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INDONESIA
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan
Published by Universitas Brawijaya
ISSN : 25482300     EISSN : 25482181     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Energy Environmental Science
Jurnal Rekayasa Bahan Alam dan Energi Terbarukan merupakan jurnal elektronik yang mempublikasikan hasil penelitian, knowledge sharing dari dosen, mahasiswa maupun kalangan industri yang berfokus pada teknologi kimia pengolahan bahan alam dan energi secara berkelanjutan. Jurnal ini terbit 2 kali dalam setahun.
Arjuna Subject : -
Articles 71 Documents
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Absorption Time and Temperature Effects on The Physical Chemical Properties of Refined Used Cooking Oil Using Bentonite and Carbon Bagasse Adsorbents: Pengaruh Temperature dan Waktu Absorpsi Terhadap Properti Fisik dan Kimia dari Minyak Goreng Bekas yang Dimurnikan Menggunakan Adsorben Bentonit dan Karbon Ampas Tebu Adhiksana, Arief; Febriyana, Qobid; Wahyudi, Wahyudi; Irwan, Muhammad; Tahir, Ramli; Fitriyana, Fitriyana; Kusyanto, Kusyanto; Oko, Syarifuddin
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 1 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.01.01

Abstract

Bentonite and carbon bagasse adsorbents are used to study the effects of temperature and absorption time on the physico-chemical properties of refined used cooking oil. Any extended use of outdated cooking oil will have an impact on the body's health since it causes fat cells to accumulate in various vital organs. Used cooking oil can be cleaned by using adsorbents like bentonite, bagasse, and activated carbon. This study investigated the effects of temperature and adsorption period on the purification results of used cooking oil using activated carbon adsorbents comprised of bagasse and bentonite. In this study, a factorial group randomised design was used. First, there is a 1:1 adsorbent to substrate ratio. Secondly, there are four adsorption temperature levels: 30°C, 60°C, 90°C, and 120°C. The third factor is adsorption time, which are: 30, 60, 90, and 120 minutes. Counting the quantity of acids, peroxides, and free fatty acids was one method of data analysis. The best results are obtained when used cooking oil is refined using activated carbon, bagasse, and bentonite at 120°C for 90 minutes of adsorption. The result is an acid number of 0.913, a peroxide number of 2.532, and a free fatty acid content of 0.459%.
Study of Coal Combustion Waste Utilization: Coal Fly Ash for Adsorption of Pb(II), Cd(II), BOD and COD in Donan River Water Samples: Studi Pemanfaatan Limbah Pembakaran Batubara: Abu terbang Batubara untuk Adsorpsi Pb(II), Cd(II), BOD dan COD pada Sampel Air Sungai Donan Rohmah, Dini; Khuzaimah, Siti; Alimah, Gustin Nur
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 2 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.02.01

Abstract

The Donan River is the largest source of fresh water in Cilacap Regency. The existence of industrial areas and densely populated residential areas in river basins makes river water polluted. On the other hand, the Karangkandri PLTU industry in Cilacap has coal burning waste in the form of fly ash which can be used for heavy metal adsorption and water pollutant adsorption. The aim of this research is to determine the effectiveness of fly ash for the adsorption of metal ions Pb(II), Cd(II), BOD and COD in Donan River water. Water from the Donan River were taken at 3 points, from the three sampling points it was proven that the water quality of the River was above the class III water threshold. The next step was to tested the fly ash adsorbent which has been activated with H2SO4. The effectiveness test of the fly ash adsorbent included testing the ability to absorb Pb(II) and Cd(II) metal ions and reduce BOD and COD levels in 500ml sample water with an adsorbent mass of 100g, three of water sample as independent variable. Research showed that fly ash adsorbents were able to reduce water pollutant levels with a maximum capacity of 80%.
Effect of Adding Basil Leaf Extract (Ocimum basilicum) on Reducing Ag+ Ions to Ag0 by Colorimetry: Pengaruh Penambahan Ekstrak Daun Kemangi (Ocimum basilicum) Terhadap Reduktor Ion Ag+ menjadi Ag0 secara Kolorimetri Ambarita, Petrus Alvin Peter Ambarita; Nurhayati, Veni Putri; Rani, Fella Anindya; Putri, Tia Azzahra; Khansa, Shefia Dhiya; Gultom, Rifka; Rorensya, Chika Ari Dinar; Saputra, Iwan Syahjoko
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 2 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.02.04

Abstract

Nanotechnology has become a significant focus of research in efforts to address various challenges across multiple fields, including the synthesis of metal nanoparticles using natural bioreductors. This study explores the use of basil leaves (Ocimum basilicum) as a natural bioreductor for the synthesis of silver nanoparticles (Ag). The extract from basil leaves is rich in flavonoids, which serve as reducing agents in the green synthesis process of silver nanoparticles. The research methods include the preparation of basil leaves, extraction of simplicia, phytochemical analysis, and testing the bioreduction of Ag+ ions. The results indicate that the addition of basil leaf extract effectively reduces Ag+ ions to Ag⁰, marked by a color change in the solution to yellow-green within 60 minutes. The uniqueness of this study lies in utilizing basil leaves as an environmentally friendly bioreductor in the synthesis of silver nanoparticles. These findings have broad potential applications in catalysis, sensing technologies, and cosmetics.
Optimization of the Use of Bottom Ash PLTSa Bantargebang As an Adsorbent in the Process of Reducing FFA in Used Cooking Oil Biodiesel Raw Material with Taguchi Method: Optimasi Penggunaan Bottom Ash PLTSa Bantargebang Sebagai Adsorben pada Proses Penurunan FFA pada Minyak Jelantah Bahan Baku Biodiesel Dengan Metode Taguchi Wicaksono, Damar Canggih; Susmiati, Yuana; Prasetyo, Dafit Ari
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 2 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.02.05

Abstract

The reduction of FFA levels in used cooking oil as a biodiesel raw material is generally done by the esterification process. Another method that can be used to reduce FFA levels is through the adsorption method. The adsorbent used is bottom ash waste. This study aims to determine the effect of bottom ash adsorbent variation and determine the best variation based on Taguchi analysis. This research uses Taguchi data processing technique with 2 factors and 3 levels. The first factor is adsorbent mass with variations (5% m/v, 10% m/v, and 15% m/v). The second factor is the length of adsorption time with variations (30 minutes, 60 minutes, and 90 minutes). The testing parameters included FFA content, acid number, density, and viscosity. The results of this study were analyzed using the Taguchi method which shows the variation of adsorbent mass and time for FFA content is the variation of 5% m/v adsorbent mass and 30 minutes adsorption time which can reduce FFA by 35.2%, with an acid number value of 3.029 mg KOH/g, density of 0.903 g/cm3 and viscosity of 4.463 sCt in samples that successfully reduced the FFA value by 35.2%.
Effect of Mass Variation of Pepper Leaves on Essential Oil Extraction Via Microwave Assisted Extraction (MAE): Pengaruh Variasi Massa Daun Lada Pada Proses Ekstraksi Minyak Atsiri Via Microwave-Assisted Extraction (MAE) Hamzah Fansuri; Adhiksana, Arief
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 2 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.02.06

Abstract

Microwave-Assisted Extraction (MAE) is one of the modern technologies that offer advantages in terms of time and efficiency compared to conventional methods. However, few studies still examine the effect of mass variation on the yield of essential oil produced through the MAE method. This study aims to evaluate the effect of variation in the mass of pepper leaves on the yield of essential oil obtained by the MAE method. This study also aims to determine the optimum mass that gives the highest yield. The extraction was carried out at a microwave power of 600 Watts, a temperature of 105 ºC for 2 hours, using water as a solvent for various pepper leaf masses. The effect of material mass variation on essential oil yield was analyzed and compared. The results showed that the essential oils obtained had a specific gravity of 0.8717, a refractive index of 1.485 Brix, and an acid number of 0.9211 mg/g, respectively. Furthermore, the results also obtained the optimum mass of pepper leaf material at 300 grams with a yield of 0.27%. We believe this study can be a reference for selecting the best mass of material from pepper leaves for essential oil production for further research.
Alkaline Treatment effect on Teak Sawdust Aerogel in Waste Cooking Oil Adsorption: Pengaruh Perlakuan Basa Terhadap Aerogel Serbuk Kayu Jati Pada Adsorpsi Minyak Jelantah Halawa, Arif Srimudaris; Salsabina, Syifa; Harfilani, Rialfi Putri Nur; Rizqita, Indy Inasa; Alghifari, Abudzar; Mitan, Nona Merry M.
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 2 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.02.02

Abstract

Waste cooking oil is household waste that can pollute the environment and damage aquatic ecosystems if not properly treated. In Indonesia, its production reaches 6.46–9.72 million kiloliters per year. To address this issue, effective adsorbent materials such as cellulose aerogels are needed. This study utilizes teak sawdust waste as a cellulose source for aerogel production. The delignification process using NaOH yields cellulose pulp, which is then converted into cellulose aerogel. This cellulose aerogel was tested for its adsorptivity towards waste cooking oil, showing the highest absorption capacity at 100°C delignification variation, amounting to 0.27 grams of waste cooking oil per gram of cellulose aerogel with 76.15% of the waste cooking oil adsorbed. TGA analysis confirmed that the aerogel has higher thermal stability compared to the original teak sawdust waste, and SEM analysis revealed the porous structure of the aerogel supporting its adsorptive capacity. The results show that cellulose aerogel from teak sawdust waste is effective in absorbing waste cooking oil and has great potential as an environmentally friendly solution for water pollution, supporting Sustainable Development Goals (SDGs) Number 6 on clean water and sanitation.
Extraction of Essential Oil from Cloves (Syzygium aromaticum) Using Ultrasound Microwave Assisted Extraction Method: Ekstraksi Minyak Atsiri dari Cengkeh (Syzygium aromaticum) Menggunakan Metode Ekstraksi Berbantuan Gelombang Mikro Ultrasonik Dwi Nur Arinal Khaq; Annisa Rachma Meydyanti; Erliyanti, Nove Kartika
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 8 No. 2 (2024)
Publisher : Fakultas Teknik, Universitas Brawijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21776/ub.rbaet.2024.008.02.03

Abstract

Ultrasound Microwave Assisted Extraction (UMAE) is an alternative to extracting clove essential oil by combining ultrasonic waves and microwaves to improve the efficiency and effectiveness of extraction. The purpose of this study is to examine the effect of microwave power and extraction time on the yield and density of clove essential oil. The cloves are reduced to a size of ± 0.5 cm and then dried using an oven for 60 minutes at a temperature of 70 °C. The pre-treatment process is carried out for 5 minutes with a temperature of 40 °C assisted by ultrasonic waves. After the pre-treatment process, the results obtained were then further extracted with microwave assistance with variable extraction times of 30, 40, 50, 60, and 70 minutes and microwave power of 150, 300, 450, and 600 Watts. The results showed that the addition of microwave power and extraction time had a significant influence on the yield value and density of clove essential oil. The best results of clove essential oil extraction using the Ultrasound Microwave Assisted Extraction method were obtained at 600-watt microwave power and at 70 minutes of extraction time with a yield value of 10.63% and a density of 1.0515 gr/ml.
Pemanfaatan Kulit Bawang Merah dan Daun Belimbing Wuluh sebagai Green Corrosion Inhibitor pada Baja Karbon Ramadhana, Rucita; Suharti, Profiyanti Hermien
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 9 No. 1 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

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Abstract

Korosi merupakan salah satu fenomena penurunan kualitas baja secara bertahap karena adanya reaksi dengan lingkungan. Hal ini dapat berakibat fatal karena dapat mengurangi umur serta kekuatan dari suatu bangunan konstruksi. Carbon steel merupakan material pada rangka konstruksi yang sering digunakan namun memiliki kelemahan mudah terkorosi. Pemanfaatan inhibitor merupakan salah satu cara yang paling efektif untuk mengendalikan laju korosi. Salah satu senyawa yang dapat digunakan untuk menurunkan laju korosi adalah flavonoid dan tanin yang dapat diperoleh dari kulit bawang merah (KBM) dan daun belimbing wuluh (DBW). Pemanfaatan KBM dan DBW sebagai inhibitor alami atau Green Corrosion Inhibitor masih jarang dilakukan pada reaksi korosi Carbon Steel. Pada studi ini menggunakan metode ekstraksi maserasi dengan menggunakan pelarut etanol 70% untuk mendapatkan ekstrak dari serbuk KBM dan DBW serta metode selisih penurunan berat untuk mengetahui laju korosi pada pelat baja karbon. Variasi fraksi massa serbuk KBM dan DBW masing-masing adalah 1,24%; 2,48%; dan 3,72% (w/w). Sampel baja karbon direndam selama 72 jam dan kemudian dilakukan uji korosi dengan mengalirkan air laut selama 30 hari pada sampel. Hasil pengujian menunjukkan ekstrak KBM dan DBW dapat memperlambat laju korosi sehingga berpotensi untuk dimanfaatkan sebagai Green Corrosion Inhibitor.
Pembuatan Briket Tempurung Kelapa Sesuai SNI Dengan Penambahan KNO3 Larassati, Inggar Tri; Putri, Rossy Ayuanita; Poerwadi, Bambang; Kartikowati, Christina Wahyu
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 9 No. 1 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

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Abstract

Briket sering digunakan bahan bakar, standar kualitasnya menggunakan SNI 01-6235-2000 berupa persyaratan mutu kadar air, kadar abu, nilai kalori dan volatile matter. Briket tempurung kelapa komersial memiliki kelemahan waktu nyala api yang lama 15 menit ketika dinyalakan pertama kali. Penyalaan yang lama ini tidak efisien ketika briket digunakan, penambahan oksidator dapat mempercepat nyala api. Maka dari itu, tujuan penelitian ini untuk mempercepat nyala briket serta mengetahui pengaruh penambahan KNO3 dalam bentuk lapisan terhadap kualitas briket sesuai dengan SNI. Jumlah oksidator KNO3 yang digunakan adalah 0,5%- 2% terhadap total arang. KNO3 yang telah tercampur arang diaplikasikan dalam lapisan dengan persentase 5%, 10% dan 15% terhadap total arang setiap briket. Berdasarkan hasil yang didapatkan, dengan penambahan KNO3 pada briket dapat mempercepat waktu nyala dengan waktu tercepat sebesar 31 detik pada briket dengan KNO3 sebesar 2% serta lapisan sebesar 5% dan mempercepat laju pembakaran briket dengan laju pembakaran tercepat 0,120 gram/menit pada briket dengan KNO3 sebesar 2% serta lapisan 15%. Kadar abu briket mengalami peningkatan dengan kadar abu tertinggi sebesar 6,88% pada briket dengan KNO3 sebesar 2% dan nilai kalori mengalami penurunan dengan nilai kalor tertinggi 7214,75kal/gr pada briket dengan KNO3 2%. Penambahan KNO3 pada briket tidak mempengaruhi nilai kadar air.
Perancangan Sistem Hibrid Berbasis Panel Surya dan LPG Sebagai Energi Alternatif Terbarukan Pratama, Defrianto; Hadiningrum, Kunlestiowati; Muldiani, Ratu Fenny
Jurnal Rekayasa Bahan Alam dan Energi Berkelanjutan Vol. 9 No. 1 (2025)
Publisher : Fakultas Teknik, Universitas Brawijaya

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Abstract

A Hybrid System Based on Solar Panels and LPG offers an alternative energy solution that combines renewable solar energy with LPG for improved efficiency and reliability. Solar panels capture sunlight and convert it into electricity, which can be used immediately or stored in batteries for later use, such as at night or during cloudy weather. Solar energy is eco-friendly, renewable, and widely available. However, when solar energy is insufficient, LPG is used as a backup fuel for a generator to ensure continuous power supply. Although not renewable, LPG is cleaner than other fossil fuels like coal or oil. The hybrid system's advantage lies in its efficiency, as solar panels reduce LPG consumption, while LPG ensures uninterrupted power. This combination makes the system more reliable by providing energy even when one source is unavailable. Despite the use of LPG, this system is more environmentally friendly than relying solely on fossil fuels, as it reduces the overall need for LPG. Keywords: Solar Cells, LPG, Hybrid

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