The Effect of Silica on Photocatalytic Degradation of Methylene Blue Using Silica-Coated NiZn Ferrite Nanoparticles

Abstract:

Nickle zinc ferrite (NiZnFe₂O₄) magnetic nanoparticle (MNPs) has been successfully synthesized using co-precipitation method. NiZnFe₂O₄ was coated SiO₂ (NiZnFe₂O₄/SiO₂) using Stöber method with various concentrations of (5%, 10%, 15%, 20%, 30%, and 50%). MNPs sample has a spinel ferrite phase confirmed by X-ray diffraction (XRD) measurements. The results of the functional group analysis performed using Fourier transform infrared (FTIR) showed an M-O tetrahedral vibrational bond found a wavelength of 347 cm^-1. After coated silica, Si-O-Si vibrational bonds appear at wavelengths of 1033.85 cm¹. Magnetic properties were measured using vibrating Sample Magnetometer (VSM), the result shows that has maximum saturation magnetization of NiZnFe₂O₄ 22.5 emu.gram^-1 and decreased to 16.9 emu.gram^-1 after coating. In figure 1 show that the photodegradation activity of MNPs was carried out with a variation of irradiation time. Result of the photodegradation activity of methylene blue shows that NiZnFe₂O₄/SiO₂ are higher than NiZnFe₂O₄. Sample of NiZnFe₂O₄/SiO₂ has the highest photodegradation rate up to 96%. The existence of SiO₂ layer on the surface of bare MNPs increases the surface reactivity of samples.

• Periodical: Key Engineering Materials (Volume 855)
• Pages: 268-273
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.855.268
• Online since: July 2020
• Authors: Nurul Imani Istiqomah, Afifah Thahirah Muzakki, Astrie Nofrianti, Edi Suharyadi*, Takeshi Kato, Satoshi Iwata
• Keywords: Coated, Co-Precipitation, Nickel Zinc Ferrite, Photodegradation, Silica, Stöber

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