CD Tesis

preparasi dan aplikasi nanokomposit Α-fE2o3/tIo2berbasis pasir alam logas untuk degradasi methylene blue

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The α-Fe2O3/TiO2 nanocomposite based on natural Logas sand was prepared using a 4-stage ball milling method for 200 hours to produce a photocatalyst for degrading methylene blue via the photo-Fenton AOP technique. This nanocomposite was prepared to address the limitations of its individual components, the high charge recombination in hematite (α-Fe2O3) and the wide band gap in titanium dioxide (TiO2). By combining both oxides, the synergistic effect of the two can enhance photocatalytic performance.
This study examined how different milling times affect the physical properties of the nanocomposite and its efficiency in degrading methylene blue. The nanocomposite shows a hexagonal hematite structure, with a crystallite size decreasing from 57,09 nm to 51,14 nm. The average particle size also decreased from 432,02 nm to 169,37 nm. XRD and SEM data confirm that the particles consist of two or more crystallites. The nanocomposite demonstrates weak ferromagnetic properties; the coercivity and remanence of the BM 4 product decrease, which is due to the reduction in particle size to the nanoscale. The BM 1 and 2 nanocomposite products have a homogeneous distribution, while BM 3 and 4 are inhomogeneous. The average nanocomposite size from the PSA test increased, indicating agglomeration caused by the increased surface area. The band gap energy increased from 2,09 eV to 2,13 eV, consistent with the quantum confinement effect, where a decrease in particle size leads to an increase in band gap energy. As milling time increases, the percentage of α-Fe2O3 and TiO2 in the sample rises, while SiO2 decreases.
In the catalytic performance test, the BM 4 product showed the highest methylene blue degradation efficiency (94,74%) compared to other ball-milled products, due to having the highest surface area and the highest percentage of α-Fe2O3 and TiO2. The BM 4 catalyst showed good reusability and stability, keeping its efficiency over three cycles. A control experiment using pure α-Fe2O3 confirmed that the observed photocatalytic activity originates from the synergy within the nanocomposite, not from α-Fe2O3 alone. The test varying the catalyst mass did not yield a significant increase in degradation efficiency.
This research demonstrates that Logas's natural sand can be effectively processed into a high-performance nanocomposite photocatalyst for breaking down methylene blue, showing good stability of reusability. The photocatalyst exhibits a reduction in crystallite and particle size, with a band gap energy suitable for visible light; this combination improves the efficiency of methylene blue degradation. Producing photocatalysts from this natural sand can be used in wastewater treatment, boosting the economic potential of the local area through the use of natural resources.
Key Word: Logas Natural Sand, Ball Milling, α-Fe2O3/TiO2 Nanocomposite, Photocatalyst, Photo-Fenton, Methylene Blue

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

2310246463

Penerbit

Pekanbaru : UNRI – PASCA – Magister Fisika., 2025

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

2310246463

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

Magister Fisika

Info Detail Spesifik

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Pernyataan Tanggungjawab

Rahmat

Versi lain/terkait

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