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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA JURNAL ATOMIK AKM: Aksi Kepada Masyarakat
Subagyono, RR Dirgarini Julia Nurlianti
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Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Social Sciences Other

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Synthesis and Characterization of Aluminated Santa Barbara Amorphous-15 via Ultrasonic-Enhanced Hydrothermal Method: Effects of Sonication, Solvent Acidity, and Si/Al Ratio Putri, Dini Hariyanto; Subagyono, RR Dirgarini Julia Nurlianti; Allo, Veliyana Londong; Manawan, Maykel
Jurnal Kimia Sains dan Aplikasi Vol 28, No 6 (2025): Volume 28 Issue 6 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.28.6.292-298

Abstract

Aluminated Santa Barbara Amorphous-15 (Al-SBA-15) materials were successfully synthesized using an ultrasonic-enhanced hydrothermal method. The synthesis was conducted by varying the mole ratio of Si precursor and Al precursor (10 and 20), sonication time (3 and 5 hours), and solvent type (2 M hydrochloric acid (HCl) and distilled water). The resulting materials were characterized using N2 sorption analyzer, Fourier Transform Infrared Spectroscopy (FTIR), Small-Angle X-ray Diffraction (SAXRD), Scanning Electron Microscopy (SEM), and Ammonia-Temperature Programmed Desorption (NH3-TPD). FTIR spectra confirmed the presence of siloxane, silanol, and hydroxyl functional groups in all Al-SBA-15 samples. SAXRD analysis showed three characteristic peaks of SBA-15, indicating a two-dimensional hexagonal structure (p6mm). Increasing the sonication time enhanced the surface area from 718 to 767 m2/g, while reducing the pore diameter from 5.96 to 4.81 nm and the pore volume from 1.07 to 0.92 cm3/g. Raising the Si:Al molar ratio slightly increased the surface area (718 to 722 m2/g) and decreased the pore diameter and volume. Additionally, using distilled water instead of 2 M HCl as the solvent raised the surface area from 722 to 785 m2/g, while decreasing the pore diameter from 5.61 to 5.05 nm and slightly lowering the pore volume. The acidity of the Al-SBA-15 material varied according to the sonication time and the amount of Al precursor used, suggesting the potential of regulating the acidic properties through optimization of the synthesis parameters.
Preparation of Fe3O4/TiO2/ZnO Composite as a Photocatalyst for the Degradation of Methylene Blue: Optimization and Light Source Variations Wulandari, Duwi Devi; Hindryawati, Noor; Subagyono, RR Dirgarini Julia Nurlianti
Jurnal Kimia Sains dan Aplikasi Vol 28, No 7 (2025): Volume 28 Issue 7 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.28.7.374-386

Abstract

The Fe3O4/TiO2/ZnO (MTZ) composite was synthesized by preparing Fe3O4 via the coprecipitation method, TiO2 via the hydrothermal method, and ZnO via the precipitation method. The three oxides (Fe3O4, TiO2, and ZnO) were composited using the solid-state method with varying mass ratios (1:2:1, 2:1:1, 1:1:2, and 1:1:1) and calcined at 600°C for 4 h to obtain MTZ composites. The composites were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), and particle size analysis (PSA). The results indicated that the Fe3O4/TiO2/ZnO composite with a 1:1:2 ratio (MTZ3) exhibited the most favorable properties. MTZ3 was evaluated as a photocatalyst for methylene blue degradation under UV light, with variations in irradiation time, catalyst mass, and dye concentration. Further tests were conducted under sunlight and dark conditions using both the composite and its individual oxides (Fe3O4, TiO2, and ZnO). Reuse tests assessed the stability of MTZ3 after repeated cycles. Under optimum conditions (catalyst mass 0.4 g, methylene blue concentration 20 ppm, irradiation time 60 min), MTZ3 achieved 80.4% degradation under UV light. Under sunlight, degradation efficiency reached 98.7%, while under dark conditions it was only 4.5%. Reuse tests demonstrated consistent performance over three cycles, maintaining 80.4% degradation, surpassing previous studies on Fe3O4–TiO2 (1:2) composites, which achieved 67.49% degradation over two cycles. These results suggest that the MTZ3 composite is a stable and efficient photocatalyst with excellent potential for dye degradation under various light sources.
Co-Authors Al Ghazali, Muhammad Fathan Alimuddin - Allo, Veliyana Londong Chairul Saleh Claudia B. P, Chintya Zalza Laola Evi Mardiani, Evi Fadhlurrohman, Muhammad Rafi Yahya Fitria Fitria Hidayah, Amala Nur Kassim, Mohd Asyraf Manawan, Maykel Noor Hindryawati, Noor Precelia, Sari Clara Putri, Dini Hariyanto Qosim, Assyfa Machmudah RAHMAT GUNAWAN Sahirah, Nabilah Sinar Utami, Devira Ulva Wahyuni, Ade Putri Wulandari, Duwi Devi Zahra, Nadya Nur Yulia