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All Journal Jurnal Rekayasa Material, Manufaktur & Energi Indonesian Journal of Chemical Studies (Indones. J. Chem. Stud.) Sorption Studies
Sandri, Azzahra
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Aerospace Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology

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Reaction Mechanism in Standardized α-Cellulose Content Test: Study from Boehmeria nivea Fiber Rahmawati, Fani; Basuki, Rahmat; Fahri, Mirad; Apriliyanto, Yusuf Bramastya; Kurniadi, Tedi; Nareswari, Vania Agatha; Sandri, Azzahra; Istiqomah, Tiara
Indonesian Journal of Chemical Studies Vol. 3 No. 1 (2024): Indones. J. Chem. Stud., June 2024
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ijcs.v3i1.45

Abstract

In defense industry, α-cellulose is the main component of nitrocellulose propellant. However, a detailed description of the reaction mechanism of each treatment step in SNI 0444-2009 is still very scarce. This study addresses this gap by presenting the reaction mechanisms of each treatment and the symbols used in the SNI 0444-2009 procedure. The separation of lignin from α-cellulose occurred by breaking the C‒O bond linking them. This bond was broken by the ‒OH group of NaOH via a hydrolysis reaction. The reaction was initiated with the elimination of a hydrogen atom from the lignin structure by the hydroxyl ion (‒OH), and the C‒O bond was broken by a hydrolysis reaction. The breaking of this bond was indicated by the disappearance of the IR peaks at wavenumbers 1049 and 1190 cm–1 in the filtrate after extraction. The SNI 0444-2009 method for the α-cellulose content test was carried out by a redox back titration of Cr(VI) with Fe(II) from ferrous ammonium sulfate. This titration was conducted to calculate the amount of Cr(VI) ions in potassium dichromate or Cr(VI) that did not react with lignin or beta cellulose in the filtrate. Understanding the contribution and reaction mechanisms of each compound involved in the SNI 0444-2009 procedure contributed to obtaining accurate data on α-cellulose content. In this study, the calculated α-cellulose content of the flax fiber was 96.75%. Furthermore, the detailed mechanism of the redox reaction was discussed in detail in this paper.
Teknologi Tenda Militer Portabel Berbasis Tenaga Surya Dalam Mobilisasi Taktis Tempur Aritonang, Sovian; Fajri, Zaidan Al; Azida, Putry Wanda; Sandri, Azzahra; Dintyra, Muhammad Daffa
Rekayasa Material, Manufaktur dan Energi Vol 7, No 1: Januari 2024
Publisher : Fakultas Teknik UMSU

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30596/rmme.v7i1.17288

Abstract

Indonesia's extensive geography, spanning from Sabang to Merauke, provides an uninterrupted solar energy supply, thanks to its prolonged daylight hours. This presents an excellent opportunity for the country to embrace renewable and sustainable energy, with solar power being a convenient option given Indonesia's tropical climate. The conversion of solar heat into electrical energy is an attractive proposition, allowing for the use of portable solar panels to power military vehicles while minimizing reliance on fossil fuels. Efficient energy storage solutions are needed to convert solar thermal energy into electrical energy, and sodium batteries are a more potent and eco-friendly option. Portable solar panels also offer an energy source for various military operations, such as powering tents and charging communication equipment. By incorporating solar energy into their operations, the Indonesian army can increase their capabilities while reducing their reliance on conventional energy sources. In conclusion, harnessing the abundant sunlight and tropical climate in Indonesia through portable solar panels and sodium-based batteries is a dependable and sustainable solution to meet the energy needs of military operations. This approach enables Indonesian soldiers to carry out their missions efficiently while minimizing environmental impacts.
Adsorption Ni(II) on Magnetic Fulvic Acid-Chitosan: Kinetics and Isotherm Study Hutama, Raihansyah Raja; Aisyah, Audrey Nur; Sandri, Azzahra; Kuntjahjono, Mayang Fauziah Putri; Napoleon, Sultan; Apriliyanto, Yusuf Bramastya; Sasongko, Nugroho Adi; Basuki, Rahmat
Sorption Studies Vol. 1 No. 1 (2025): Sorption Studies, Vol. 1 No. 1 June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ss.v1i1.79

Abstract

Indonesia, as one of the most populous countries in the world, requires clean water sources. Industrial waste that is improperly discharged pollutes water bodies with hazardous metals. Adsorption is one of the effective methods for reducing the concentration of harmful metals in water. This study utilized fulvic acid extracted from goat manure compost and combined it with chitosan and magnetite as an adsorbent material for Ni(II). The FTIR results for the magnetite-fulvic acid-chitosan composite showed a peak at 1627 cm⁻¹, indicating the presence of aromatic C=C, aromatic ring -OH, and quinone C=O groups, which confirm the binding of fulvic acid. BET analysis was performed on magnetite and magnetite-fulvic acid-chitosan, and the pore volume and pore size were found to be 0.177488 cm³/g and 6.5394 nm, respectively. The composite exhibited magnetic behavior due to the attraction between the magnetite-fulvic acid-chitosan and an external magnet. Adsorption tests using isotherm and kinetic models revealed that Ni(II) adsorption followed a multilayer mechanism and pseudo-second-order kinetics, with a b value of 121.68 mg/g and an experimental qe of 6.28 × 10⁻⁵ mol/g. This shows that the magnetite-fulvic acid-chitosan composite is a promising, sustainable, and magnetically separable adsorbent for the effective removal of nickel ions from contaminated water.
Synthesis of Magnetite/Chitin/Fulvic Acid Derived from Goat Manure Compost and Adsorption Study of Zn(II) for Water Security Enhancement Aisyah, Audrey Nur; Sandri, Azzahra; Hutama, Raihansyah Raja; Kuntjahjono, Mayang Fauziah Putri; Napoleon, Sultan; Basuki, Rahmat
Sorption Studies Vol. 1 No. 1 (2025): Sorption Studies, Vol. 1 No. 1 June 2025
Publisher : Indonesian Scholar Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55749/ss.v1i1.82

Abstract

Water pollution due to heavy metals such as Zn(II) poses a risk to the environment and health. This study aims to synthesize Magnetite/Chitin/Fulvic Acid (AF)-based composite adsorbent from goat feces compost and evaluate its effectiveness in adsorbing Zn(II) ions. Fulvic acid was extracted through alkaline-acid method and synthesized together with chitin and magnetite using one pot coprecipitation method. Characterization using FTIR, XRD, and BET showed successful synthesis with mesoporous structure for BET (average pore size 6.15 nm, surface area 41.77 m²/g). Isotherm studies showed that the adsorption of Zn(II) showed a good fit with the Freundlich (R² = 0.9967) and Temkin (R² = 0.9968) models, indicating multilayer adsorption on the heterogeneous surface. The composite also shows good adsorption ability and can be magnetically separated, making it an environmentally friendly and efficient potential adsorbent for wastewater treatment applications.
Co-Authors Aisyah, Audrey Nur Aritonang, Sovian Azida, Putry Wanda Dintyra, Muhammad Daffa Fahri, Mirad Fajri, Zaidan Al Hutama, Raihansyah Raja Istiqomah, Tiara Kuntjahjono, Mayang Fauziah Putri Kurniadi, Tedi Napoleon, Sultan Nareswari, Vania Agatha Nugroho Sasongko Jati, Nugroho Sasongko Rahmat Basuki Rahmawati, Fani Yusuf Bramastya Apriliyanto