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Berlian Sitorus
Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Tanjungpura, Pontianak, West Kalimantan|Universitas Tanjungpura|Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Engineering

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Optical Properties Characterization of TiO₂-Metakaolin Composites Synthesized by the Sol-Gel Method Berlian Sitorus; Felicia Silaban; Anthoni B. Aritonang
Jurnal Kimia Sains dan Aplikasi Vol 28, No 2 (2025): Volume 28 Issue 2 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.28.2.62-67

Abstract

Titanium dioxide (TiO2) is a semiconductor known for its excellent optical properties and is widely used in various applications. In this study, TiO2-Metakaolin composites were synthesized to investigate the optical properties of TiO2-Metakaolin in comparison to pure TiO2. The synthesis was conducted using the sol-gel method, with metakaolin concentrations varied at 0.5%, 1%, and 1.5% (w/v), based on the volume of the Ti(OH)n sol. XRF analysis revealed that the composite primarily consists of SiO2, TiO2, and Al2O3. XRD results confirmed that the synthesized TiO2 is in the anatase phase, while kaolin transformed from crystalline to amorphous metakaolin. FTIR analysis identified absorption peaks at wave numbers 3410–3448 cm-1 (OH), 2364–2357 cm-1 (OH), 1624–1633 cm-1 (Ti-OH), 1070–1072 cm-1 (Si-O-Si), 800–823 cm-1 (Ti-O), 547–555 cm-1 (Si-O or Al-O), and 464–480 cm-1 (Ti-O-Ti), indicating interactions between TiO2 and metakaolin. DRS-UV characterization showed that the band gap energies of the TiO2-metakaolin composites with metakaolin concentrations of 0.5%, 1%, and 1.5% (w/v) were 3.06 eV, 3.05 eV, and 3.11 eV, respectively. These values are lower than the band gap energy of pure TiO2 (3.18 eV), demonstrating that metakaolin effectively reduces the band gap energy of TiO2.
Synthesis and Characterization of Hematite (α-Fe₂O₃) Nanomaterials from Red Mud Using EDTA as Capping Agent Berlian Sitorus; Yunior Arta Arga Manulang; Risya Sasri; Seno D. Panjaitan
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.28.8.463-470

Abstract

Hematite (α-Fe2O3) nanomaterials, a stable phase of iron oxide, hold significant potential for diverse materials science and technology applications. In this study, red mud was employed as a low-cost precursor for synthesizing hematite nanomaterials, with ethylenediaminetetraacetic acid (EDTA) used as a capping agent to prevent particle agglomeration. The effect of EDTA on particle size and colloidal stability was investigated by comparing three synthesis variations: (a) without EDTA (NPH-1), (b) with EDTA via the precipitation method (NPH-2), and (c) with EDTA via the hydrothermal method (NPH-3). XRD analysis confirmed the formation of crystalline hematite (α-Fe2O3) in all samples. FT-IR spectroscopy revealed absorption bands at 1624 cm−1 and 1382 cm−1, corresponding to the symmetric and asymmetric stretching vibrations of the carboxylate (COO−) group, respectively. The difference in these wavenumbers suggests monodentate coordination between the carboxyl groups of EDTA and the hematite nanoparticle surfaces. Particle size analysis indicated that the EDTA-assisted synthesis via precipitation (NPH-2) produced the smallest average particle size (149.6 nm) with a narrow size distribution, as reflected by a polydispersity index (PDI) of 0.43. Furthermore, this sample demonstrated enhanced colloidal stability with a zeta potential of −34.0 mV. These findings suggest that the synthesized α-Fe2O3 nanomaterials produced with narrow particle size distribution and high colloidal stability, are promising for visible-light photocatalysis.
Co-Authors Anthoni B. Aritonang Felicia Silaban Risya Sasri Seno D. Panjaitan Yunior Arta Arga Manulang