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ALCHEMY Jurnal Penelitian Kimia
Published by Universitas Sebelas Maret
ISSN : 14124092     EISSN : 24434183     DOI : -
Core Subject : Science, Social, Engineering,
Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Environmental Science Materials Science & Nanotechnology
ALCHEMY Jurnal Penelitian Kimia is a chemistry journal published by Sebelas Maret University, Surakarta. ALCHEMY Jurnal Penelitian Kimia publishes original research articles or review articles in organic chemistry, inorganic chemistry, analytical chemistry, physical chemistry, biochemistry, and environmental chemistry.
Arjuna Subject : -
Articles 15 Documents
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Search results for , issue "Vol 21, No 1 (2025): March" : 15 Documents clear
Removal of Heavy Metals: Pb(II), Ni(II) And Cd(II) By Fe3O4@SiO2-TMPDT Adsorbent Prepared From Rice Husk Ash Sri Hastuti; Tri Martini; Atmanto Heru Wibowo; Dina Fitriana; Wihda Zuhara; Hesti Mutma'inah; Rima Indriyana Putri
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 1 (2025): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.1.91934.53-63

Abstract

The adsorption of Pb(II), Ni(II), and Cd(II) metal ions onto Fe3O4@SiO2-TMPDT adsorbent was carried out through batch experiments. In this study, Fe3O4@SiO2-TMPDT adsorbent was synthesized through a sol-gel process using sodium silicate extracted from rice husk ash (Na2SiO3)RHA with the addition of magnetite (Fe3O4) and modifier N1-(3-trimethoxysilylpropyl) diethylenetriamine (TMPDT). The synthesized adsorbent was then characterized by FTIR. The Fe3O4@SiO2-TMPDT adsorbent was prepared with suspension Fe3O4:(Na2SiO3)RHA ratios (v/v) of 1:4, 2:3, and 1:1, and varying the amounts of TMPDT of 1; 2.5 and 5 mL. The optimum pH to perform conditions adsorption for Pb(II) metal ions was determined to be 4, while Ni(II) and Cd(II) were 5. In addition, the adsorption process followed a pseudo-second-order kinetic model, and the adsorption isotherm was consistent with the Langmuir isotherm. The adsorption capacities for Pb(II), Ni(II), and Cd(II) were 11.760 mg/g, 1.864 mg/g, and 1.888 mg/g, respectively.
Cyclic Voltammetry Study of the Influence of Concentration of K3[Fe(CN)6] and Glucose on Glassy Carbon Electrode Adella Fajaretta Gunawan; Arie Hardian; Anceu Murniati
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 1 (2025): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.1.87604.43-52

Abstract

Biosensors are cost-effective, user-friendly devices with rapid response, sensitivity, selectivity, and stability. This study investigated the impact of K3[Fe(CN)6] concentration and glucose on glassy carbon electrode (GCE) performance. The cyclic voltammetry method determined the effects of varying K3[Fe(CN)6] and glucose concentrations on GCE. GCE characterization utilized K3[Fe(CN)6] solutions (1 – 5 mM) in 0.2 M KCl and achieved an optimum scan rate of 75 mV/s within -1.5 to 1 V vs. Ag/AgCl. Reversible Fe2+/Fe3+ redox occurred at 1mM (ipa/ipc= 0.99), with the highest reduction peak at 5mM. Glucose tests (1mM to 5mM) in 0.1 M NaOH exhibited an optimal scan rate of 200 mV/s within a potential range of -10 – 10 V at 1 mM (ipa/ipc= 1.01), with the highest oxidation peak at 5 mM. GCE effectively measured concentration effects, with ipa/ipc values close to 1, indicating reversible redox processes at low concentrations. Higher concentrations yielded stronger peak currents due to increased electroactive species.
Acrylated alkyd Resins, Synthesis, Characterization, Physico-Chemical properties for Environmentally Friendly Coating Applications Nadia Baqer Hussein; Doaa Jalil Al-Taie
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 1 (2025): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.1.96504.162-179

Abstract

This study presents the synthesis of acrylated alkyd resins derived from castor oil for environmentally-friendly coating applications. A novel approach to alkyd resin synthesis was developed and involved free-radical polymerization with acrylic monomers to enhance drying time, chemical resistance, and solubility. The method advantages controlled radical polymerization to optimize the acrylic-to-alkyd ratio and oil length, resulting in improved film properties, including higher crosslink density and faster drying rate compared to traditional methods. The study also focuses on challenges, such as the observed negative impact on certain film characteristics, which include reduced chemical resistance at high levels of acrylic modification. The limitations underscore the importance of balancing acrylic and alkyd phases to achieve optimal performance. Comprehensive physicochemical analyses, which include FTIR and 1HNMR, confirm the formation of the hybrid structure, while performance tests reveal significant advantages over conventional solvent-borne alkyds. This work establishes a foundation for advanced coating binders that combine sustainability with enhanced functionality while recognizing the need for further optimization to mitigate limitations at high modification levels.
Improved Physico-Mechanical Properties and Microstructure of Modified Kenaf Fiber Reinforced Composites Eka Marya Mistar; Muhammad Muhammad
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 1 (2025): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.1.92620.64-71

Abstract

This study examined the properties of chemically modified kenaf fiber using propionic anhydride as reinforcement in vinyl ester composites. The composites reinforced by unmodified and modified kenaf fibers were fabricated using 10, 20, 30, 40, and 50% (w/w) via a hand lay-up technique. This study’s characterization included water absorption, thickness swelling, tensile and flexural strengths, and morphological analyses. The optimum physical, mechanical, and morphological properties were observed from the composite with 40% modified kenaf fiber. The optimized composite showed a considerable enhancement in the water absorption, tensile strength, and flexural strength of 1.82%, 54.90 MPa, and 55.85 MPa, respectively. These findings were supported by the fracture morphology after the mechanical test, exhibiting an enhanced interfacial modified kenaf fiber-matrix bonding. The improved characteristics of the composite were ascribed to the impact of the modification process within the fiber-matrix structures. Modified kenaf fiber via propionylation can be applied as a reinforcement material in the vinyl ester matrix.
Studi Pembuatan Bioplastik dari Pati Tapioka dengan Pektin Kulit Buah Naga (Hylocereus polyrhizus) dan Karagenan Baiq Ayu Aprilia Mustariani; Sulistiyana Sulistiyana; Putri Riska Fauziah; Miftahur Roifah
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 1 (2025): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.1.94003.121-129

Abstract

Penelitian ini bertujuan untuk membuat bioplastik berbasis pati tapioka dengan penambahan pektin dari limbah kulit buah naga (Hylocereus polyrhizus) dan karagenan. Penambahan kedua bahan tersebut untuk meningkatkan sifat fisika dan kimia bioplastik, termasuk ketebalan, opasitas, dan densitas. Uji ketebalan menunjukkan variasi antara 0,076 hingga 0,097 mm, dengan formulasi F2 yaitu bioplastik dengan variasi perbandingan karagenan 0,7 g dan pektin kulit buah naga 0,3 g memiliki ketebalan tertinggi. Pengujian opasitas memperlihatkan bahwa penambahan pektin cenderung meningkatkan opasitas, sementara karagenan menurunkannya. Nilai opasitas berkisar antara 3,020 hingga 5,976 mm⁻¹, dengan F0 memiliki nilai tertinggi. Densitas bioplastik berkisar antara 1,345 hingga 1,897 g/cm³, di mana formulasi F2 juga menunjukkan densitas tertinggi. Perolehan analisis statistik dari pengujian ANOVA bersamaan dengan Kruskal-Wallis menunjukkan bahwa penambahan pektin dan karagenan memiliki pengaruh signifikan (p < 0,05) terhadap ketiga parameter tersebut. Penelitian ini menampakkan bahwa kombinasi pektin dan karagenan efektif dalam memperbaiki sifat fisik dan optik bioplastik, menjadikannya kandidat yang potensial untuk aplikasi kemasan berkelanjutan.Study on the Production of Bioplastic from Tapioca Starch with Dragon Fruit Peel Pectin (Hylocereus polyrhizus) and Carrageenan. This study aims to synthesize tapioca starch-based bioplastics by adding pectin from dragon fruit (Hylocereus polyrhizus), peel waste, and carrageenan. Adding both materials to improve bioplastics' physical and chemical properties, including thickness, opacity, and density. The thickness test showed a variation between 0.076 to 0.097 mm, with formulation F2 namely bioplastic with a variation in the ratio of carrageenan 0.7 g and dragon fruit skin pectin 0.3 g having the highest thickness. The opacity test showed that adding pectin tended to increase opacity, while carrageenan decreased it. The opacity values ranged from 3.020 to 5.976 mm⁻¹, with F0 having the highest value. The density of bioplastics ranged from 1.345 to 1.897 g/cm³, where formulation F2 also showed the highest density. The statistical analysis results using the ANOVA and Kruskal-Wallis tests showed that adding pectin and carrageenan significantly (p < 0.05) affected the three parameters. This study shows that the combination of pectin and carrageenan effectively improves the physical and optical properties of bioplastics, making them potential candidates for sustainable packaging applications.

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