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Chemistry and Materials
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 5 Documents
 1 
Search results for , issue "Vol. 4 No. 1 (2025)" : 5 Documents clear
Effect of Mass and Contact Time of Coffee Grounds in Nickel Metal Ion Adsorption on Liquid Waste of Chemistry Laboratory Trinanda, Inez; Yussi Pratiwi; Tritiyatma Hadinugrahaningsih
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.86

Abstract

Based on Indonesian Government Regulation PP No. 22 of 2021 concerning the implementation of environmental protection and management, the quality standard for nickel in waters is 0.05 mg/L. Nickel waste is very harmful to aquatic and terrestrial ecosystems and poses risks to human health. In this study, nickel waste was treated with coffee grounds using the adsorption method. The purpose of this study was to determine the effect of variations in the mass of coffee grounds and contact time on the adsorption of nickel metal in the liquid waste generated by the UNJ Chemistry laboratory. Coffee grounds are activated with NaOH 0.01 M to increase their adsorption ability. Two tests were conducted, namely, the variation of adsorbent mass and the variation of contact time. Based on the results of testing the variation of adsorbent mass and contact time, the highest percentage of removal was obtained at 91.70% at a mass of 0.05 g with a contact time of 15 minutes. The lowest percentage of removal was 39.56% in a mass of 1.5 g with a contact time of 90 minutes. This research provides a novel approach to heavy metal waste treatment especially nickel metal ion, which can be adapted to enhance waste treatment technologies in the future.
The effect of Phase Composition on the Photocatalytic Activity of Cu₂O/CuO/Cu Composites for Methylene Blue Photodegradation Rizqi Maulana, Mokhamad Ali; Aisyaturridha; Bimo TriGoutomo; Amir Mahmud
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.87

Abstract

This study investigates the influence of phase composition on Cu₂O/CuO/Cu composites for the degradation methylene blue (MB) under visible light irradiation. Two types of composites, Cu₂O-rich and Cu₂O-poor, were successfully synthesized through electrodeposition method. The results showed that the Cu₂O-rich composite exhibited photocatalytic activity, as indicated by a maximum photocurrent of 13 mA/cm² and the highest optimized MB photodegradation efficiency. This enhanced performance is due to the high Cu₂O phase content, which generates a higher photocurrent density, thereby accelerating the redox reaction in the MB degradation.
PtSnNi Trimetallic and Their Catalytic Activities in Ethanol Electrooxidation Syafei, Hilman; Raudhatul Hadawiyah; Mulya Muhammad Nur
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.90

Abstract

The declining availability of fossil fuels and their environmental impacts have driven the search for cleaner, renewable energy alternatives, such as direct ethanol fuel cells (DEFCs). However, the widespread application of DEFCs faces challenges due to the complex kinetics of ethanol electrooxidation, necessitating the development of effective catalysts. Platinum (Pt) is widely regarded as the most effective catalyst for this process. However, its use is hindered by high costs and susceptibility to poisoning by intermediates formed during the ethanol electrooxidation reaction. To address these issues, the addition of Sn and Ni to the Pt catalyst is expected to enhance its performance. In this study, PtSnNi trimetallics were synthesized using the electrodeposition method. The samples were then characterized using scanning electron microscopy-energy dispersive spectroscopy (SEM-EDX) and electrochemical tests to evaluate their catalytic activity and stability. The SEM image reveals that PtSnNi2 has the smallest particle size compared to other PtSnNi samples. Additionally, the results indicate that PtSnNi2, with a composition of 73% Pt, 26% Sn, and 1% Ni, exhibits the optimal electrolyte concentration, leading to the highest catalytic activity and stability. This is evidenced by the lowest Rct, lowest Ib/If ratio, and highest current density in the ethanol oxidation reaction.
Synthesis of α-Fe2O3 and α-Fe2O3/SiO2 Composite from Geothermal Waste by Sol-Gel Method and Their Characterization Mulmeyda, Rinda; Reinardo Ramawijaya Widakusuma; Sabrina Putri Chaerani; Agus Purwanto; Rifqi Almusawi Rafsanjani; Habib Muhammad Zapar; Bagaskoro Pranata Ardhi
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.91

Abstract

Iron oxide materials, especially hematite (α-Fe2O3), have many important applications. Improving the characteristics and physical properties of hematite has been widely developed, one of which is to combine it as a composite structure with porous materials such as silica (SiO2) as α-Fe2O3/SiO2 composite. This research aims to synthesize α-Fe2O3 particles and α-Fe2O3/SiO2 composites. The α-Fe2O3/SiO2 composite was successfully synthesized by using geothermal waste as an alternative source of silica prepared by the sol-gel method. Both synthesized samples were characterized by X-ray diffraction, scanning electron microscopy equipped with energy dispersive spectroscopy, and X-ray fluorescence techniques. The results showed that silica composites on hematite structure slightly affect the morphology, color, or particle size compared to α-Fe2O3.
Morphology-Dependent Antioxidant Activity of Gold Nanoparticles Prepared Using Different Electrolyte Concentrations Abd Aziz, Azri Farhanah; Suliasih, Babay Asih
Chemistry and Materials Vol. 4 No. 1 (2025)
Publisher : Pusat Inovasi Sains

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.56425/cma.v4i1.93

Abstract

Antioxidants play a crucial role in protecting the body from oxidative stress by neutralizing free radicals. The synthesis of antioxidant-active materials, such as gold nanoparticles (AuNPs), offers significant advantages due to their unique physicochemical properties. In this study, AuNPs were successfully synthesized using the electrodeposition method on indium-tin oxide substrates, with varying Na₂SO₄ electrolyte concentrations. Scanning electron microscopy analysis confirmed that the synthesized AuNPs exhibited a round to slightly irregular morphology, with an average particle size ranging from 48 to 65 nm. X-ray diffractometer characterization revealed that the nanoparticles possessed a face-centered cubic crystal structure, confirming their high purity. Antioxidant activity was evaluated using the DPPH assay, where AuNPs synthesized with 0.5 M Na₂SO₄ exhibited the highest DPPH inhibition of 72.39%. This enhanced antioxidant performance is attributed to the smaller particle size, which increases the available surface area for free radical neutralization. These findings highlight the potential of electrodeposited AuNPs as effective antioxidants and provide valuable insights into optimizing nanoparticle synthesis for biomedical and nanotechnological applications.

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