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2019

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vol. 17 /

Issue 3

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Olusola S. Amodu, Tunde V. Ojumu, Seteno K. Ntwampe, Olushola S. Ayanda
«Utilisation of Fly Ash and Magnetite for the Synthesis of Biosurfactant-Modified Magnetic Zeolites by Direct Alkali Fusion»
439–452 (2019)

PACS numbers: 68.37.Hk, 68.43.Mn, 68.43.Nr, 78.30.Hv, 81.70.Pg, 82.33.Jx, 82.75.-z

This work presents the synthesis of zeolite (Z), magnetic zeolite (MZ) and biosurfactant-modified magnetic zeolite (BMMZ) by direct fusion of sodium hydroxide, coal fly ash, and magnetite. The precursors and the synthesised zeolites were characterised by scanning electron microscopy (SEM) equipped with an energy dispersive spectroscopy (EDS), thermogravimetric analysis (TGA), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Brunauer, Emmett and Teller (BET) surface area analyser. The SEM analysis of Z and BMMZ showed the presence of distinct nanocube structures, while the MZ showed aggregated irregular surfaces with crevices at the surface. XRD indicated that the fly ash consists of sillimanite, quartz and mullite, the sodalite in Z, MZ and BMMZ as indicative of NaOH used in the preparation of the zeolites. The EDS analysis based on the Si/Al classification showed that zeolite X was produced. The functional group signified asymmetric and symmetric stretching vibrations of O–H and internal tetrahedron vibrations of Si–O and Al–O. The modification of the surface of Z with biosurfactant increased the BET surface area by 56.2% in comparison to the unmodified Z. Therefore, the synthesised Z, MZ and BMMZ would be effective for the removal of organic contaminants, owing to excellent and improved properties.

Keywords: adsorbent, biosurfactant-modified zeolite, characterisation, magnetite, nanoparticles

https://doi.org/10.15407/nnn.17.03.439

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This article is licensed under the Creative Commons Attribution-NoDerivatives 4.0 International License
© NANOSISTEMI, NANOMATERIALI, NANOTEHNOLOGII G. V. Kurdyumov Institute for Metal Physics of the National Academy of Sciences of Ukraine, 2019
© Olusola S. Amodu, Tunde V. Ojumu, Seteno K. Ntwampe, Olushola S. Ayanda, 2019
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