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All Journal IJOG : Indonesian Journal on Geoscience Jurnal Matematika & Sains Journal of Mathematical and Fundamental Sciences Journal of Engineering and Technological Sciences INDONESIAN JOURNAL OF APPLIED PHYSICS Indonesian Journal of Chemistry Akta Kimia Indonesia Journal of Environmental Science and Sustainable Development Indonesian Journal on Geoscience Indonesian Journal on Geoscience Bulletin of Chemical Reaction Engineering & Catalysis
Kadja, Grandprix Thomryes Marth
Division of Inorganic and Physical Chemistry, Institut Teknologi Bandung, Bandung, 40132
Humanities Astronomy Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Energy Engineering Environmental Science Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Electrochemical Sensor of Levofloxacin on Boron-Doped Diamond Electrode Decorated by Nickel Nanoparticles Prastika Krisma Jiwanti; Irfansyah Rais Sitorus; Grandprix Thomryes Marth Kadja; Siti Wafiroh; Yasuaki Einaga
Indonesian Journal of Chemistry Vol 22, No 5 (2022)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.73515

Abstract

Levofloxacin (LEV) was known as one of the fluoroquinolone antibiotics that widely used as an antibacterial agent. Monitoring of LEV is important due to its negative side effect on humans. The determination of LEV was studied for the first time on nickel modified on a boron-doped diamond (NiBDD) electrode using the square wave voltammetry (SWV) method to improve the catalytic and sensitivity of the sensor. The response was linear in the range of 30–100 mM LEV. LEV sensor on NiBDD was found to be selective in the presence of urea, glucose, and ascorbic acid interferences. Good reproducibility with % a relative standard deviation of 1.45% (n = 10) was achieved. Therefore, the NiBDD electrode could be potentially applied for the real detection method of LEV.
The Spatial Arrangement of The Electric Field in the Needle-Plate Electrospinning Ahmad Kusumaatmaja; Muhamad Nasrudin Manaf; Shiddiq Nur Hidayat; Kuwat Triyana; Farah Rahma; Grandprix T. M. Kadja; Muchammad Yunus
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 2 (2023): October
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v13i2.67191

Abstract

The electric field distribution of the Neddle-Plate (NP) electrospinning set up has reported due to the simple classical electrodynamics solutions. The charge is assumed to distribute uniformly in the needle (nozzle) and the collector (plate). The electric field has an influence only in the early stage of the electrospinning process. The electric field and the viscosity of the jet fluid have caused the bending of the straight jet. The high viscosity of the fluid can preserve the straight jet length much longer. The electric field gives the initial angular momentum of the jet due to the whipping motion of the jet. For the area away from the nozzle, the electric does not influence the whipping motion. Then the whipping motion solely due to the influence from the charge repulsion of the jet fluid and the evaporation of the solvent.
Removal of Heavy Metal Ions Using Pristine and Functionalized Natural Zeolites Khoirul Ihsan Solihin; St Mardiana; Handajaya Rusli; Grandprix Thomryes Marth Kadja
Indonesian Journal of Chemistry Vol 23, No 3 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.81098

Abstract

Heavy metal ions have attracted significant concern regarding their toxicity in living organisms. Concurrently, the removal of heavy metals by the adsorption method is also under the spotlight because it is effective, less cost-demanding, and easy to operate. To date, natural zeolites become one of the most used adsorbents for it is low cost, abundant in reserve, and has high selectivity towards heavy metal. Zeolites possess negatively charged three-dimensional frameworks built by SiO4 and AlO4 tetrahedra, which are balanced by counter-cations. The cations within zeolite frameworks can be exchanged with the heavy metal cations in an aqueous environment. This review comprehensively reports the adsorption capacity of heavy metal ions using pristine and modified natural zeolite. The important aspects, including the physicochemical properties of pristine and modified natural zeolites, heavy metal ion adsorption isotherms, kinetics, and thermodynamics, are discussed in detail. It is imperative to note that the physicochemical properties of natural zeolites greatly determine the adsorption capability. Furthermore, natural zeolites could be modified with various molecules such as surfactants and polymers to improve the adsorption capacity and adsorb heavy metal anions. Ultimately, this review is concluded with prospects for future improvement.
A Review on Zeolite Application for Aromatic Production from Non-Petroleum Carbon-Based Resources I. G. B. N. Makertihartha; Noerma Juli Azhari; Grandprix T.M. Kadja
Journal of Engineering and Technological Sciences Vol. 55 No. 2 (2023)
Publisher : Directorate for Research and Community Services, Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.eng.technol.sci.2023.55.2.3

Abstract

The application of zeolite catalyst has been expanded to support on-purpose sustainable technology. This review focused on zeolite application to produce aromatic compounds from non-petroleum carbon-based resources, including methanol, CO2, CO, and biomass. For COx resources, the two main routes for producing aromatics products are discussed, i.e., the olefinic and the oxygenates-mediated route. Moreover, several improvement strategies for enhancing catalytic performance are also discussed, i.e., the addition of metal components, tuning the metal and zeolite structure, and modifying the reaction process. Finally, prospects for future development are formulated.
Investigation on the Hydrothermal Condition in Synthesis of Active Matrix from Metakaolin: Physicochemical Properties and Intrinsic Cracking Activities Hudaya, Farhansyah Yusuf Putra; Anggaswara, Rezky Oktaviandy; Gunawan, Melia Laniwati; Kadja, Grandprix Thomryes Marth; Makertihartha, I. G. B. N.
Bulletin of Chemical Reaction Engineering & Catalysis 2024: BCREC Volume 19 Issue 3 Year 2024 (October 2024)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20181

Abstract

The current trends in research and development of FCC catalyst is focused on the formulation of active matrices that serve as pre-crackers, with the objective of reducing the diffusional resistance of the longer chain hydrocarbon molecule in the feed. In this study, an aluminosilicate active matrix was synthesised from metakaolin using hydrothermal method. The experimental variables that were varied were hydrothermal temperature, in the range of 80 to 110 °C, and hydrothermal time, in the range of 12 to 72 hours, to investigate the best conditions for synthesising the active matrix. Subsequently, the active matrix was subjected to a series of analyses, including X-ray fluorescence, X-ray diffraction, N2 physisorption, NH3-temperature programmed desorption, Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetry, with the objective of determining its composition, crystal characteristics, surface characteristics, acidity, functional groups, material structure, and thermal characteristics. Additionally, the active matrix was tested for its intrinsic cracking activity using the micro activity test (MAT). The results indicate that the best temperature for hydrothermal synthesis of the active matrix is 80 °C. The active matrix synthesised with a heating time of 24 hours demonstrated the highest light cycle oil yield, reaching 38.9 wt%. Meanwhile, the active matrix synthesised at 48 hours exhibited the most favourable characteristics, with a specific surface area of 144.23 m2/g and a pore volume of 0.9933 cm3/g, as well as the highest cracking conversion of 70.0 wt%. Copyright © 2024 by Authors, Published by BCREC Publishing Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).
Co-Authors Ahmad Kusumaatmaja Ahmad Kusumaatmaja Ainul Maghfirah Ana Hidayati Mukaromah Anggaswara, Rezky Oktaviandy Anita K. Wardani Buchari Buchari Enny Ratnaningsih FARAH FAHMA Farah Rahma Handajaya Rusli Hudaya, Farhansyah Yusuf Putra I Gede Wenten I Nyoman Marsih I. G. B. N. Makertihartha I.G.B Ngurah Makertihartha Ignatius Redyte Pratama Iqbal, Mochamad Irfansyah Rais Sitorus Ismunandar Khoiruddin Khoiruddin Khoirul Ihsan Solihin Kuwat Triyana Makertihartha, I. G. B. N. Melia L. Gunawan Melia Laniwati Gunawan Mita Rilyanti Moh. Mualliful Ilmi, Moh. Mualliful Muchammad Yunus Muhamad Ali Zulfikar Muhamad Nasrudin Manaf Muhammad Yudhistira Azis Mukti, Rino Rahmata Nicholaus Prasetya Noerma Juli Azhari Nurmalisa Lisdayana Nurul F. Himma Prastika Krisma Jiwanti Putu T.P. Aryanti Rino R. Mukti Rino Rakhmata Mukti Santoso, Nono Agus Shiddiq Nur Hidayat Siti Wafiroh St Mardiana Subagjo Subagjo Winda Br Purba Yasuaki Einaga