Adiyatma, Ahmad Alif (2026) Fungsionalisasi Fe₃O₄/ZnO Berbasis Limbah Korosi dengan Metode Berbantuan Ultrasound terhadap Kinerja Degradasi Fotokatalitik Methylene Blue. Other thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Pencemaran air oleh pewarna organik seperti methylene blue (MB) memerlukan solusi pengolahan yang efektif dan berkelanjutan. Penelitian ini mensintesis nanokomposit Fe3O4/ZnO menggunakan limbah korosi sebagai prekursor Fe3O4 melalui metode ko-presipitasi dibantu sonokimia dengan NH4OH 25% tanpa gas inert, dikombinasikan dengan ZnO komersial, untuk aplikasi fotodegradasi MB. Tiga variasi rasio massa Fe3O4:ZnO disintesis, yaitu FZ1 (1:1), FZ2 (1:2), dan FZ3 (1:3), pada tiga variasi dosis katalis (50, 100, dan 150 mg), diuji terhadap degradasi MB 10 ppm di bawah sinar UV 18 watt selama 60 menit setelah 15 menit adsorpsi gelap. Karakterisasi XRD menunjukkan limbah korosi mengandung magnetit (41,6%), siderit (27,7%), troilit (18,8%), dan maghemit (11,9%), dengan ukuran kristal Fe3O4 hasil sintesis sebesar 21,39 nm, meningkat pada komposit seiring bertambahnya fraksi ZnO (FZ1 26,58 nm hingga FZ3 40,86 nm). Karakterisasi VSM menunjukkan sifat ferrimagnetik dengan magnetisasi saturasi menurun dari Fe3O4 murni (42,96 emu/g) ke FZ3 (16,88 emu/g), sementara celah pita meningkat dari 2,20 eV (Fe3O4) hingga 3,06 eV (ZnO). Hasil fotodegradasi menunjukkan efisiensi tertinggi pada FZ3 dosis 150 mg (96,15%) dengan konstanta laju reaksi orde dua tertinggi (k2=0,0421 ppm⁻¹min⁻¹), sementara FZ1 menunjukkan performa terendah (89,91–92,53%). Analisis ANOVA tiga arah mengonfirmasi bahwa rasio komposisi (F=140,0959; p=7,251×10⁻¹¹) memberikan pengaruh lebih dominan dibanding dosis katalis (F=50,7349; p=1,185×10⁻⁷). Berdasarkan pertimbangan efisiensi biaya bahan baku ZnO, komposisi FZ2 dosis 50 mg direkomendasikan sebagai kondisi optimal, dengan efisiensi 95,07% dan biaya ZnO minimal. Penelitian ini menunjukkan potensi valorisasi limbah korosi sebagai prekursor fotokatalis magnetik yang dapat dipisahkan kembali menggunakan magnet eksternal.
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Water pollution by organic dyes such as methylene blue (MB) requires effective and sustainable treatment solutions. This study synthesized Fe3O4/ZnO nanocomposites using corrosion waste as the Fe3O4 precursor through sonochemically-assisted co-precipitation with 25% NH4OH without inert gas, combined with commercial ZnO, for MB photodegradation applications. Three mass ratio variations of Fe3O4:ZnO were synthesized, namely FZ1 (1:1), FZ2 (1:2), and FZ3 (1:3), at three catalyst dose variations (50, 100, and 150 mg), tested against degradation of 10 ppm MB under 18-watt UV irradiation for 60 minutes following 15 minutes of dark adsorption. XRD characterization revealed that the corrosion waste contained magnetite (41.6%), siderite (27.7%), troilite (18.8%), and maghemite (11.9%), with the synthesized Fe3O4 crystallite size of 21.39 nm, increasing in composites with rising ZnO fraction (FZ1 26.58 nm to FZ3 40.86 nm). VSM characterization confirmed ferrimagnetic behavior, with saturation magnetization decreasing from pure Fe3O4 (42.96 emu/g) to FZ3 (16.88 emu/g), while the band gap increased from 2.20 eV (Fe3O4) to 3.06 eV (ZnO). Photodegradation results showed the highest efficiency in FZ3 at 150 mg dose (96.15%) with the highest second-order rate constant (k2=0.0421 ppm⁻¹min⁻¹), while FZ1 exhibited the lowest performance (89.91–92.53%). Three-way ANOVA confirmed that composition ratio (F=140.0959; p=7.251×10⁻¹¹) exerted a more dominant influence than catalyst dose (F=50.7349; p=1.185×10⁻⁷). Considering ZnO raw material cost efficiency, the FZ2 composition at 50 mg dose is recommended as the optimal condition, achieving 95.07% efficiency with minimal ZnO cost. This study demonstrates the potential valorization of corrosion waste as a magnetically recoverable photocatalyst precursor.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Fe3O4/ZnO, limbah korosi, nanokomposit magnetik, fotodegradasi, methylene blue, Fe3O4/ZnO, corrosion waste, magnetic nanocomposite, photodegradation, methylene blue |
| Subjects: | Q Science > QC Physics > QC765 Magnetic materials Q Science > QD Chemistry > QD181.Z6 Zinc oxide Q Science > QD Chemistry > QD716 Photocatalysis. T Technology > TD Environmental technology. Sanitary engineering > TD420 Water pollution T Technology > TD Environmental technology. Sanitary engineering > TD430 Water--Purification. |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Material & Metallurgical Engineering > 28201-(S1) Undergraduate Thesis |
| Depositing User: | Ahmad Alif Adiyatma |
| Date Deposited: | 22 Jul 2026 08:49 |
| Last Modified: | 22 Jul 2026 08:49 |
| URI: | http://repository.its.ac.id/id/eprint/136345 |
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