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All Journal VALENSI International Journal of Renewable Energy Development JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Materi Indonesia Bulletin of Chemical Reaction Engineering & Catalysis Journal of Engineering and Technological Sciences EduChemia: Jurnal Kimia dan Pendidikan Chimica et Natura Acta Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Kartika Kimia EKOLOGIA : Jurnal Ilmiah Ilmu Dasar dan Lingkungan Hidup Jurnal Teknologi dan Manajemen Makara Journal of Science Molekul: Jurnal Ilmiah Kimia Environmental and Materials International Journal of Renewable Energy Development Bulletin of Chemical Reaction Engineering & Catalysis
Jarnuzi Gunlazuardi
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, University Of Indonesia, Depok 16424, West Java
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mathematics Physics

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Journal : Makara Journal of Science

 1 
Electrochemical Detection of Neuraminidase Based on Zanamivir Inhibition Reaction at Platinum and Platinum-Modified Boron-Doped Diamond Electrodes Ivandini, Tribidasari Anggraningrum; Ariani, Jenny; Jiwanti, Prastika Krisma; Gunlazuardi, Jarnuzi; Saepudin, Endang; Einaga, Yasuaki
Makara Journal of Science Vol. 21, No. 1
Publisher : UI Scholars Hub

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Neuraminidase sensors have been developed using platinum (Pt) and platinum-modified boron-doped diamond (Pt-BDD) electrodes based on the difference of electrochemical responses of zanamivir in the absence and in presence of neuraminidase. Cyclic voltammetry of zanamivir showed that the presence of zanamivir decreases the oxidation-reduction peak currents of Pt. The responses were found to be linear in the zanamivir concentration range of 7.5-150 μM. Comparison between Pt-BDD and Pt bulk electrodes showed that Pt-BDD offers approximately two times higher sensitivity of zanamivir responses than Pt bulk. Further comparison to gold-based electrodes showed that Pt-based electrodes provided about one order higher sensitivity of zanamivir responses. In the presence of neuraminidase, the oxidation-reduction currents of Pt again increase. Observation on the oxidation currents in the system with 2 x 10-5 M zanamivir showed that the responses were linear in the neuraminidase concentration range of 5-20 mU. Good reproducibility with an RSD < 3 (n = 10) was achieved even when the measurements were performed in a mucin matrix,suggesting that Pt-based electrodes are suitable to be applied for the detection method of neuraminidase.
Grass-Like Structured Mesoporous Carbon as an Acid Red 119 Dye Adsorbent Krisnandi, Yuni Krisyuningsih; Priantini, Tania; Faisal, Muhammad; Yunarti, Rika Tri; Saragi, Indah Revita; Gunlazuardi, Jarnuzi
Makara Journal of Science Vol. 23, No. 4
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Grass-like structured mesoporous carbon was prepared by the soft-template method using triblock copolymer Pluronic F127, affording an organic–organic composite structure between phloroglucinol and formaldehyde. Thermogravimetric analysis revealed that the as-synthesized mesoporous carbon is stable to 900 °C, and X-Ray Diffraction (XRD) analysis confirmed the presence of carbon material structures at 2θ values of 22.020° and 42.420°. A hysteresis loop at relative partial pressures (P/Po) between 0.45 and 0.85 was observed in the N2 adsorption isotherm, indicating that the solid material exhibits mesoporous characteristics, with a homogeneous pore size distribution of 8.863 nm. Scanning Electron Microscope (SEM) images revealed that the bulk carbon surface exhibits a uniform grass-like structure. Furthermore, the as-synthesized mesoporous carbon was investigated for the adsorption of a diazo dye Acid Red 119, and it exhibited an adsorption capacity of 217.7389 mg/g; this capacity is 1.53 times greater than that of commercial activated carbon. Therefore, this mesoporous carbon is a potential adsorbent for the treatment of synthetic coloring waste.
Magnetically Separable Fe3O4/SiO2/TiO2 Photocatalyst Composites Prepared through Hetero Agglomeration for the Photocatalytic Degradation of Paraquat Gunlazuardi, Jarnuzi; Fisli, Adel; Ridwan, Ridwan; Krisnandi, Yuni Krisyuningsih; Robert, Didier
Makara Journal of Science Vol. 25, No. 4
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A photocatalyst supported on magnetic material allows the simple technique by using an external magnetic material to separate photocatalyst from the treated water. Thus, it is a magnetically separable nanoparticles photocatalyst (MSNP). The use of superparamagnetic nanoparticles that do not pose spontaneous magnetic moment thus could be dispersed in water and can be recollected easily by an external magnetic bar. We prepare Fe3O4/SiO2/TiO2 composite by hetero agglomeration of Fe3O4/SiO2 and TiO2 at a pH range of 3 to 6.2 in an aqueous slurry.The Fe3O4/SiO2 was prepared via co-precipitation of iron (II) and iron (III) ionic solution containing ammonium hydroxide and sodium silicate. The prepared composites were characterized by XRD, TEM, FTIR, and VSM, while the photocatalytic activities were tested toward paraquat in water. Based on zeta potential values, the Fe3O4/SiO2and TiO2 were being hetero agglomerated at pH 5 to obtain Fe3O4/SiO­2/TiO2 composite. The XRD characterization confirmed the presence of anatase, rutile, and magnetite crystal phases. TEM images showed that the Fe3O4 was covered by SiO2 and randomly attached to TiO2. The observed FTIR peak at 940-960 cm-1 attributed to -Si-O-Ti- bonding mode, ensuring photocatalyst (TiO2) adherence to the Fe3O4/SiO2 cluster. The prepared Fe3O4/SiO2/TiO2 composite showed good photocatalytic activity for the paraquat removal and showed a good magnetic property (VSM measurement)
Comparative Study of Bismuth Ferrite Deposition Method on TiO2 Nanotube and Performance of Hydrogen Evolution in a Photoelectrochemical Dye-Sensitized Solar Cell Tandem System Yunita, Yunita; Syauqi, Muhammad Iqbal; Gunlazuardi, Jarnuzi
Makara Journal of Science
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Hydrogen is a renewable and environmentally friendly energy source that can replace fossil fuels by utilizing solar energy through water splitting. The hydrogen production was conducted in this research by using a tandem system of dye-sensitized solar cell–photoelectrochemical cell (DSSC–PEC) and a TiO2 nanotube coated with BiFeO3 (BiFeO3/TNT) as a photoanode in the PEC. The deposition of BiFeO3 on TNT was prepared using the following three methods: successive ionic layer adsorption and reaction (SILAR), ultrasonication-assisted SILAR, and ultrasonic– immersion method by varying the number of deposition cycles in each method. In this study, the optimum cycles for SILAR, ultrasonication-assisted SILAR, and ultrasonic–immersion methods were 15, 5, and 3, respectively. Results show that the BiFeO3 deposited on TNT using the ultrasonic–immersion method with three cycles (BiFeO3/TNT_UI3) demonstrates the best photoelectrochemical activity. The tandem system comprises BiFeO3/TNT_UI3 photoanode and Pt-coated TNT dark cathode PEC cell connected to TNT/N719-based DSSC with an efficiency of 1.27%. The constructed DSSC–PEC system could produce 3.11 × 10−6 mol hydrogen in 6 h with a solar-to-hydrogen (STH) efficiency of 0.0033% in an H-type reactor filled with 0.5 M H2SO4 electrolyte.
Modification of Gold Nanoparticles at Carbon Electrodes and the Applications for Arsenic (III) Detections Ivandini, Tribidasari Anggraningrum; Wijaya, Lany; Gunlazuardi, Jarnuzi
Makara Journal of Science Vol. 16, No. 1
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TiO2 Crystallization at Room Temperature and Preparation of Transparent Carbon Counter Electrode for Low-Cost Dye-Sensitized Solar Cells Syauqi, Muhammad Iqbal; Sanjaya, Afiten Rahmin; Madiabu, Mohammad Jihad; Khalil, Munawar; Gunlazuardi, Jarnuzi
Makara Journal of Science Vol. 27, No. 2
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We developed a low-cost dye-sensitized solar cell (DSSC) using TiO2 fabricated via rapid breakdown anodization (RBA) and ultrafast room-temperature crystallization (URTC). The prepared TiO2 was deposited on a self-made fluorine-doped tin oxide (FTO) conductive glass, and the FTO/TiO2 system was sensitized using curcumin dye. The DSSC was constructed by sandwiching the FTO/TiO2/curcumin electrode with an I−/I2 electrolyte and a transparent carbon counter electrode prepared using a liquid–liquid interface system. The characterization results showed that the TiO2 freshly prepared via URTC was transformed into an anatase crystalline phase, which exhibited a 3.10 eV band gap and a 10.08 nm average crystallite size, comparable to those of the TiO2 prepared via the conventional 450 °C annealing treatment (3.13 eV, 11.60 nm). The photocurrent activity of the URTC-prepared TiO2 under ultraviolet light (0.10 mA/cm2) was also comparable to that of the annealed TiO2 (0.12 mA/cm2). In addition, a transparent carbon electrode (FTO/Ct) was prepared successfully; it exhibited a ±58.26% transparency under visible light and comparable electrocatalytic activity to Pt-coated FTO. The DSSC based on FTO/TiO2-URTC/curcumin and FTO/Ct showed front and back illumination efficiencies of 0.47% and 0.26%, respectively. These results are only slightly lower than those of the conventional DSSC with FTO/annealed TiO2/curcumin//FTO/Pt, which exhibited front and back illumination efficiencies of 0.52% and 0.36%, respectively.
Co-Authors Abdul Wahid Wahab Adawiah Adawiah adawiah adawiah, adawiah Adel Fisli Agustino Zulys Andri Hermansyah Arda, Hany Dwi Ariani, Jenny Damayanti, Elok Defania, Mella Einaga, Yasuaki Eko Martin Sinaga Endang Saepudin, Endang Fatah, Fadhlir Rahman Aufar Al Harry Budiman Hedi Surahman Hedi Surahman Ida Nur Apriani Apriani Irkham Irkham Isnaini Rahmawati Ivandini Tribidasari Anggraningrum Jin Seog Kim Khoiriah Khoiriah Linda Jati Kusumawardani Madiabu, Mohammad Jihad Maemonah, Maemonah Misriyani Misriyani Misriyani Misriyani Muhammad Derry Luthfi Yudhi Muhammad Faisal Muhammad Fathurrahman Muhammad Ibadurrohman Muhammad Iqbal Syauqi Muhammad Iqbal Syauqi Munawar Khalil Neil V. Rees Oman Zuas Oman Zuas Paulina Taba Prastika Krisma Jiwanti Priantini, Tania Prita Amelia Prita Amelia Rahmat Wibowo Rahmat Wibowo Rahmat Wibowo RAHMAT WIBOWO Rahmawati, Isnaini Ratnawati Ratnawati Ridwan, Ridwan Robert, Didier Safni Safni Sanjaya, Afiten Rahmin Saragi, Indah Revita Sherly Kasuma Warda Ningsih Slamet Slamet Solly Aryza Suharyadi Suharyadi Supriyono Supriyono Supriyono Supriyono Syauqi, Muhammad Iqbal Utami, Chichi Amne Viona Wongso Wellia, Diana Vanda Wijaya, Lany Yasuaki Einaga Yunarti, Rika Tri Yuni K Krisnandi Yuni Krisyuningsih Krisnandi, Yuni Krisyuningsih Yunita Yunita Yunita Yunita