Sintesis Komposit ZnO/Fe2O3 Berbasis MIL-100(Fe) serta Kinerjanya sebagai Adsorben dan Fotokatalis Malachite Green dalam Air

Kulsum, Ummu (2024) Sintesis Komposit ZnO/Fe2O3 Berbasis MIL-100(Fe) serta Kinerjanya sebagai Adsorben dan Fotokatalis Malachite Green dalam Air. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pada penelitian ini, Fe2O3 dan ZnO/Fe2O3 berpori dengan variasi penambahan ZnO QDs sebanyak 12,5; 25; dan 50% telah berhasil disintesis melalui metode kalsinasi dalam atmosfer udara pada suhu 600 °C selama 2 jam menggunakan template MIL-100(Fe) dan ZnO/MIL-100(Fe). Pola difraktogram dan spektra FTIR material hasil sintesis menunjukkan puncak khas pada 2θ dan serapan khas yang sesuai dengan referensi. Morfologi permukaan material hasil sintesis mengalami perubahan setelah penambahan ZnO QDs dan proses kalsinasi, dengan hasil TGA yang mengkonfirmasi suhu yang digunakan untuk proses kalsinasi yaitu di atas 590 °C. Hasil UV-Vis DRS menunjukkan bahwa material ZnO/Fe2O3 optimum memiliki nilai celah pita sebesar 2,38 eV, lebih rendah daripada ZnO dan lebih tinggi daripada Fe2O3. Material hasil sintesis diuji aktivitasnya sebagai adsorben dan fotokatalis pewarna malachite green dalam air. Hasil uji menunjukkan bahwa semua material hasil sintesis mengikuti model kinetika adsorpsi orde dua semu dan isotermal Langmuir dengan nilai kapasitas adsorpsi maksimum sebesar 526 mg/g, yang dimiliki oleh ZnO(25)/Fe2O3. Selain itu, hasil kinerja fotokatalitik material heterojunction menunjukkan efisiensi degradasi sebesar 99% untuk dosis 20 mg ZnO(25)/Fe2O3 dalam 30 mL larutan MG 80 mg/L selama 60 menit. Hasil ini mengkonfirmasi keberhasilan penggabungan dua semikonduktor (Fe2O3 dan ZnO) dalam membentuk sistem heterojunction yang dapat meningkatkan efisiensi fotokatalitik.
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In this study, Fe2O3 and ZnO/Fe2O3, with different amount of ZnO QDs (12.5; 25; and 50%) were successfully synthesized by calcination method in the air atmosphere at 600 °C for 2 hours using MIL-100(Fe) and ZNO/MIL-100 templates. The diffraction pattern and the FTIR spectra of the synthesized material showed a typical peak at 2θ and the typical absorption corresponding to the reference. The addition of ZnO QDs and the calcination process changed the shape of synthesized materials's surface morfology. TGA results showed that the calcination process took place at a temperature above 590 °C. The UV-Vis DRS showed that the optimal ZnO/Fe2O3 has a band gap value of 2.38 eV, lower than ZnO and higher than Fe2O3. The synthesized material was tested for its activity as an adsorbent and photocatalyst for malachite green in water. The test results showed that all synthesized materials fitted well with pseudo-second-order kinetic model and Langmuir isotherm model, with the highest adsorption capacity of 526 mg/g by ZnO(25)/Fe2O3. The photocatalytic performance of heterojunction material showed that 20 mg of 30 mL of 80 mg/L of MG solution degraded 99% of the MG solution in 60 minutes. These results confirmed that the combination of two semiconductors (Fe2O3 and ZnO) in heterojunction systems can enhance the photocatalytic efficiency.

Item Type:	Thesis (Masters)
Uncontrolled Keywords:	adsorption, porous Fe2O3, MIL-100(Fe), ZnO quantum dot, heterojunction, photocatalysis, adsorpsi, Fe2O3 berpori, fotokatalisis, MIL-100(Fe), heterojunction, ZnO kuantum dot
Subjects:	Q Science > QC Physics > QC451 Spectroscopy Q Science > QD Chemistry > QD1 Oxidation-reduction reaction. Q Science > QD Chemistry > QD117.S64 Spectrophotometry Q Science > QD Chemistry > QD181.Z6 Zinc oxide Q Science > QD Chemistry > QD501 Catalysis. Catalysts. Q Science > QD Chemistry > QD502 Chemical kinetics Q Science > QD Chemistry > QD547 Flocculation, precipitation, adsorption, etc. Q Science > QD Chemistry > QD716 Photocatalysis.
Divisions:	Faculty of Science and Data Analytics (SCIENTICS) > Chemistry > 47101-(S2) Master Thesis
Depositing User:	Ummu Kulsum
Date Deposited:	09 Aug 2024 06:05
Last Modified:	09 Aug 2024 06:05
URI:	http://repository.its.ac.id/id/eprint/113006

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