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All Journal FLUIDA Sainteknol : Jurnal Sains dan Teknologi
Muhammad Salman Alfarisi
Politeknik Negeri Bandung
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Engineering Environmental Science Materials Science & Nanotechnology Other

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SINTESIS LI-NMC MELALUI METODE SOLID STATE MENGGUNAKAN MHP DAN NISO4 SEBAGAI VARIASI SUMBER NIKEL Haryadi; Iwan Ridwan; Muhammad Salman Alfarisi; Rizky Yanuar Haz
Fluida Vol. 18 No. 2 (2025): FLUIDA
Publisher : Department of Chemical Engineering, Politeknik Negeri Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/fluida.v18i2.6557

Abstract

Li-NMC-based cathodes are widely developed for next-generation batteries due to their high electrochemical performance and energy density. This study focuses on synthesizing Li-NMC type NMC811 using two nickel sources Mixed Hydroxide Precipitate (MHP) and nickel sulphate (NiSO4) through the solid state method. The process involved calcination at 500°C for 5 hours and sintering at 700oC, 800oC, and 900oC for 12 hours. The aim was to analyze the effect of temperature and nickel source on the crystallinity and crystal size of Li-NMC. X-Ray Diffraction (XRD) revealed that low crystallinity was observed at 700oC due to broad and weak diffraction peaks. Sintering at 800oC improved the structure and showed the presence of a Li0.88Mn2O4 phase. At 900oC, samples showed sharp peaks and high intensity, indicating excellent crystallinity. Crystal size analysis using the Debye-Scherrer equation showed that NiSO4 samples reached 41.98 nm at 800oC, while MHP samples achieved 71.69 nm at 900oC both exceeding the commercial size of 29.56 nm. These results suggest that 800-900oC is optimal for Li-NMC synthesis, and MHP is a promising alternative nickel source.
Study on the Effectiveness of H₂SO₄ Activated Coffee Grounds and Imperata cylindrica Bioadsorbents for Methylene Blue Adsorption Unung Leoanggraini; Tifa Paramitha; Rahma Ardelia Raissa; Mutiara Nur Annisa; Muhammad Salman Alfarisi; Radianti Novita Sari; Rony Sihombing
Sainteknol : Jurnal Sains dan Teknologi Vol. 24 No. `1 (2026): `June 2026
Publisher : Universitas Negeri Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/sainteknol.v24i`1.63663

Abstract

Textile wastewater with methylene blue dye causes serious environmental issues because of its toxicity, persistence, and negative effects on aquatic life. Using agricultural waste as bioadsorbents provides a sustainable and low-cost way to remove dye from wastewater. The goal of this study was to assess how effective H₂SO₄-activated bioadsorbents made from coffee grounds and Imperata cylindrica are for methylene blue adsorption in batch systems. We prepared the bioadsorbents by carbonizing them at 450°C, followed by chemical activation with 2 M sulfuric acid. We characterized them using FTIR and SEM to study functional groups and surface shape. We conducted batch adsorption experiments by changing the adsorbent mass (0.15–0.3 g), contact time (30–120 minutes), and methylene blue concentration (10–100 mg/L). Langmuir and Freundlich isotherm models were used to evaluate the adsorption behavior. The results showed that activated coffee grounds and Imperata cylindrica had improved porosity and changes in functional groups after activation. The best adsorption conditions were found with an adsorbent mass of 0.3 g, a contact time of 120 minutes, and a methylene blue concentration of 10 mg/L, reaching an adsorption efficiency of up to 97.498%. The adsorption process fit the Langmuir isotherm model better, with maximum adsorption capacities of 42.735 mg/g for coffee grounds and 13.210 mg/g for Imperata cylindrica. These findings suggest that coffee grounds and Imperata cylindrica are promising, cost-effective bioadsorbents for removing methylene blue in textile wastewater treatment.
Co-Authors Haryadi, Haryadi Iwan Ridwan Mutiara Nur Annisa Paramitha, Tifa Radianti Novita Sari Rahma Ardelia Raissa Rizky Yanuar Haz rony sihombing Unung Leoanggraini