CD Tesis

Preparasi Nanokomposit Cr-TiO2/α-Fe2O3 Berbasis Pasir Alam Logas sebagai Katalis untuk Degradasi Metilen Biru

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Methylene blue (MB) is a cationic dye widely used in the textile, paper, and plastic industries. MB is known to be toxic, carcinogenic, and mutagenic, making it a serious threat to the environment and human health if discharged into wastewater. The treatment of MB waste requires an efficient and effective method to prevent environmental pollution. One promising approach is Advanced Oxidation Processes (AOPs), such as the photo-Fenton method, which can effectively degrade the dye. Hematite (α-Fe2O3) and titanium dioxide (TiO2)-based nanocomposites are used due to their excellent photocatalytic properties, where α-Fe2O3 acts as a catalyst with high stability, while TiO2 enhances photocatalytic activity because its band gap is suitable for UV light. This combination makes the TiO2/α-Fe2O3 nanocomposite an environmentally friendly and efficient solution for MB degradation.
This study aims to prepare Cr-TiO2/α-Fe2O3 nanocomposites based on Logas natural sand with a TiO2/α-Fe2O3 ratio of 65:35 wt.%. The study also analyzes the effect of chromium addition in wt.% on the physical properties of the nanocomposites, including structure, morphology, magnetic, optic, and particle size distribution, using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Vibrating Sample Magnetometer (VSM), UV-Vis Spectroscopy, and Particle Size Analyzer (PSA). Additionally, the study evaluates its relationship with the photocatalytic performance of the nanocomposite in MB degradation.
The synthesis of Cr-TiO2/α-Fe2O3 nanocomposites shows that the structural, magnetic, morphological, optical, and particle size properties have been analyzed using XRD, SEM, VSM, , UV-Vis spectroscopy, and PSA. XRD analysis indicates that the nanocomposites have a hexagonal structure, with crystal size decreasing from 17,5 nm to 19,7 nm, 19,5 nm, and 19,4 nm for samples with chromium concentrations of 0%, 5%, 10%, and 15%, respectively. VSM shows that coercivity, saturation magnetization, and remanence magnetization are in the ranges of 131-247 Oe, 0.80-0.54 emu/g, and 0.097-0.116 emu/g, respectively. SEM analysis shows that the average particle size of BM 6A is 1,316 μm, while the products BM 6C and 6D are reduced to 1,509 μm and 0,806 μm, respectively. The addition of chromium reduces agglomeration, resulting in more uniform particles and smoother surfaces. PSA shows that the particle size distribution of BM 6 products (A, B, C, and D) is not homogeneous, with sizes at the 10%, 50%, and 90% distributions of 0,178 µm, 0,453 µm, and 0,937 µm, respectively, due to agglomeration during the ball milling process. The optical band gap decreases from 1,93 eV for the pure nanocomposite to 1,91 eV, 1,89 eV, and 1,95 eV for chromium concentrations of 5%, 10%, and 15%, respectively.


Key Words : Logas Natural Sand, Ball Milling, Cr-TiO2/α-Fe2O3, Nanocomposite

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Ketersediaan

Informasi Detail

Judul Seri

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No. Panggil

2210247850

Penerbit

Pekanbaru : Universitas Riau Pascasarjana Tesis Pendidikan Fisika., 2024

Deskripsi Fisik

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Bahasa

Indonesia

ISBN/ISSN

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Klasifikasi

2210247850

Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

FISIKA

Info Detail Spesifik

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Pernyataan Tanggungjawab

Jaka

Versi lain/terkait

Lampiran Berkas

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