbon dioxide (CO2) is one of the biggest contributors to the greenhouse effect. Based on International Energy Agency (IEA) data, global emissions of carbon dioxide (CO2) from burning energy and industrial activities will reach 36.8 billion tons in 2022. The increase in emissions in 2022 will mainly come from burning coal and fuel oil (Fuel Oil). Carbon dioxide emissions from coal rose 1.6% while fuel oil emissions increased 2.5%. One effort to reduce carbon dioxide emissions is to convert carbon dioxide into methane gas (CH4) which can be used as fuel. This research aims to produce methane gas from carbon dioxide using Ni/Al2O3 catalyst treatment and varying CO2 flow rates. In this research, CO2 was used as a raw material with a Ni/Al2O3 catalyst and Zn metal. Based on the research results, the highest conversion yield of methane gas was 49.23% with a variation of 0.05 L/minute with Ni_R4 catalyst treatment
Regeneration of Ni/Al2O3 catalyst in CO2 methanation Melati, Rima; Junaidi, Robert; Zamhari, Mustain
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.v13i2.19951

Abstract

CO₂ emissions are one form of greenhouse gas (GHG) emissions that contribute to global warming. CO₂ contributed 175.62 million tons in 2021, impacting greenhouse gas levels. One strategy to reduce the concentration of CO₂ in the atmosphere is to convert CO₂ gas into useful chemicals. One example of this is the hydrogenation of CO₂ to produce methane, which can serve as an alternative to LPG. The aim of this research is to produce methane gas by developing a fixed bed reactor in a simple manner. The catalyst Ni/Al2O3 with 20 grams and five regenerations could produce CH₄ up to 49.73% compared to 39.06% for those with 10 grams. However, the H2 gas remaining is higher for those with 10 grams (1.454 ppm compared to 1.042 ppm). Also, The CO2 gas remaining is higher for those with 10 grams (58.18% compared to 47.92%). The results of this study can be the basis for developing energy policies, encouraging investment in clean energy technologies, and supporting the reduction of greenhouse gas emissions for energy sustainability and resilience.
Konversi CO2 Menjadi Metana Menggunakan Katalis Ni-Zn/Al2O3 Ditinjau dari Kemampuan Katalis dan Waktu Operasi Wijaya, Satria Agung; Junaidi, Robert; Hasan, Abu
Jurnal Serambi Engineering Vol. 10 No. 2 (2025): April 2025
Publisher : Faculty of Engineering, Universitas Serambi Mekkah

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

Abstract

Carbon dioxide (CO2) gas is a gas that can be a threat to the environment because its emissions continue to increase from year to year. Therefore, this research aims to utilize CO2 gas and convert it to methane gas (CH4) using a fixed bed reactor type reactor containing a catalyst. In this study, the CO2 methanation process was carried out with the help of Ni/Al2O3 catalyst supported with Zn metal in situ. This study varies the catalyst treatment denoted by Ni_R0 - Ni_R4, with the amount of catalyst as much as 50 grams and variations in the operating time of the CO2 methanation process for 70 minutes and 80 minutes. The highest methane gas yield of 50.11% was obtained in sample 10 with the Ni_R4 catalyst treatment variation (Ni_R0 - Ni_R4 variation) for 80 minutes (70 minutes and 80 minutes variation). The longer the methanation process, the longer the contact process between CO2 gas and NaOH solution.
Sosialisasi Pengolahan Air Sumur Bor Menjadi Bersih dengan Tray Aerator Ventury Yerizam, Muhammad; Junaidi, Robert; Manggala, Agus; Riansyah, Epan; Tamara, Ade; Khairunnisa, Annisa Septia
Yumary: Jurnal Pengabdian kepada Masyarakat Vol. 5 No. 4 (2025): Juni
Publisher : Penerbit Goodwood

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35912/yumary.v5i4.3651

Abstract

Purpose: This study aimed to socialize the method of processing drilled well water into clean water that is suitable for use as boiler feed water, with a focus on the use of Tray Aerator Venturi tools to improve water quality. Methodology: The method applied was socialization and application of the Tray Aerator Venturi tool using 3D visualization, which was carried out directly at PT Utama Karya Techindo. The activity begins with a site survey, followed by discussions with company management to identify problems. Results: The results of this activity showed an increase in the understanding of PT Utama Karya Techindo staff regarding the water treatment process. The use of the Tray Aerator Venturi is effective in reducing the levels of iron (Fe) and manganese (Mn) in well water, which were previously the main causes of corrosion in boiler pipes. Conclusions: Using the Tray Aerator Venturi is effective and economical for processing well water into quality boiler feed water. Apart from improving water quality, this technology also reduces the risk of corrosion in pipes. This activity succeeded in providing understanding and skills to partners to operate and maintain the water treatment systems independently. Limitations: The lack of money available to manufacture Venture Tray Aerator tools to be implemented directly in companies to be more effective in outreach. Contribution: The outreach can be used for PT Utama Karya Techindo's needs in managing boiler feed water in Tanjung Enim. This service can be used for household needs in managing clean water because the equipment is easy to make and affordable.
Proses Transesterifikasi Biodiesel Dari Minyak Jelantah Menggunakan Katalis CaO Cangkang Kerang Diimpregnasi Dengan NaOH Jannah, Miftahul; Meidinariasty, Anerasari; Junaidi, Robert
Jurnal Daur Lingkungan Vol 8, No 2 (2025): Agustus
Publisher : Universitas Batanghari Jambi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.33087/daurling.v8i2.371

Abstract

The development of biodiesel in Indonesia began in 2006, and by 2023 it had reached the B35 blend, aiming to reduce carbon emissions and enhance energy security. This study utilizes used cooking oil as a feedstock for biodiesel and blood cockle shells as the catalyst source, with the goal of reducing household waste. The objective of this research is to investigate the effect of catalyst concentration from blood cockle shells impregnated with NaOH on the yield and quality of biodiesel. The research method began with the preparation of CaO catalyst through NaOH impregnation, characterized using XRF, and then applied in the transesterification process using a Simple Stirred Tank Batch Reactor with variations in catalyst concentration (3%, 3.5%, 4%, 4.5%, and 5%) and temperature (50°C and 60°C). XRF characterization results showed an increase in CaO content from 79.0910% before to 89.2466% after impregnation. Based on the analysis data, the best conditions were achieved at 5% catalyst concentration and 60°C, resulting in a yield of 83.6%, with a density of 0.8700 g/mL, a viscosity of 4.6523 mm²/s, a flash point of 151°C, and a cetane number of 73.4 — all of which meet the SNI 7182-2015 standard. The methyl ester content analyzed using GC-MS on the optimum sample showed that the dominant compounds was methyl palmitate with a total area of 42.84% and methyl oleate with 37.09%. Keywords :    Biodiesel, CaO Catalyst, Transesterification, Used Cooking OilABSTRAKPengembangan biodiesel di Indonesia mulai sejak 2006 dan pada tahun 2023 sudah mencapai campuran B35, bertujuan untuk mengurangi emisi karbon dan meningkatkan ketahanan energi. Penelitian ini memanfaatkan minyak jelantah sebagai bahan baku biodiesel dan cangkang kerang sebagai sumber katalis; bertujuan untuk mengurangi limbah rumah tangga. Pada penelitian ini bertujuan untuk mengetahui pengaruh konsentrasi katalis cangkang kerang yang diimpregnasi dengan NaOH terhadap hasil dan mutu biodiesel. Metode penelitian ini diawali dengan preparasi katalis CaO dengan impregnasi NaOH, di karakterisasi menggunakan XRF, kemudian digunakan dalam proses transesterifikasi menggunakan alat Reaktor Batch Tangki Berpengaduk Sederhana dengan variasi konsentrasi katalis (3%; 3,5%; 4%; 4,5%; dan 5%) dan variasi suhu (50°C dan 60°C). Hasil karakterisasi dengan XRF, menunjukkan peningkatan kandungan CaO sebelum sebesar 79,0910% dan CaO setelah impregnasi sebesar 89,2466%. Berdasarkan data analisis, kondisi terbaik diperoleh pada konsentrasi katalis 5% dan suhu 60°C dengan yield sebesar 83,6%, dengan nilai densitas sebesar 0,8700 g/mL, nilai viskositasnya 4,6523 mm²/s, titik nyala 151°C, dan cetane number mencapai 73,4, yang semuanya memenuhi SNI 7182-2015. Kandungan metil ester yang di analisis menggunakan alat GC-MS yaitu pada sampel optimum, menunjukkan bahwa senyawa dominan berupa methyl palmitate dengan total area sebesar 42,84% dan methyl oleate sebesar 37,09%. Kata kunci : Biodiesel, Katalis CaO, Minyak Jelantah, Transesterifikasi
Pemanfaatan Pewarna Alamiah Bunga Telang (Clitoria ternatea) Sebagai Antioksidan pada Makanan Sofiah, Sofiah; Yerizam, M.; Junaidi, Robert
Jurnal Pengabdian Kepada Masyarakat Vol. 1 No. 5 (2025): Jurnal Pengabdian Kepada Masyarakat
Publisher : CV. Era Digital Nusantara

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59066/jpkm.v1i5.1558

Abstract

Tanaman bunga telang (Clitoria Ternatea) merupakan salah satu daritanaman yang semua bagiannya memiliki manfaat fungsional bagi tubuh manusia. Bagian kelopak bunganya dilaporkan bermanfaat sebagai antioksi dan, anti diabetes, anti obesitas, anti kanker, anti inflamasi, anti biotik dan melindungi jaringan hati. Salah satu pigmen alami yang berpotensi untuk digunakan sebagai pewarna alami Adalah antosianin. Bunga telang (Clitoria ternatea) merupakan salah satu sumber pigmen biru atau antosianin. Salah satu cara agar bunga telang dapat dikonsumsi oleh masyarakat dengan memanfaatkan potensi pigmen alamidari ekstrak bunga telang dan beberapa kandungan di dalamnya dapat dilakukan dengan mengaplikasikannya menjadi pewarna alami untuk makanan. Ini merupakan salah satu upaya yang dapat dilakukan untukmencegah semakin banyaknya penggunaan pewarna sintetis yang tidakaman yaitu menggantinya dengan pembuatan pewarna alami. Antosianin merupakan pigmen alami pemberi warna biru pada bunga telang (ClitoriaTernatea). Oleh sebab itu pengabdian ini bertujuan mengajak masyarakat khususnya Ibu-ibu guru, Siswa –siwa di SMPN 2 menggunakan pewarna alamiah dari ektrak bunga telang (Clitoria ternatea) yang aman untuk dikonsumsi oleh masyarakat berbahan baku alami dan mudah didapat serta pemngolahan pengambilan zat warnanya sangat sederhana, juga dapat menambah informasi baru dan keterampilan untuk para Guru, siswa dalam membuat makanan dengan pewarna alamiah seperti lepat singkong Agar-agar, manisan kolang-kaling.Respon umpan balik yang diberikan tim pelaksana pengabdian kepada peserta pengabdian menghasilkan respon positif terhadap kegiatan ini, yang awalnya belum mengetahui pembuatan dan penggunaan pewarna alamiah menjadi tahu akan hal tersebut
Co-Authors ., Anerasari Abu Hasan Amanah, Tria Rizki Anerasari Meidinariasty Arisqi, Muhamad Muammar Arizal Aswan Aulia, Risa Azizah, Roro Rizqi Ramadhani Didiek Hari Nugroho Ekawati, Linda Fadarina Fatahul Arifin, Fatahul Harwanda, Muhammad Sabdian HC, Fadarina Heru Santoso Hilwatullisan Indah Purnamasari Kalsum, Leila Khairunnisa, Annisa Septia Manggala, Agus Martha Aznury Miftahul Jannah Muhammad Yerizam Mustain Zamhari Niawanti, Helda Ningrum, Galuh Martiyah Oktarina, Ayu Pahlevi, Muhammad Agmerio Parega, Sultan Rachmatika, Nisa Rahmaniar Rahmaniar, Rahmaniar Ramadhani, Dea Rizki Riansyah, Epan Rima Melati Rusdianasari Rusdianasari Sardewi, Tri Sari, Della Yusfita Selastia Yuliati Setiawan, Farah Kania Sofiah Sofiah Sulistyawati, Novia Ayu Tamara, Ade Utami, Winda Andea Wijaya, Satria Agung Yerizam, M. Yuliani, Tasya Dwi Zaman, Muhammad Zulkarnain S.T.,M.T.