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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 Journal of Engineering and Technological Sciences
Grandprix T.M. Kadja
Kelompok Keahlian Kimia Anorganik Dan Fisik, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung
Aerospace Engineering Humanities Astronomy Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Earth & Planetary Sciences Electrical & Electronics Engineering 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).
Effect of Ammonia, Urea, and Magnesium Modification on γ-Al2O3 Support in Enhancing the Catalytic Performance for Hydrodemetallization and Hydrodesulfurization Rustyawan, Wawan; Makertihartha, I. G. B. N.; Muraza, Oki; Gamar, Ismal; Nurdini, Nadya; Kadja, Grandprix T.M.; Rasrenda, Carolus B.
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 2 Year 2025 (August 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20360

Abstract

This research investigates the modification of γ−Al₂O₃ using ammonia, urea, and magnesium acetate to enhance its catalytic properties for hydrodemetallization (HDM) and hydrodesulfurization (HDS). Structural modifications affected the mineral composition, crystal size distribution, and textural properties of the support, with boehmite crystal sizes consistently ranging from 7 to 10 nm. Textural analysis indicated that alumina supports modified with urea and ammonia demonstrated enhanced characteristics, including elevated specific surface area (SBET), pore volume (VT), and pore size distribution (d), which are essential for catalytic performance. The modified catalyst (HM) exhibited significant hydrodemetalation efficiency, attaining metal removal rates of 98% for iron, 71% for vanadium, and 99% for nickel. In the HDS reaction, HM demonstrated the highest sulfur conversion of 20.9% at 315 °C, due to its capacity to sustain active site availability. The primary cause of catalyst deactivation was metal deposition, which resulted in pore blockage and diminished efficiency. The findings underscore the importance of support modification in enhancing catalytic performance, indicating HM as a viable catalyst for future heavy oil refining applications. Copyright © 2025 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).
Deeper Insight into the Rational Design and Synthesis of Zeolites Revealed by Machine Learning: A Mini Review Mardiana, St; S. F. Nanda, Arxhel; Arcana, I Made; Ismunandar, Ismunandar; Fajar, Adroit T. N.; Kadja, Grandprix T. M.
Journal of Engineering and Technological Sciences Vol. 57 No. 4 (2025): Vol. 57 No. 4 (2025): August
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.2025.57.4.4

Abstract

Zeolites are widely applied in various fields owing to their outstanding properties. However, our understanding on the nature of zeolite synthesis is not completed yet due to its high dimensional parameters. Machine learning has the ability to unravel fundamental relationships between complex parameters and predict the possible outcomes; thus, it can potentially reveal the nature of zeolite synthesis. This mini review highlights the current use of machine learning to comprehend the black box issue in zeolite synthesis. Conventional syntheses of zeolite were also elaborated to showcase the gap between traditional methods and machine learning approaches in zeolite synthesis. The future prospects of machine learning applications in zeolite synthesis are also discussed. This mini-review may bring crucial insights on the zeolite synthesis process.
Chloride Salt-Intercalated Ti2C Membranes for Ultraquick Cationic Dye Removal Fuja Sagita; Kholifatul Mukhoibibah; Grandprix T. M. Kadja
Journal of Engineering and Technological Sciences Vol. 58 No. 4 (2026): Vol. 58 No. 4(2026): August
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.2026.58.4.1

Abstract

Ti2C is a 2D nanomaterial with an ultrathin layered structure. This material has remarkable properties due to the -O, -F, and -OH functional groups in surface termination, which makes it hydrophilic and suitable for membrane applications. Herein, we reported the chloride salt-intercalated Ti2C membrane for methylene blue (MB) removal. The modification was done by a simple mixing method between chloride salt and Ti2C. First, Ti2C was synthesized from its parent phase of Ti2AlC using in-situ HF etchant. Then, Ti2C was modified using chloride salt (NaCl, KCl, MgCl2, and CaCl2), and mixed cellulose ester (MCE) was used as a membrane support to produce a MXene-based membrane (MXM). The results show that chloride salt ions enhance the interlayer spacing of Ti2C due to the ability of salt cation to be inserted and replace the Li+ as intercalant. This result is also evidenced by the difference in d-spacing in XRD analysis. In methylene blue removal, the flux of the membrane was excellent, around 2000-3000 L m-2 h-1, with a dye removal value above 97%. The high dye removal is correlated with the electrostatic interaction between the negative surface of Ti2C and the positive charge of MB. Then, the remarkable performance was reached by MXM-KCl with flux and rejection of 3303.31 L m-2 h-1 and 99.01%, respectively. The excellent flux of MXM-KCl correlated with the Gibbs free energy hydration of K+ is lower than the other salt cations (Na+, Mg2+, and Ca2+). In addition, all membranes exhibit great fouling resistance, with an FRR value of about 90%.
Co-Authors Ahmad Kusumaatmaja Ahmad Kusumaatmaja Ainul Maghfirah Ana Hidayati Mukaromah Anggaswara, Rezky Oktaviandy Anita K. Wardani Buchari Buchari Enny Ratnaningsih Fajar, Adroit T. N. FARAH FAHMA Farah Rahma Fuja Sagita Gamar, Ismal Handajaya Rusli, Handajaya Hudaya, Farhansyah Yusuf Putra I Gede Wenten I Made Arcana I Nyoman Marsih I. G. B. N. Makertihartha I.G.B Ngurah Makertihartha Ignatius Redyte Pratama indah asikin nurani Iqbal, Mochamad Irfansyah Rais Sitorus Ismunandar Khoiruddin Khoiruddin Khoirul Ihsan Solihin Kholifatul Mukhoibibah Kuwat Triyana Makertihartha, I. G. B. N. Mardiana, St Melia L. Gunawan Melia Laniwati Gunawan Mita Rilyanti Moh. Mualliful Ilmi, Moh. Mualliful Muchammad Yunus Muhamad Ali Zulfikar Muhamad Nasrudin Manaf Muhammad Yudhistira Azis, Muhammad Yudhistira Mukti, Rino Rahmata Muraza, Oki Nadya Nurdini Nicholaus Prasetya Noerma Juli Azhari Nurdini, Nadya Nurmalisa Lisdayana Nurul F. Himma Pindi Setiawan Prastika Krisma Jiwanti Putu T.P. Aryanti Rasrenda, Carolus B. Rino R. Mukti Rino Rakhmata Mukti S. F. Nanda, Arxhel S. Subagjo Santoso, Nono Agus Shiddiq Nur Hidayat Siti Wafiroh St Mardiana Wawan Rustyawan Winda Br Purba Yasuaki Einaga