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All Journal Physics Student Journal Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences Indonesian Journal of Science and Technology Communications in Science and Technology Bulletin of Chemical Reaction Engineering & Catalysis
Muhammad Ibadurrohman
Department Of Chemical Engineering, Faculty Of Engineering, Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Engineering Environmental Science Physics

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PENENTUAN DOSIS FOTONEUTRON PADA PASIEN TERAPI LINAC 15 MV MENGGUNAKAN TLD-600H DAN TLD-100H Ibadurrohman, Muhammad; Noor, Johan A.E.; Sofyan, Hasnel
Physics Student Journal Vol 2, No 1 (2014)
Publisher : Department of Physics - Faculty of Science

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Telah dilakukan penelitian untuk menentukan dan mengetahui dosis fotoneutron yang dihasilkan linac 15 MV pada pasien terapi kanker menggunakan TLD-600H dan TLD-100H. TLD memiliki tingkat keseragaman sebesar 3% dan setiap kali pemakaian dilakukan annealing untuk semua TLD dengan suhu lebih rendah dari yang direkomendasikan (240oC) yaitu pada suhu 210oC selama 10 menit. Hal ini dilakukan agar sensitivitas TLD selama penelitian dapat dipertahankan sama. Pasangan TLD diletakkan pada posisi organ kritis menggunakan fantom antropomorfik berbahan polietilen sebagai pengganti pasien terapi kanker. Penyinaran menggunakan foton linac dengan dosis 2 Gy dan 3 Gy pada isocenter tubuh. Kemudian tanggapan TLD dibaca dengan alat baca TLD Harshaw Model 3500. Dosis fotoneutron didapatkan nilai bervariasi dengan dosis tertinggi sebesar 53±1,6 mSv untuk dosis foton 2 Gy dan 83±2,5 mSv untuk dosis foton 3 Gy. Nilai dosis neutron yang didapatkan menurun seiring dengan semakin jauhnya jarak dari isocenter tubuh. Ketidakpastian pengukuran sebesar ±3% berdasarkan keseragaman dan pengelompokan TLD. Semakin tinggi dosis foton yang diberikan saat terapi, kemungkinan dosis fotoneutron yang dihasilkan oleh linac juga tinggi dan semakin banyak yang akan berinteraksi dengan tubuh pasien.   Kata Kunci : TLD LiF:Mg,Cu,P, fantom antropomorfik, fotoneutron, linac 15MV, isocenter
Photocatalytic Degradation of Polyethylene Microplastics and Disinfection of E. coli in Water over Fe- and Ag-Modified TiO2 Nanotubes Yuwendi Yuwendi; Muhammad Ibadurrohman; Setiadi Setiadi; Slamet Slamet
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 2 Year 2022 (June 2022)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.2.13400.263-277

Abstract

In this study, Fe- and Ag-modified TiO2 nanotubes were synthesized via an anodization method as photocatalysts for degradation of polyethylene microplastics and disinfection of Escherichia coli (E. coli). The anodization voltage, as well as the Fe3+ or Ag+ concentrations on TiO2 nanotubes were evaluated and correlated to their corresponding photocatalytic properties. TiO2 nanotubes were firstly synthesized by anodization of Ti plates in a glycerol-based electrolyte, followed by incorporation of either Fe or Ag via a Successive Ionic Layer Adsorption and Reaction (SILAR) method with Fe(NO3)3 and AgNO3 as Fe and Ag precursors, respectively. UV-Vis DRS shows that the addition of Fe or Ag on TiO2 nanotubes causes a redshift in the absorption spectra. The X-ray diffractograms indicate that, in the case of Fe-modified samples, Fe3+ was successfully incorporated into TiO2 lattice, while Ag scatters around the surface of the tubes as Ag and Ag2O nanoparticles. A microplastic degradation test was carried out for 90 mins inside a photoreactor with UVC illumination. TiO2 nanotubes that are anodized with a voltage of 30 V exhibit the best degradation results with 17.33% microplastic weight loss in 90 mins. Among the modified TiO2 nanotubes, 0.03 M Ag-TiO2 was the only one that surpassed the unmodified TiO2 in terms of microplastic degradation in the water, offering up to 18% microplastic weight loss in 90 min. In terms of E. coli disinfection, 0.03M Ag-TiO2 exhibit better performance than its unmodified counterpart, revealing 99.999% bactericidal activities in 10 mins. Copyright © 2022 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0). 
Simultaneous Decolorization of Tartrazine and Production of H2 in a Combined Electrocoagulation and Photocatalytic Processes using CuO-TiO2 Nanotube Arrays: Literature Review and Experiment S. Slamet; Laily Fitri Pelawi; Muhammad Ibadurrohman; Rike Yudianti; R. Ratnawati
Indonesian Journal of Science and Technology Vol 7, No 3 (2022): IJOST: VOLUME 7, ISSUE 3, December 2022
Publisher : Universitas Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17509/ijost.v7i3.51315

Abstract

We reported the simultaneous decolorization of tartrazine and H2 production via electrocoagulation and photocatalysis using CuO-doped TiO2 nanotube arrays (TNTA) composites. Tartrazine was removed by the combination of adsorption, electrocoagulation, and photocatalytic degradation, while H2 was produced through water reduction at the cathode and water splitting process on the photocatalyst surface. The photoreactor contains CuO-TNTA as a photocatalyst and is equipped with an 80-W UV lamp. Deposition of CuO on TNTA was conducted using a successive ionic layer adsorption and reaction (SILAR) method. The nanotubular of the TNTA as well as the distribution of CuO were evaluated employing FESEM and HRTEM. XRD patterns confirmed weak diffraction of CuO and TNTA revealing an anatase crystallite phase. The band gap of the CuO-TNTA was also found to be redshifted from that of pure TNTA. The simultaneous processes with the combined systems (20 V, pH = 11) managed to remove 80% of tartrazine while producing a high H2 yield (1.84 mmol), significantly higher than those obtained by each process.
A Comparative Study of Pt Depositing Methods (Chemical Reduction vs Photo-Assisted Deposition) onto TiO2 Nanoparticles for Hydrogen Photo-Production Ratnawati Ratnawati; Slamet Slamet; Viona Wongso; Jarnuzi Gunlazuardi; Muhammad Ibadurrohman
Journal of Engineering and Technological Sciences Vol. 54 No. 6 (2022)
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.2022.54.6.12

Abstract

In this paper, we report a comparative study on two methods (chemical reduction and photo-assisted deposition) of incorporating Pt onto TiO2 nanoparticles (TNP) for H2 generation. The phase structure of the photocatalysts was scrutinized utilizing TEM and XRD. The degree of dispersion of Pt on the TNP was calculated by a pulse chemisorption technique using TPDRO equipment. The results provided by TEM imagery, EDX spectra, elemental mapping, and AAS confirmed the successful deposition of Pt on TNP. XRD patterns confirmed an anatase and rutile crystallite structure, while UV-Vis spectra showed reduction of the bandgap from a typical value of 3.2 eV to ca. 2.9 eV. It was found that there is a correlation between the deposited Pt and dispersed Pt on the TNP with H2 generation. The chemical reduction method offered a higher degree of Pt deposition, resulting in a 2.75 times larger amount of deposited Pt compared to photodeposition. This feature is perceived to contribute a higher H2 yield (3,283 µmol) at 1 w% of Pt loading.
A novel approach in the synthesis of CdS/titania nanotubes array nanocomposites to obtain better photocatalyst performance Pratiwi, Reno; Ibadurrohman, Muhammad; Listiani Dewi, Eniya; -, Slamet
Communications in Science and Technology Vol 8 No 1 (2023)
Publisher : Komunitas Ilmuwan dan Profesional Muslim Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21924/cst.8.1.2023.1049

Abstract

Studies that seek to improve the performance of photocatalyst continue to develop. Several observations have been made on the effect of using ultrasonic waves during the synthesis process of CdS/Titania Nanotubes Array (CdS/TiNTA) nanocomposites on an ability to degrade ciprofloxacin solution (CIP) and produce hydrogen. Therefore, the nanocomposite synthesis process uses the Successive Ionic Layer Adsorption and Reaction (SILAR) method, with (CH3COO)2Cd and Na2S as the precursors. During the SILAR process, sonication was applied for 60 minutes and carried out in the amorphous phase of TiO2 to increase the effectiveness of contact between the two semiconductors. The synthesis results were confirmed in term of their crystallinity, morphology, the presence of components on the surface, and the shift of bandgap by means of XRD, FESEM, FTIR, and UV-Vis DRS characterization, respectively. Photocatalytic activities of the nanocomposites were evaluated in a system containing 10 ppm CIP solution, on the purpose of observing their ability to degrade CIP and produce hydrogen. Our findings revealed an improvement in crystallinity, successful semiconductor coupling, and a band gap narrowing in the synthesized nanocomposites. Furthermore, the photocatalysts synthesized in the amorphous TiO2 and by sonication during SILAR offered doubled production capacity of hydrogen (0.191 mmol/m2) as compared to photocatalysts synthesized without sonication (0.092 mmol/m2). Compared to similar photocatalysts synthesized using the SILAR method in the crystalline phase, photocatalysts synthesized in the amorphous phase exhibited four-fold higher hydrogen production (0.044 to 0.191 mmol/m2). This prominent ability of the nanocomposites is related to the success of CdS adhering well to TiO2 surface to form nanocomposites, so that the bandgap energy position of CdS that is strong in the reduction reaction greatly contributes to improve the performance of the resulting photocatalyst, which is very advantageous in terms of its ability in water-splitting reactions.
Performance Test of Various Indonesian Natural Zeolites as Composite Components of NiMo/Al2O3-Zeolite Catalysts for Hydrocracking Used Cooking Oil into Biohydrocarbons Kurniawan, Amar Ariza; Rustyawan, Wawan; Ibadurrohman, Muhammad
Bulletin of Chemical Reaction Engineering & Catalysis 2025: BCREC Volume 20 Issue 1 Year 2025 (April 2025)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.20254

Abstract

Due to increasing demand for alternative energy sources, nonedible used cooking oil is being converted into biohydrocarbons as an eco-friendly renewable option. This study explores the use of three Indonesian zeolites; Lampung, Bayah, and Tasikmalaya as a composite components of NiMo/Al2O3-Zeolite catalysts to enhance conversion and yields, promoting the use of sustainable domestic resources. The NiMo/γ-Al2O3-zeolite catalyst, with alumina-to-zeolite ratios of 75:25 and 25:75, effectively converted used cooking oil into biohydrocarbons products—green diesel and gasoline. The NiMo/γ-Al2O3 (75%)-Bayah Natural Zeolite (25%) catalyst exhibited a surface area of 194 m²/g, pore volume of 0.45 cm3/g, 7.01% Mo content, and a crystal size of 117.74 nm. At 370 °C, this catalyst achieved a 93% conversion, with GC-simdis analysis confirming 13% gasoline and 78% diesel fractions. This research demonstrates that Indonesian natural zeolites can be effectively used to convert used cooking oil into biohydrocarbons, achieving high conversion and desired product selectivity. 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).
Co-Authors Agus Salim Afrozi, Agus Elfrida Ratnawati Eniya Listiani Dewi Eny Kusrini Hasnel Sofyan Jarnuzi Gunlazuardi Johan A.E. Noor Kurniawan, Amar Ariza Laily Fitri Pelawi R. Ratnawati Ratnawati Ratnawati Rike Yudianti S. Slamet Setiadi Setiadi Slamet - Slamet . Slamet Slamet Slamet Slamet Viona Wongso Wawan Rustyawan Yuwendi Yuwendi