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Jurnal Crystal
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Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya
Published by Universitas PGRI Banyuwangi
ISSN : -     EISSN : 26857065     DOI : https://doi.org/10.36526/jc
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering
Jurnal crystal merupakan jurnal yang diterbitkan oleh program studi kimia Universitas PGRI Banyuwangi. Jurnal ini memuat dan menerbitkan jurnal yang sesuai dengan bidang ilmu kimia murni dan terapannya yang terbit dua kali dalam setahun yaitu bulan maret dan september. adapun penerbitan jurnal didasari dengan komitmen pada kelayakan penulisan artikel ilmiah, prosedur dan format penulisan, dan kontinuitas publikasi.
Arjuna Subject : -
Articles 122 Documents
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OPTIMIZATION OF VALUABLE MINERALS (MG2+ & K⁺) RECOVERY FROM SEAWATER USING RESPONSE SURFACE METHODOLOGY (RSM) Muchammad, Raka Selaksa Charisma; Aisyah Alifatul Zahidah Rohmah; Caecilia Pudjiastuti; Alifah Nur Aini Fajrin; Sumada, Ketut
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6284

Abstract

The extraction of metallic ions from seawater brine within a circular economy framework presents economic promise yet is hampered by concomitant ionic interference manifested during the precipitation of salts. The present investigation sought to characterize and subsequently to refine the co-precipitation steps for magnesium and potassium ions such that they yield suitable precursors for the synthesis of struvite fertilizer. The experimental work utilized a Response Surface Methodology built upon a Face-Centered Central Composite Design, interrogating the influence of the molar ratio of sodium hydrogen phosphate to calcium chloride and the duration of reaction on the simultaneous recovery of Mg²⁺ and K⁺. Results from the Analysis of Variance demonstrated that the principal effects of the aforementioned ratio, reaction duration, and their interaction terms were statistically significant for both target recoveries. By iterative optimization, the experimental framework predicted optimal operational parameters of sodium hydrogen phosphate to calcium chloride ratio of 0.401 and a reaction interval of 11.608 minutes, corresponding to a composite desirability statistic of 0.908 and estimated recoveries of 93.979 % and 97.300 % for magnesium and potassium ions, respectively. The data therefore substantiate the conclusion that Response Surface Methodology provides a systematic and analytically tractable conduit for the resolution of equilibrated brine mixtures, delineating a refined process envelope that promotes the extraction and economic valorization of essential mineral fertilizers from industrial saline streams.
PREPARATION STUDY OF FE₃O₄-COCONUT SHELL CHARCOAL AS A CARBON QUANTUM DOTS CQDS BASED NANOPARTICLE MATERIAL Yoshi Adhitia Mahendra; Siti Khomsatin
Jurnal Crystal : Publikasi Penelitian Kimia dan Terapannya Vol. 7 No. 2 (2025): Literasi Artikel Penelitian Kimia
Publisher : Program Studi Kimia, Fakultas MIPA, Universitas PGRI Banyuwangi

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36526/jc.v7i2.6297

Abstract

This research aims to study the preparation of Fe₃O₄ nanoparticles based on coconut shell charcoal as a carbon source for Carbon Quantum Dots (CQDs) using the hydrothermal method. The synthesis of Fe₃O₄ nanoparticles was carried out through the coprecipitation method by mixing FeCl₃·6H₂O and FeSO₄·7H₂O solutions while stirring at 60°C, followed by the addition of CQD solution derived from coconut shell charcoal. The variable parameters include the mass of coconut shell charcoal, reaction temperature, and precursor concentration. Characterization was performed using X-ray Diffraction (XRD) to determine the optical properties, crystal structure, and magnetic properties of the resulting nanoparticles. The results indicate that Fe₃O₄-CQD nanoparticles possess a specific crystal structure and magnetic properties suitable for applications in bioimaging and catalysis. This research contributes to the utilization of organic waste as a raw material for environmentally friendly nanomaterials and has the potential to enhance the economic value of coconut waste. Suggestions for future development include optimization of synthesis parameters and performance testing of the material in real-world applications.

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