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All Journal Journal of Mathematical and Fundamental Sciences Journal of Science and Applicative Technology ENSAINS JOURNAL Molekul: Jurnal Ilmiah Kimia Jurnal Teknologi Bahan dan Barang Teknik
Ahmad Nuruddin
Advanced Functional Materials Research Group, Institut Teknologi Bandung
Arts Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Social Sciences

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 1 
Preparation of Polycrystalline Silicon from Rice Husk by Thermal Decomposition and Aluminothermic Reduction Ahmad Nuruddin; Brian Yuliarto; Adhitya Gandaryus Saputro; Badruzaman Badruzaman; Aditianto Ramelan
Molekul Vol 15, No 1 (2020)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (617.989 KB) | DOI: 10.20884/1.jm.2020.15.1.568

Abstract

Polycrystalline silicon was extracted from rice husk by thermal decomposition and aluminothermic methods. Rice husk was thermally decomposed under various heat treatments and acid purifications. High purity silica of 99.81% was obtained by subsequent rice husk washing, pressure cooking in mixed chloride acid peroxide solution, and burning at 500oC for one hour. Aluminothermic reduction of silica was conducted at various calcination temperatures. It is found that 78.6% of silica was converted to silicon for calcination temperature of 800oC. Leaching the reduction product with strong hydrochloric and hydrofluoric acids produced silicon polycrystalline with a purity of 99.91%.
PENGARUH WAKTU CURING TERHADAP KUAT TEKAN GEOPOLIMER BERBASIS FLY ASH Andrie Harmaji; Claudia Claudia; Lia Asri; Bambang Sunendar; Ahmad Nuruddin
ENSAINS JOURNAL Vol 2, No 1 (2019): ENSAINS Journal Januari 2019
Publisher : UNIVERSITAS KEBANGSAAN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (0.272 KB) | DOI: 10.31848/ensains.v2i1.152

Abstract

Abstract:. Suralaya power plant produces fly ash about 219.000 ton per year. Fly ash contents of silica and alumina as major components that can be used as precursors for geopolymer, a three dimensional networks aluminosilicate polymers. This research aim is to utilize fly ash for geopolymer made by mixing fly ash, fine aggregate, and alkali activator in a cubic mould and curing was carried out at room temperature for 7 and 28 days. After 28 days of curing the compressive strength of geopolymer reached 41.70 MPa. XRD characterization shows Albite (NaAlSi3O8) formation which has similarity to geopolymer compound. Fourier Transform Infra Red spectra show siloxo and sialate bond. These are typical functional groups that are found in geopolymer materials.Keyword: geopolymer, fly ash, aluminosilicate, alkali activator, albite, siloxo, sialateAbstrak: Pembangkit Listrik Tenaga Uap (PLTU) Suralaya menghasilkan fly ash (abu terbang) sekitar 219.000 ton per tahun. Fly ash memiliki silika dan alumina sebagai komponen utama yang dapat digunakan sebagai prekursor untuk geopolimer, suatu material polimer aluminosilikat tiga dimensi. Penelitian ini bertujuan untuk memanfaatkan fly ash untuk geopolimer yang dibuat dengan mencampur fly ash, agregat halus, dan aktivator alkali dalam cetakan kubik dan pengawetan dilakukan pada suhu kamar selama 7 dan 28 hari. Setelah 28 hari curing kekuatan tekan geopolimer mencapai 41,70 MPa. Karakterisasi XRD menunjukkan pembentukan Albite (NaAlSi3O8) yang memiliki kemiripan dengan senyawa geopolimer. Hasil spektroskopi Fourier Transform Infra Red (FTIR) menunjukkan ikatan siloxo dan sialate yang merupakan gugus fungsional khas yang ditemukan dalam geopolimer.Kata Kunci: geopolimer, abu terbang, aluminosilikat, alkali aktivator, albite, siloxo, sialate
Pengaruh Kitosan terhadap Kristalinitas dan Morfologi Partikel Lithium Titanat Bharata Dewanto; Bambang Sunendar Purwasasmita; Ahmad Nuruddin; Abdul Halim Daulay; Susanto Sigit Rahardi
Jurnal Teknologi Bahan dan Barang Teknik Vol 4, No 2 (2014)
Publisher : Center for Material and Technical Product

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.665 KB) | DOI: 10.37209/jtbbt.v4i2.46

Abstract

Battery consists of cathode, anode, and electrolyte. Spinel Lithium Titanate, known as Li4Ti5O12spinel is an alternative material for anode substituting carbon due to its ability to generate large current for high-discharged battery. It can be applied for the electric car battery.A commonly used battery synthesis method is High Energy Ball Milling. However, that method is time consuming and require massive amount of energy. In this research, Li4Ti5O12­synthesized as an anode for lithium ion battery through sol-gel method with chitosan variable as the dispersing agent. Formed gel then calcinated with temperature of 750oC. Synthesized powder was characterized using XRD (X-ray Diffractometry) and SEM (Scanning Electron Microscopy) methods.Li4Ti5O12 was successfully synthesized with sol-gel method and chitosan as the dispersing agent. Based on the XRD characterization result, at the 750oC calcination temperature, 95–97%. Li4Ti5O12 phase was formed. Chitosan played a good role of being the dispersing agent because it was able to increase crystallinity, reduce the size of Li4Ti5O12powder particle, and reduce the particle agglomeration. Observation with SEM shows that the particle size is categorized as submicron, which size is ranged in 75–300 nm. It is potential to be used as the material for lithium battery anode that come near to theoretical capacity. Baterai terdiri dari katoda, anoda, dan elektrolit. Lithium titanat spinel atau Li4Ti5O12  spinel adalah material anoda alternatif untuk menggantikan karbon karena memiliki kemampuan untuk memberikan arus besar yang dapat diaplikasikan sebagai baterai pada mobil listrik.Metode yang saat ini sering digunakan untuk pembuatan baterai adalah High Energy Ball Milling, namun energi yang dibutuhkan sangat besar dan waktu pengerjaan dengan metode ini pun cukup lama. Dalam penelitian ini dilakukan sintesis serbuk Li4Ti5O12 ­sebagai anoda baterai lithium ion dengan metode sol-gel dengan variabel kitosan sebagai dispersing agent. Gel yang terbentuk dikalsinasi pada variasi suhu 750oC. Serbuk hasil sintesis dikarakterisasi menggunakan metode XRD (X-ray Diffractometry) dan SEM (Scanning Electron Microscopy). Pada penelitian ini telah berhasil disintesis Li4Ti5O12 dengan metode sol-gel dengan  kitosan sebagai  dispersing agent. Pada suhu kalsinasi 750oC terbentuk 95–97% fasa Li4Ti5O12 yang diketahui dari berdasarkan hasil karakterisasi XRD, kitosan berperan baik sebagai dispersing agent karena dapat meningkatkan kristalinitas, memperkecil ukuran partikel dari serbuk Li4Ti5O12, dan mengurangi aglomerasi partikel. Hasil pengamatan dengan SEM menunjukkan bahwa ukuran dari partikel tergolong pada ukuran submikron yaitu berkisar 75–300 nm yang berpotensi sebagai material anoda baterai lithium yang mendekati kapasitas secara teori.
Oxygen Reduction Reaction Mechanism on the Square Paddle-Wheel Cage Site of TM-BTC (TM=Mn, Fe, Cu) Metal-Organic Framework Ahmad Nuruddin; Adhitya Gandaryus Saputro; Syauqi Abdurrahman Abrori; Arifin Luthfi Maulana; Virgiawan Listanto Rahagung; Mohammad Kemal Agusta; Fadjar Fathurrahman; Amrina Mustaqim; Hermawan Kresno Dipojono
Journal of Mathematical and Fundamental Sciences Vol. 54 No. 2 (2022)
Publisher : Directorate for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2022.54.2.2

Abstract

Our study examined the mechanism of oxygen reduction reactions (ORR) at the square paddle-wheel cage active site of TM-BTC metal-organic frameworks (MOFs), where TM is a transition metal, Mn, Fe, or Cu. We used a combination of density functional theory (DFT) and microkinetic calculations to investigate this mechanism. By using a small cluster for modeling the TM-BTC active site structure, we successfully reproduced the experimental trend of ORR activity in the TM-BTC systems: Mn-BTC > Fe-BTC > Cu-BTC. We also found that the unusual ORR activity trend in experiments for Mn and Fe systems originates from the strength of OH adsorption on these systems. The Mn-BTC system exhibits higher ORR activity than the Fe-BTC system due to its weaker adsorption of OH groups. A very strong OH adsorption makes the final OH reduction step sluggish, hence hindering the ORR process.
Isolasi Nanoselulosa Terkarboksilasi dari Limbah Kulit Pisang Ambon Lumut dengan Metode Oksidasi Ashari Budi Nugraha; Ahmad Nuruddin; Bambang Sunendar
Journal of Science and Applicative Technology Vol 5 No 1 (2021): Journal of Science and Applicative Technology June Chapter
Publisher : Lembaga Penelitian dan Pengabdian Masyarakat (LPPM), Institut Teknologi Sumatera, Lampung Selatan, Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35472/jsat.v5i1.413

Abstract

In this study, banana peel from ambon lumut (Musa acuminata) was used as source for nanocellulose fibers. Carboxylated nanocellulose was isolated with oxidation method using ammonium persulfate (APS). In order to investigate the effect of temperature towards the characteristics of nonocellulose, temperature for oxidation process was set at three different values: 60 °C, 70 °C, dan 80 °C. Nanostructure of cellulose was observed as a mix of fibers and whiskers from transmission electron microscopy (TEM) images. The diameter of nanocellulose is ranging from 12,1 to 25,1 nm. Data from spectrometry graphs (FTIR) confirms the existence of carboxyl functional groups in nanocellulose samples. X-ray diffraction pattern (XRD) shows that crystallinity index values increase as temperature of oxidation process increases. The highest crytallinity index value of 72,4% was obtained from nanocellulose treated with oxidation temperature of 80 °C. This analysis shows banana peel waste as a potential alternative source for carboxylated nanocellulose.
Co-Authors Abdul Halim Daulay Adhitya Gandaryus Saputro Aditianto Ramelan Amrina Mustaqim Andrie Harmaji Arifin Luthfi Maulana Ashari Budi Nugraha Badruzaman Badruzaman Bambang Sunendar Bambang Sunendar Bambang Sunendar Purwasasmita Bharata Dewanto Brian Yuliarto Claudia Claudia Fadjar Fathurrahman Hermawan Kresno Dipojono Lia Asri Mohammad Kemal Agusta Susanto Sigit Rahardi Syauqi Abdurrahman Abrori Virgiawan Listanto Rahagung