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All Journal JURNAL KIMIA SAINS DAN APLIKASI Science and Technology Indonesia
Marita Soebrata, Betty
Department Of Chemistry, Faculty Of Mathematics And Science, IPB University, Bogor|IPB University|Indonesia
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering Environmental Science Materials Science & Nanotechnology Physics

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Synthesis and Characterization of Hydroxyapatite Composites Based on Tutut (Belamya Javanica) and Magnetite by Coprecipitation as Adsorbents of Pb Metals Ion Charlena; Nazriati; Marita Soebrata, Betty; Dicky Iswara, Muhammad
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.111-122

Abstract

Increased industrial activity can result in the emission of pollutants into the environment, such as heavy metals, which are a significant source of concern. A practical approach to reduce this problem is to utilize Pb metal adsorption. This study aims to synthesize HAp from Bellamya javanica clam shells and characterize the HAp-Fe3O4 composite as a Pb metal ion adsorbent. FTIR and XRD analysis results showed the successful fabrication of the composite, resulting in a crystal dimension of 7.63 nm and a crystallinity level of 84.80%. SEM characterization showed a porous structure with a particle size of 10.98 um. Adsorption studies of Pb(II) ions showed that the HAp-Fe3O4 composite efficiently adsorbed Pb(II) ions, with the adsorption efficiency increasing from 95.80% to 98.40%. The adsorption isothermal model of the HAp-Fe3O4 composite follows the Freundlich model with a 1/n value of 0.31 and a KF value of 25.35 L/g. The adsorption kinetics study of the HAp-Fe3O4 composite follows the pseudo second-order model with an R2 value of 1, and the thermodynamic study shows the Gibbs free energy is negative, which indicates that the adsorption process is thermodynamically optimal and spontaneous. In addition, the enthalpy value is positive, indicating that the interaction between the adsorbent and lead ions is endothermic, and the entropy is negative, indicating the reduction of random collisions of lead ions in the solid (adsorbent) and aqueous solution during adsorption.
Development of Bioplastic Films from Cassava Peel Starch Reinforced with Banana Midrib Nanocellulose and the Effect of Sorbitol on Mechanical Strength Anita Maharani Albarkah; Betty Marita Soebrata; Tetty Kemala
Jurnal Kimia Sains dan Aplikasi Vol 28, No 8 (2025): Volume 28 Issue 8 Year 2025
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.28.8.426-435

Abstract

Cassava peel and banana midrib, two abundant agricultural wastes, were utilized as sources of starch and cellulose to develop environmentally friendly bioplastic films. Cellulose was isolated through delignification and bleaching, followed by ultrasonication to produce nanocellulose. The obtained nanocellulose was characterized using Fourier Transform Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and a Particle Size Analyzer (PSA), which confirmed distinct cellulose functional groups, a crystallinity index of 58.7%, and an average particle size of 326.44 nm. Bioplastic films were prepared by blending cassava peel starch with banana midrib nanocellulose and varying concentrations of sorbitol as a plasticizer. The incorporation of nanocellulose increased thickness, density, and tensile strength, while reducing water absorption and water vapor transmission rate (WVTR), likely due to the reinforcing effect of nanocellulose within the polymer matrix. The addition of sorbitol at different concentrations influenced the mechanical properties of the bioplastics, with the composition containing 0.89 g sorbitol exhibiting favorable tensile strength and elongation. The optimal formulation consisted of 2.85 g cassava peel starch, 0.15 g nanocellulose, and 0.89 g sorbitol, yielding a tensile strength of 2.76 MPa and an elongation of 11.19%. These findings demonstrate that incorporating sorbitol and nanocellulose significantly enhances the performance of starch-based bioplastics, highlighting their potential application in sustainable packaging materials.
Co-Authors Anita Maharani Albarkah Charlena Dicky Iswara, Muhammad Nazriati Nazriati dkk. Tetty Kemala