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All Journal Journal of Mathematical and Fundamental Sciences Chemistry Indonesian Journal of Chemical Research Jurnal Riset Sains dan Kimia Terapan
Fainan Failamani
Inorganic And Physical Chemistry Research Division, Faculty Of Mathematics And Natural Sciences, Bandung Institute Of Technology, Jl. Ganesha 10, Bandung, 40132, Indonesia.
Astronomy Biochemistry, Genetics & Molecular Biology Chemistry Earth & Planetary Sciences Engineering Environmental Science Mathematics Physics

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Structural and Photoluminescence Properties of Ca2+-Substituted Self-Activated Photoluminescence Material of Na2TiSiO5 Dzaky Dian Ruhimat; Fainan Failamani; Bambang Prijamboedi
Journal of Mathematical and Fundamental Sciences Vol. 55 No. 2 (2023)
Publisher : Directorate for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.5614/j.math.fund.sci.2023.55.2.6

Abstract

The effects of Ca2+ substitution on the structural and optical properties of Na2TiSiO5 were studied. It was expected that the Ca2+ ions would replace Na+ ions and change the coordination of Ti4+-O2- as a luminescence center. Na2(1‑x)CaxTiSiO5 (x = 0.00, 0.50, 1.00) samples were synthesized using the solid-state method, and their structural properties, the local Ti4+-O2- coordination, the absorption spectra, and the photoluminescence properties were studied. The electronic structure of Na2(1-x)CaxTiSiO5 with x = 0.00 and 1.00 was also calculated using the Full Potential Linear Augmented Plane Wave (FP-LAPW) method to explain some of the observed properties. The Ca2+ substitution resulted in a phase transformation from an orthorhombic to a monoclinic structure. The number of TiO6 octahedra increased with the increase of Ca2+ and correlated with the decrease of PL emission intensity of the Na2(1‑x)CaxTiSiO5 samples. The Ti-3d bands in the CaTiSiO5 were more dispersive than in the Na2TiSiO5 and were responsible for the PL emission intensity reduction.
From Zircon Sand to Advanced Functional Materials: Synthesis and Characterization of Zirconium-Based Metal Organic Frameworks Palapessy, Berryl Vendo; Reda, Brilyan Muhammad Rasyid; Failamani, Fainan; Patah, Aep
Indonesian Journal of Chemical Research Vol 13 No 2 (2025): Edition for September 2025
Publisher : Jurusan Kimia, Fakultas Sains dan Teknologi, Universitas Pattimura

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30598/ijcr.2025.13-ber

Abstract

This study presents an integrated approach for converting zircon sand into functional materials based on zirconium metal–organic frameworks (Zr-MOFs). Zirconium was extracted through three main steps: alkali fusion, water leaching, and nitric acid leaching, resulting in a precursor identified as Zr(OH)2(NO3)2·1.33H2O (ZON). Characterization using XRF, FTIR, XRD, and SEM-EDX revealed that ZON possesses a high zirconium content (94.87% relative to the total metal content) and distinct structural features. The ZON compound was subsequently utilized as a novel precursor in synthesizing of three types of Zr-MOFs: UiO-66, MOFs-801, and MOFs-808. Structural and morphological analyses indicated that all three MOFs were successfully formed with high crystallinity. These findings demonstrate that locally sourced zircon sand has strong potential as a sustainable and cost-effective raw material for MOF synthesis, while also bridging the knowledge gap between zirconium extraction and the development of sustainable materials chemistry based on local mineral resources.
Analytical Investigation of Oleic Acid Double Bond Cleavage Using Cu-BiVO4 Photocatalyst in Water/Ethanol System Using GC-MS Analysis Annisa Aulia Rahmah; Bambang Prijamboedi; Fainan Failamani
Jurnal Riset Sains dan Kimia Terapan Vol. 12 No. 1 (2026): Jurnal Riset Sains dan Kimia Terapan, Volume 12 Nomor 1, Juni 2026
Publisher : Program Studi Kimia Universitas Negeri Jakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.21009/JRSKT.121.02

Abstract

The oxidative cleavage of unsaturated fatty acids is a promising pathway for producing value-added chemicals; however, its photocatalytic conversion remains limited by catalyst efficiency. This study investigates the performance of BiVO₄ and Cu-modified BiVO₄ (Cu–BiVO₄) in promoting the photocatalytic cleavage of oleic acid in a water–ethanol system under visible light irradiation. The catalysts were synthesized via hydrothermal and impregnation methods, followed by photocatalytic reactions for 24 h. Product distribution and transformation pathways were analyzed using GC–MS. The results show that pristine BiVO₄ exhibits limited catalytic activity, while Cu–BiVO₄ significantly enhances the formation of C14 and C16 saturated fatty acids along with various oxidative cleavage products. This improvement is attributed to enhanced charge separation and increased generation of reactive oxygen species. These findings demonstrate that Cu–BiVO₄ is a more effective photocatalyst for the oxidative transformation of unsaturated fatty acids.
Co-Authors Aep Patah Annisa Aulia Rahmah Bambang Prijamboedi Dzaky Dian Ruhimat Palapessy, Berryl Vendo Reda, Brilyan Muhammad Rasyid