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Chemistry and Materials

cma
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Published by The Center for Science Innovation

ISSN : 2828271X EISSN : 28282310 DOI : https://doi.org/10.56425/cma

Core Subject : Science,

Biochemistry, Genetics & Molecular Biology Chemistry Materials Science & Nanotechnology

Chemistry and Materials is a peer-reviewed journal published by The Center for Science Innovation (Pusat Inovasi Sains). The journal covers all aspects of Chemistry and Materials including synthesis, characterization, and applications. Theoretical and computational studies are also welcome.

Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)

Articles 52 Documents

1 2 3 4 5

The Effect of Electrodeposition Current and Electrolyte Composition on Electrodeposition of Fe-Ni Alloys Ghina Imani Rofi; Maria Paristiowati
Chemistry and Materials Vol. 1 No. 2 (2022)
Publisher : Pusat Inovasi Sains

This research was conducted to determine the effect of solution variations, electrical current, thickness, weight, metal composition, and the characteristics of the Fe-Ni alloy synthesized using the electrodeposition method. The instruments used in this study were atomic absorption spectroscopy (AAS) to determine the metal composition in the deposit, X-ray diffraction to determine the diffraction patterns, and scanning electron microscopy (SEM) to observe morphology and energy dispersive X-ray spectroscopy for elemental analysis. The SEM micrographs obtained showed that morphology of the Fe-Ni alloy was in the form of refined grains. The percentage of Fe in the deposit decreases with the increase in the used current. The AAS data also showed that a high Ni composition in solution will affect the atomic percent of each metal in the deposit. The formation of the alloy was confirmed by diffraction peaks at 2θ of 44°, 53°, and 76° that associated with reflection planes of the face centered cubic structure of Fe-Ni with the crystallite size range from 5 nm to 35 nm.

Synthesis and Characterization of Zero-Valent Iron Using Polyphenols Extracted from Kepok Banana Peel (Musa paradisiaca Normalis) Saul Panjaitan; Fera Kurniadewi; Setia Budi
Chemistry and Materials Vol. 1 No. 2 (2022)
Publisher : Pusat Inovasi Sains

This study aims to synthesize zero-valent iron (ZVI) with green-chemistry method. Synthesis was performed by reducing Fe2+ ion using polyphenol extract. The extract was obtained from banana peel that abundant in Indonesia and contain high of polyphenols. Synthesis of ZVI was carried out by reacting polyphenol extract to FeSO4 solution with different composition 1:4, 2:3, 1:1, 3:2, 4:1, and 4.5:0.5. The gas chromatography-mass spectroscopy spectrum confirmed the existence of polyphenols in the banana feel extract from the observed peaks assigned to 2-methoxy-4-vinylphenol, 4 methoxy-2-vinylphenol, and 2-methoxy-5-vinylphenol. Based on the atomic absorbtion spectroscopy data, the best composition for ZVI’s synthesis was 4:1 (polyphenol extract : FeSO4 solution). The fourier transform infrared spectroscopy spectrum shows that there was –OH group indicating a present of polyphenol in the synthesized ZVI. The energy dispersive X-ray spectroscopy shows that the sample contain of Fe, C, O, S, Ca, Cu, and Na. The X-ray diffraction analysis exhibit crystalline phase of a simple cubic structure of the synthesized ZVI. This results shows that the ZVI was successfully synthesized using environmentally benign reducing agent extracted from the banana peel.

Green Synthesis of Nanoscale Zero-Valent Iron and Its Activity as an Adsorbent for Ni(II) and Cr(VI) Novia Apriliani
Chemistry and Materials Vol. 1 No. 3 (2022)
Publisher : Pusat Inovasi Sains

Zero-valent iron nanoparticles (nZVI) were successfully synthesized by metal salt reduction method using cinnamon as a reductor agent. Particle size analysis showed that the most optimum composition of FeSO4 and polyphenols was at a ratio of 4:1, resulting in Dv(10), Dv(50), and Dv(90) values of 23.7 nm, 44.6 nm, and 178 nm, respectively. Scanning electron microscopy showed that nZVI was spherical and agglomerated. X-ray diffraction pattern showed a peak at 45.03˚ that corresponds to nZVI. The batch test showed that nZVI has Ni(II) and Cr(VI) adsorption activity of 95.58% Ni and 64.29%, respectively.

TEM Study of Irradiated PVC Embedded with Tin Complexes of Heterocyclic and Aromatic Moieties Anaheed A. Yaseen; Dina S. Ahmed; Dhuha H. Fadhil; Mohammed Kadhom; Muna Bufaroosha; Emaad T. B. Al‐Tikrity; Emad Yousif
Chemistry and Materials Vol. 1 No. 3 (2022)
Publisher : Pusat Inovasi Sains

Poly(vinyl chloride) (PVC) could be considered as one of the highly manufactured plastics with a production capacity of multiple millions tons per year. Fillers are recently added to PVC in an attempt to increase its applications in various sectors, especially at tough exposing conditions. Therefore, the current work reports the morphological studies of PVC sheets that contain trimethoprim-tin complexes as additives. The PVC was blended with a low concentration of trimethoprim-tin complexes and thin films have been prepared from the homogenous mixtures. The ultraviolet irritation impact on the morphology and physicochemical properties of the films was studied. It was found that the photodecomposition and photo-oxidation levels of PVC films were lower than the blank film’s ones. The TEM images showed that the undesirable changes in the surface of irradiated PVC films, such as the appearance of dark spots, cracks, and roughness, were minimized once the tin complexes were filled compared with the blank PVC.

In Silico Anti-Inflammatory Activity Evaluation from Usnea misaminensis through Molecular Docking Approach Ranggaweny Al-Ghani; Wita Putri Nirwani; Tria Nurwina Novianti; Adani Ghina Puspita Sari
Chemistry and Materials Vol. 1 No. 3 (2022)
Publisher : Pusat Inovasi Sains

Usnea misaminensis is an epiphytic medicinal plant from Indonesia that has several benefits, one of which is as an anti-inflammatory. This study aims to predict the ability of three compounds from Usnea misaminensis to inhibit the COX-2 enzyme as a source of prostaglandins using molecular docking. Receptors obtained from RSCB with PDB ID:5IKR were then prepared on UCSF Chimera 1.16 and the ligands (usnic acid, salizinic acid, and evernic acid) were downloaded 2D structure in .pdbqt format from PubChem. Docking simulation is done via AutoDock Vina 1.1.2 embedded in AutoDockTools 1.5.7. The docking results are visualized using PyMOL 2.5.2 and Biovia Discovery Studio Visualizer. Evernic acid showed binding energy (-6.8 kcal/mol) to the COX-2 receptor which was close to the binding energy value of the control ligand. Usnic acid and salazinic acid showed interactions with the same SER530 residue as the reference ligand. Compounds containing anti-inflammatory effects have the lowest binding energy and bind to residues as reference ligands. These results indicate that the compounds from Usnea misaminensis have potential as anti-inflammatory agents, but further research is needed to examine the potential anti-inflammatory activities.

Analysis of Co(II) Concentration Using Cyclic Voltammetry Technique Shynta Ramadhan; Gayatri Citra Dewi
Chemistry and Materials Vol. 1 No. 3 (2022)
Publisher : Pusat Inovasi Sains

Cobalt (Co), as one of the toxic and non-biodegradable heavy metals, has polluted most of the waters, which has an impact on human health and biotic components. Currently, the electrochemical method as a fast, accurate, and reliable technique for detecting heavy metals has been widely developed. Therefore, to obtain results with high accuracy, it is necessary to carry out the analysis under conditions suitable for the heavy metal to be analyzed. In this study, several parameters of Co metal content analysis, such as voltage range, scan rate, and pH were examined using the cyclic voltammetry technique. Metal content analysis using atomic absorption spectrometry was also carried out as a comparison. Based on the results of the analysis of Co metal in the waste solution, it shows that the measurement conditions for the analysis of Co(II) metal are each with a voltage range of 0.75 V to -1.5 V, a scan rate of 200 mV/s, and a pH of 7. The detection limit and quantization limit of Co(II) standard solution are 217.06 mg/L and 723.5 mg/L, respectively, with an RSD of 0.9% and a validity value of the correlation coefficient of 0.9992.

The Effect of Deposition Potential on the Electrodeposition of Platinum Nanoparticles for Ethanol Electrooxidation Amelia Sabella; Reyhan Syifa; Nandita Annisa Dwiyana
Chemistry and Materials Vol. 1 No. 3 (2022)
Publisher : Pusat Inovasi Sains

Platinum (Pt) nanoparticles were successfully prepared using square wave pulse deposition technique by varying the upper potential. The X-ray energy dispersive spectrum pattern confirmed the formation of Pt nanoparticles on the fluorine-doped tin oxide coated glass substrate. The results of scanning electron microscopy showed that the potential of 0.60 V was able to produced a large number of Pt particles with a unique morphology. The ethanol electrooxidation test conducted using cyclic voltammetry showed that Pt0.60v has the lowest charge transfer resistance value showing high catalytic activity which could be associated to the increase of particle number and its active sites that activated the redox reactions in the system.

Electrodeposition of CoNi Cocatalyst to Enhance Ethanol Electrooxidation of Zn-doped Cu2O-Cu Photocatalyst Alfian Putra Utama; Afrizal
Chemistry and Materials Vol. 2 No. 1 (2023)
Publisher : Pusat Inovasi Sains

In this research, the electrooxidation of ethanol was catalyzed using Zn-doped Cu2O-Cu/CoNi heterostructure syntesized using an electrodeposition method. Potential deposition of CoNi cocatalyst was varied to obtain the highest photoelectrochemical performance and photocatalytic activity of Zn-doped Cu2O-Cu/CoNi. The photoelectrochemical properties and photocatalytic activity investigated by electrochemical impedance spectroscopy, linear sweep voltammetry, and cyclic voltammetry. The increase of deposition potential from -1.3 V to -1.75 V increased the ethanol oxidation reaction. Zn-doped Cu2O-Cu/CoNi -1.75 V electrode showed superior photocatalytic activity for the ethanol electrooxidation compared to other electrodes. This photocatalyst showed a high photocurrent density of 22.47 mA/cm2. Moreover, cyclic voltammetry tests up to 100 cycles indicated that CoNi deposition potential at -2 V increased the long-term stability of the photocatalyst against the poisoning species than other electrodes. The fraction of CoNi enhanced CO tolerance and contributed to the higher specific activity towards ethanol electrooxidation. An excess number of CoNi at -2 V was found to decrease photocatalytic activity but increase the photostability of the material.

Phyllantin Extraction Using Imidazolium Ionic Liquids with Chloride and Bromide Anion by Microwaved Assisted Extraction Method Babay Asih Suliasih; Surya Geraldi; Hana Yunita Hidayat; Abdul Mun'im; Eko Aditya Rifai
Chemistry and Materials Vol. 2 No. 1 (2023)
Publisher : Pusat Inovasi Sains

Phyllanthin is known to have therapeutic properties such as immunomodulator, nephroprotective, and anticancer. Phyllanthin is a lignan compound that is commonly found in plants of the Phyllanthus genus, one of which is green meniran (Phyllanthus niruri). Solvent Ionic Liquid (IL) is one of the alternative solvents that are widely used for the extraction of compounds from a plant. The purpose of this study were to compare the extraction yield of philanthine compounds from meniran herbs using IL solvent by Microwave Assisted Extraction (MAE) with methanol by maceration method, and to determine the IL solvent that could produce the highest phyllanthin content. Optimization were carried out using the independent variables IL solvent concentration (0.25 M, 0.75 M, and 1.25 M) and sample-solvent mixture (1:10, 1:12, and 1:14). The variable modeling is designed using Response Surface Methodology that produced 9 runs of combination of solvent concentration and sample-solvent mixture ratio. The phyllanthin assay was using High Performance Liquid Chromatography (HPLC) with ethanol-water mixture (66:34) as mobile phase and wavelength at 229 nm for detection. The optimum extraction conditions showed the best results for imidazolium chloride IL at 1st run with a concentration of 0.75 M, the sample-solvent mixture of 1:14 and phyllanthin content of 0.1783 mg/g while imidazolium bromide IL at 7th run with a concentration of 0.75 M and the sample-solvent mixture of 1:12 and phyllanthin content of 0.23 mg/g. However, the methanol maceration method could only extract phyllanthin as much as 0.1319 mg/g. Based on these results, the use of IL-MAE was more effective than the methanol maceration method due to higher phyllantin extract.

Synthesis of Nanoscale Zero-Valent Iron with Polyphenol Extract from Cloves (Syzygium aromaticum) Through a Stepwise Reaction and Adsorption Test on Pb(II) Yuliana Dewi Anugrah; Annissa Amalia; Salma Fitri Annisa
Chemistry and Materials Vol. 2 No. 1 (2023)
Publisher : Pusat Inovasi Sains

Polyphenols from clove extract (Syzygium aromaticum) were successfully used as reducing agents to synthesize nanoscale zero-valent iron (nZVI). Optimization of nZVI synthesis was carried out by reacting polyphenols and FeSO4 at a composition of 0.25:4.75, 1:4, 2:3, and 3:2. The particle size analyzer showed that the smaller particle size distribution was obtained at nZVI 0.25:4.75, with values of D10 = 85.1 nm, D50 = 122 nm, and D90 = 175 nm. The results of the Pb(II) removal test showed that nZVI 0.25:4.75 had a fairly high percentage of Pb(II) removal, which was 96.4852% at 60 minutes. The smaller particle size of nZVI 0.25:4.75 compared to other samples is an important factor affecting the adsorption activity of Pb(II) in an aqueous medium.

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Kota adm. jakarta timur,

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INDONESIA