A5054600745- Graphene research and applications
- Advancements in Battery Materials
- Supercapacitor Materials and Fabrication
- Biodiesel Production and Applications
- Advanced Battery Technologies Research
- Heavy Metal Pollution Remediation
- Geotechnical and construction materials studies
- Catalysis and Hydrodesulfurization Studies
- Educational Methods and Outcomes
- Geological Modeling and Analysis
- Geological and Geophysical Studies
- Graphene and Nanomaterials Applications
- Education and Character Development
- Thermochemical Biomass Conversion Processes
- Edible Oils Quality and Analysis
- Surface Treatment and Residual Stress
- Corrosion Behavior and Inhibition
- Metal and Thin Film Mechanics
- Magnesium Oxide Properties and Applications
- Fiber-reinforced polymer composites
- Marine and Coastal Ecosystems
- Coastal Management and Development
- Surface Treatment and Coatings
- Advanced Battery Materials and Technologies
- Extraction and Separation Processes
State University of Medan
2017-2024
Mediterranean Universities Union
2020
University of North Sumatra
2018-2019
Financial Management Association International
2017
Bio-oil from biomass pyrolysis is promising to be used as a sustainable biofuel and high-value-added chemical. However, the presence of high acid, water, oxygenate causes corrosive properties, low higher heating value (HHV), instability bio-oil component. Therefore, refining essential improve its quality. In this study, we introduced natural zeolite (HZ) impregnated with transition metal oxide (TMO) refine using hydrodeoxygenation method (HDO) at various catalyst ratios temperatures. We find...
AbstrakPelabuhan Kalabahi-Alor di lahan milik PT (persero) pelabuhan Indonesia III Cabang Kupang, dengan luas daerah daratan 71.131 m2 dan lingkungan kerja perairan 1.880 Ha. Sedangkan kepentingan adalah 1.813 Dengan ukuran 4 x 5 meter untuk dermaga I 115 10 II. Wilayah monitoring termasuk dalam wilayah Kelurahan Teluk Mutiara, Kecamatan Kabupaten Alor Provinsi NTT. Kegiatan ini dilakukan analisis kualitas laut lingkunganpelabuhan umum Kalabahi-Alor.Kualitas air meliputi kimia-fisika...
Graphene was synthesized through a two-step pyrolysis method using waste candlenut (Aleurites moluccanus) shells as the precursor. Cerium (Ce)/graphene composites were prepared via an impregnation technique. The resulting graphene and Ce/graphene characterized various analytical methods, including Scanning Electron Microscopy with Energy-Dispersive Spectroscopy (SEM-EDS), X-ray Diffraction (XRD), Photoelectron (XPS), Transmission (TEM), Thermo Gravimetric Analysis (TGA), Fourier Transform...
In this article, we present the performance of Copper (Cu)/Graphene Nano Sheets (GNS) and C-π (Graphite, GNS, Nitrogen-doped Graphene (N-GNS)) as a new battery electrode prototype. The objectives research are to develop number prototypes electrode, namely Cu/GNS//Electrolyte//C-π, evaluate their respective performances. N-GNS, primary (Cu/GNS/Electrolyte/C-π) were synthesized by using modified Hummers method; N-doped sheet was obtained doping nitrogen at room temperature impregnation or...
Graphene was synthesized through a two-step pyrolysis method using waste candlenut (Aleurites moluccanus) shells as the precursor. Cerium (Ce)/graphene composites were prepared via an impregnation technique. The resulting graphene and Ce/graphene characterized various analytical methods, including Scanning Electron Microscopy with Energy-Dispersive Spectroscopy (SEM-EDS), X-ray Diffraction (XRD), Photoelectron (XPS), Transmission (TEM), Thermo Gravimetric Analysis (TGA), Fourier Transform...
Synthesis of silica gel with sol-gel method has been carried out by utilizing the volcanic ash from Mount Sinabung taken Berastepu village, Simpang Empat, Karo within 1.5 km summit Sinabung. Volcanic is one largest source silica, potentially as materials for gel. in this study conducted method. didekstruksi 4M NaOH solution and formation 3M HCl solution. Characterization performed AAS analysis, FTIR XRD. Silica levels obtained amounted to 17.85%. Based on results using analysis showed a...
This study investigated the potential of porous silica material extracted from volcanic ash Mount Sinabung, Indonesia, as a corrosion inhibitor. The new was subjected to comprehensive analysis using X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Search Engine Marketing (SEM), and Atomic Absorption Spectrophotometry (AAS). Corrosion test conducted by coating metal surface with synthesized silica. XRD data showed presence amorphous silica, while SEM indicated rough...
Synthesis of silica gel base on Mount Sinabung's volcanic ash taken from different villages, was carried out.The purposes this research are to synthesis and characterized by which generated ash.The method is a sol-gel method.T h e w as Fourier Transform Infra Red (FTIR), X-Ray Diffraction (XRD), Barret Emmet Teller (BET) respectively.The consists Si-O-Si Si-OH groups.XRD data also shows that amorphous.BET show the surface area 374.994m²/g.A fix bed Column used for removal Cd(II).The...
The effect of particle sizes Mg on Magnesium-Graphene nano sheets (Mg-GNS (C-π)) interaction when used as an anode primary battery was evaluated. GNS synthesized using the modified Hummers method, while Mg/GNS composite with 10–40% prepared by a facile impregnation method. XRD data shows peaks C(002) and Mg(102) at 2θ = 26.77° 44.69°, respectively, indicating metals were successfully introduced onto surfaces. These are consistent EDX spectrum which C (0.277 keV) (1.253 keV). 10%/GNS (3.871...
Oil fuels derived from fossils are non-renewable, so over time, they will run out and have a negative impact on air pollution. To overcome this, there is need for environmentally friendly alternative renewable sources such as biodiesel. This research used microwave heating with CaO catalyst. NaOH-impregnated snail shells active carbon support. aims to determine the effect of power conversion candlenut seed oil into biodiesel using NaOH/CaO/CA catalyst both in terms compliance SNI 7182-2015...
Abstract AISI 316LN is widely used in biomedical applications, specifically bone implant materials because it easier to fabricate than titanium alloys and cobalt has a cheap price. lower hardness alloy coblate alloy, which causes many material failures. Diamond-like Carbon surface treatment that may enhance material’s mechanical qualities resistance corrosion. Because electroplating creates coating on the surface, can corrosion resistance. The process carried out with duration of 1.4 mbar...
This research aims to measure the superhydrophobic performance of silica and effect sonification (ultrasonically dip coating) on effectiveness coatings iron metal in corrosive solutions 15% HCl (v/v) 3.5% NaCl (w/v). utilizes ultrasonic waves disperse paint into a homogeneous mixture applies this as protective coating material surface with help aim increasing its ability inhibit corrosion. The main used is Sinabung volcanic ash-based which was synthesized using sol-gel method. addition...
Graphene is a 2-dimensional carbon allotrope consisting of thin layer sp2 atoms connected by van der Waals forces. Doping metal and/or the addition electrolyte to graphene structure can improve graphene’s conductivity properties. More details be found in article number 2100453, Rikson Siburian and co-workers.
The quality of an education always refers to the results or academic achievements achieved by students. Chemistry can be a place means for students practice critical thinking skills, creative and able solve problems where relate them everyday phenomena. Certainly, there are many factors that influence success in learning chemistry. This study aims determine relationship between self-efficacy skills with student chemistry outcomes. sample this was 50 class XI taken random sampling technique....
HOTS is a lesson designed to prepare the 21st century generation. Each student's ability certainly different, and this influenced by many factors. This study aims determine relationship between learning motivation, self-confidence initial with students' abilities. The sample of was 32 students class XI MIPA 2 taken random sampling technique. Data analysis used multiple linear simple regression test. results showed that (1) there positive significant motivation abilities, (2) abilities; (3)...
Pengaruh metode perendaman dan refluks menggunakan asam klorida untuk meningkatkan kadar silika abu vulkanik gunung Sinabung telah dilakukan. Dalam perlakuannya yang dipreparasi dengan ukuran 100 mesh diuji awalnya instrumen XRF. Selanjutnya ditambah HCl 12 M dipanaskan pada suhu o C selama 2 jam perbandingan yaitu 1:10 (w/v) kedua tersebut. Setelah itu didestruksi NaOH 4 filtrat dihasilkan ditetesi 3 sampai terbentuk gel kemudian diuji. Karakteristik analisa produk FTIR, XRD SEM-EDS....
The effect of various types mineral acids in activating the silica volcanic ash Mount Sinabung has been carried out. use is aimed at reducing impurities form metals contained so that it can increase SiO2 content ash. In treatment, prepared beforehand by grinding and sieving with a 200 mesh sieve. sieved was then added acids, namely HCl, HNO3 concentrated H2SO4 heated 100oC for 2 hours. After that, neutralized distilled water an oven 120oC 6 hours characterized using XRF to determine had...
Herein, the effect of size Mg clusters on graphene nano sheets (GNS) and N‐GNS (C‐ π ) is investigated. The dependence electric conductivities C‐ electrolytes was also explored. This work aims to clarify Mg/C‐ study addition materials their electrical chemical interaction between GNS N‐GNS, respectively. are synthesized by modified Hummers N‐dopant method at room temperature, Characterization each material carried out using X‐ray diffraction (XRD), scanning electron microscope–energy...
Abstrak Telah dilakukan Fabrikasi pengaruh komposisi alumina untuk pembuatan keramik porselin sebagai bahan isolator listrik. Bahan baku yang digunakan adalah campuran dari Kaolin , Kuarsa Feldsfar dan Alumina (Produk Jerman, 99%), dimana divariasikan yaitu 0%, 5%, 10%, 15% 20% berat total seluruh bahan. Suhu pembakaran 1100oC, 1200oC, 1300oC, 1400oC 1500oC, pada masing-masing suhu ditahan selama 2 jam. Berdasarkan pengujian densitas, porositas, termal ekspansi, terlihat bahwa persentase...
Adsorpsi logam berat Pb (II) oleh adsorben berbasis silika dari abu vulkanik gunung Sinabung dengan sistem batch meliputi: jumlah adsorben, waktu kontak, pH dan konsentrasi telah dilakukan.hasil menunjukakan bahwa massa optimum diperoleh 0,25 g yang teradsorpsi 9,8801x10-6 mol / g. Waktu kontak 40 menit 9.9091x10-6 adsorpsi adalah 7 9,5845x10-6 Konsentrasi optimumnya 110 ppm 2.3103x10-5 Kata kunci: Silika gel, adsorpsi, batch, Ion
Volcanic ash from Mount Sinabung has a large silica (SiO2) content of 69,93% and contains minerals needed by soil plants. This potential cannot be directly utilized due to the acidic nature volcanic which can damage To used as fertilizer, process accelerated adding humic acid chicken manure. So purpose this study is manufacture fertilizer combining with manure characteristics fertilizer. In method extracting was using sodium hydroxide (NaOH) 0,25 M solution mixing acid. The results extract...
Minyak jelantah merupakan sisa penggunaan bahan pangan, jika di konsumsi akan berbahaya bagi kesehatan. Kegiatan penelitian ini bertujuan untuk menjernihkan minyak menggunakan adsorben kitozenus yaitu dari limbah kulit durian. Metode secara laboratorium dengan metode fisika dan kimia. Hasil dilihat kualitas setelah dijernihkan, mengetahui bilangan iod perubahan warna. Proses pembuatan durian diaktivasi KOH variasi konsentrasi 25%, 27% 30%. Yang sebelumnya melalui tahap karbonisasi setelahnya...