SYNTHESIS OF SPIROOXINDOLE-PYRROLIZIDINE COMPOUNDS USING Fe3O4-GO CATALYST AND THEIR BIOACTIVITY ASSAYS

Hapsari, Mutiara; Cahyana, Antonius Herry; Oktavia, S. H.; Liandi, Agus Rimus

doi:10.31788/rjc.2020.1345583

Cited by 11 publications

(3 citation statements)

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“…The addition of H2O2 was carried out to remove the remaining KMnO4 or to stop the reaction, and the solution finally turned yellow, indicating the presence of graphene oxide [14]. Finally, add 67 mL of distilled water to the mixture, and Graphene Oxide (GO) will be formed [15].…”

Section: Methodsmentioning

confidence: 99%

Analysis of Microwave Absorption Properties of Graphene Oxide from Rice Husk Waste

Oktafiani,

Ramli,

Darvina

et al. 2023

Pillar of Phys.

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Graphene Oxide (GO) was synthesized with variations in carbonization temperatures of 250 °C, 300 °C, and 350 °C using the modified Hummers method. The results of the synthesis of GO will then be tested for microwave absorbing properties because it can be applied in various fields, such as information technology, medical equipment, industry, polymer synthesis, and organic synthesis. Therefore, in this report, GO uses rice husk waste instead of graphite as a carbon source because rice husk waste is abundant in nature and easy to obtain than graphite. In addition to reducing waste in Indonesia, this study aimed to determine the crystal size and GO functional groups and analyze the properties of microwave absorbers. X-ray diffraction (XRD) was used to determine the crystal size. The GO functional groups were determined using Fourier Transform Infrared (FTIR), and the microwave absorption characteristics of GO were analyzed using a Vector Network Analyzer (VNA). The XRD results show GO peaks between 26° peaks and 44° peaks. In the FTIR results, there are a collection of GO practices, in particular CO, C = C, and C = O. In the VNA results, the best microwave absorption properties are at an ignition temperature of 350 °C with the lowest reflection value - 39.95 dB, the highest absorption coefficient is 99%, and the absorption bandwidth is 0.06 GHz at a frequency of 8.5 GHz

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Section: Methodsmentioning

confidence: 99%

Analysis of Microwave Absorption Properties of Graphene Oxide from Rice Husk Waste

Oktafiani,

Ramli,

Darvina

et al. 2023

Pillar of Phys.

View full text Add to dashboard Cite

show abstract

“…The addition of H 2 O 2 was carried out to remove the residue from KMnO 4 or to stop the reaction and the solution finally turned yellow which indicated the presence of graphene oxide [16]. The last step is to add 50 mL of distilled water to the mixture and form GO [17].…”

Section: Methodsmentioning

confidence: 99%

Structure Analysis Of Graphene Micro Oxide From Old Coconut Shell Waste

Nanda

Ramli

2022

Pillar of Phys.

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Synthesis of graphene oxide from old coconut shell waste material. It has many applications, one of which is used as a microwave absorber. Old coconut shells are used as waste because the ingredients are easy to get. This study aims to analyze the microstructure of graphene oxide from old coconut shell waste. In the carbonization process using a furnace with temperature variations from 250˚C to 450˚C, the furnace time is 120 minutes. Making activated charcoal from old coconut shells using the modified hummers method with oxidizing agents KmnO2, H2SO4, and NaNO3. Characterization of graphene oxide from old coconut shell waste using FTIR, XRD and SEM. The test results using FTIR on GO samples show the formation of GO material where the sample contains functional groups containing bonds between carbon (C), Hydrogen (H) and Oxygen (O), the highest crystal size on XRD is 43.20800529 nm, and particle size the best SEM was obtained at GO 250˚C with a particle size of 65.701671 nm where the larger the particle size, the larger the surface pores of the sample, so that the better microwave absorbent was produced.

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“…The antioxidant activity test was carried out by free radical scavenging activity with the DPPH method [26][27]. An amount of 1 mM DPPH was diluted in ethanol to obtain 0.1 mM DPPH solution.…”

Section: Antioxidant Activity Testmentioning

confidence: 99%

Iodine-catalyzed Synthesis, Antibacterial, and Antioxidant Activity of Isatin Derivatives

Cahyana,

Liandi,

Ongkowidjawa

2024

Indones. J. Chem.

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Isatin is a unique compound with many bioactivities such as antiviral, anti-HIV, antitumor, anti-inflammatory, anticonvulsant, and antifungal. In this study, isatin derivatives were synthesized with an iodine catalyst and tested for antibacterial and antioxidant activities. Isatin derivatives were conducted through a Knoevenagel condensation reaction between isatin and malononitrile. The products were confirmed by thin-layer chromatography, melting point apparatus, FTIR, UV-vis spectroscopy, and LC-MS. The optimum reaction conditions were obtained at 10% mol of catalyst, at boiling point ethanol solvent for 30 min. The yield of the isatin derivative products was 71% (3a), 61% (3b), and 67% (3c). The antibacterial activities of the synthesized compounds were weak activity against S. aureus and E. coli. The antioxidant activity test resulted in IC50 values of 266.47, 220.43, and 654.85 ppm for compounds 3a, 3b, and 3c, respectively. The synthesis method using an iodine catalyst in this reaction offers a higher product yield compared to a catalyst-free reaction.

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SYNTHESIS OF SPIROOXINDOLE-PYRROLIZIDINE COMPOUNDS USING Fe3O4-GO CATALYST AND THEIR BIOACTIVITY ASSAYS

Cited by 11 publications

References 0 publications

Analysis of Microwave Absorption Properties of Graphene Oxide from Rice Husk Waste

Analysis of Microwave Absorption Properties of Graphene Oxide from Rice Husk Waste

Structure Analysis Of Graphene Micro Oxide From Old Coconut Shell Waste

Iodine-catalyzed Synthesis, Antibacterial, and Antioxidant Activity of Isatin Derivatives

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