ORCID Profile
0000-0001-8152-5084
Current Organisations
Lampung University
,
Curtin University of Technology
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Publisher: Oriental Scientific Publishing Company
Date: 25-08-2017
DOI: 10.13005/OJC/330427
Publisher: Oriental Scientific Publishing Company
Date: 25-08-2017
DOI: 10.13005/OJC/330415
Publisher: IOP Publishing
Date: 06-2021
Abstract: Natural and synthetic zeolites are well-known materials sharing a wide range of applications, such as adsorbents, ion exchange, and catalysts. However, synthetic zeolites are more widely used, due to several limitations of natural zeolites, such as the presence of impurities and erse compositions. In this study, rice husk silica (97.86% purity) and aluminum hydroxide were utilized for the preparation of ZSM-5, to study the effect of crystallization time on the physical characteristics and catalytic activity in the transesterification of Ricinus communis oil. The raw materials, with molar ratio of SiO 2 :0.025Al 2 O 3 :0.165Na 2 O:25H 2 O, were subjected to crystallization at 180 °C for 48, 72, 96, and 120 h, completed by 6 h calcination at 600 °C. The formation of ZSM-5 was demonstrated by FTIR, XRD, and SEM techniques, confirmed that the formation of ZSM-5 had taken place at 48 h crystallization, with no significant change with prolonged time. The PSA indicates the existence of two clusters of particles, and the BET confirmed the existence of the zeolites as porous materials, with the s le prepared with crystallization time of 96 h had the largest surface area and smallest pore diameter. This particular s le exhibited the highest activity, resulting in 96% conversion of Ricinus communis oil.
Publisher: Elsevier BV
Date: 12-2013
Publisher: Elsevier BV
Date: 06-2014
Publisher: Asian Journal of Chemistry
Date: 2015
Publisher: Asian Journal of Chemistry
Date: 2023
DOI: 10.14233/AJCHEM.2023.24039
Abstract: The low cost and ease of production have led to widespread adoption of dye-sensitized solar cells (DSSCs). Therefore, this study aims to synthesize Schiff base compounds from salicylaldehyde and ethylenediamine as a sensitizer in DSSC. The Shiff base compound was synthesized using the condensation method with mol ratio of 1:1 and the results showed yellow crystals with a yield of 81.14%. Furthermore, the UV-Vis spectrometer analysis showed that the Schiff base compound has bathochromic shift with a maximum wavelength change from 324 and 328 nm to 335 nm with transition n→π, while the IR spectrum at wavenumber of 1610 cm-1 indicated the presence of an azomethine group (–C=N–). The TG-DTA analysis showed a mass loss stage of the Schiff base molecule at 97.2% in the temperature range of 180-300 ºC. Based on UV-Vis, IR and TG-DTA data, the synthesized Schiff base has the potential to be used as a sensitizer in DSSC. The fabrication was then carried out using two variations of semiconductor namely TiO2 and ZnO, three variations of PEG gel electrolyte with 0.05 M, 0.1 M and 0.15 M, as well as three counter electrodes including graphite from a pencil, candle flame and a combination of both. Based on the results, DSSC based on TiO2 semiconductor with 0.15 M PEG gel electrolyte and candle flame counter electrode produced the highest efficiency of 0.29 % with maximum voltage (Vmax) of 370 mV and maximum current strength (Imax) of 0.8 mA.
Publisher: Elsevier BV
Date: 05-2016
Publisher: Informa UK Limited
Date: 06-2017
Publisher: Oriental Scientific Publishing Company
Date: 23-08-2016
DOI: 10.13005/OJC/320435
Publisher: Pandawa Institute
Date: 30-01-2021
Abstract: In this research, magnesium oxide nanoparticles (MgONPs) was prepared from MgCl2 solution using aqueous extract of Moringa oleifera (M. oleifera) bark as green agent. Preparation procedure involved mixing of MgCl2.6H2O solution and the aqueous extract of M. oleifera bark, followed by drop wise addition of NaOH solution. The formation of MgONPs in this study was confirmed using UV-Vis absorption. The spherical crystal structure of MgONPs was confirmed by XRD analysis. The average particle size of the synthesized MgONPs was found between 60—100 nm using SEM and TEM images and PSA results. The MgONPs synthesized showed good antioxidant activity, as well as antibacterial activity against S. aureus, E. faecalis, E. coli, and S. dysenteriae bacteria.
Publisher: Elsevier BV
Date: 2013
Publisher: Oriental Scientific Publishing Company
Date: 25-03-2016
DOI: 10.13005/OJC/320143
No related grants have been discovered for Wasinton Simanjuntak.