Search results for: Philiswa Nomngongo

Authors: Kgomotso G. Mabena, Philiswa Nomngongo, Nomvano Mketo

Abstract:

This study describes the synthesis and characterization of a magnetic cellulose gold nanocomposite (MCNC@Au) for vortex-assisted dispersive magnetic solid phase microextraction (VA-d-µ-mSPE) of organosulfur compounds (OSCs) in selected liquid fuel samples followed by high-pressure liquid chromatography (HPLC) analysis. The nanocomposite was synthesized utilizing an in-situ co-precipitation approach and characterization data from FTIR, P-XRD, TGA, TEM and SEM-EDX methods validated the formation of the desired nanocomposite. The most important parameters of the suggested VA-mSPE method were examined using the 2-level half-fractional factorial design and the central composite design in order to achieve high extraction efficiency. With pH as an insignificant parameter, the multivariate optimization results demonstrated that effective extraction was achieved when 20 mg of sorbent mass, 8 minutes of extraction time, and 20 mL sample volume were used. The acquired optimal condition will be used to assess the analytical performance of the VA-d-µ-mSPE technique. The quantitative parameters, including relative standard deviation (RSD), accuracy, precision, limit of quantification (LOQ), and limit of detection (LOD), will be determined. Additionally, real fuel oil samples, including crude oil, gasoline, diesel, and kerosene, will be subjected to the optimum and validated VA-d-µ-mSPE method in order to quantitatively determine various OSCs.

Keywords: MCNC@Au, VA-d-µ-mSPE, OSCs, HPLC.

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Authors: Njabulo S. Mdlulia, Masixole Sihlahlaa, Vusimuzi Pakadea, Philiswa N Nomngongob, Nomvano Mketoa

Abstract:

The removal of Ba, Na, Ni and V metals in crude oil, gasoline, diesel and kerosine was achieved by using Fe3O4@cellulose. The Fe3O4@cellulose was synthesized by using the co-precipitation method and was then characterized using the scanning electron microscope (SEM), energy dispersive X-ray spectroscopy (EDX), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer-Emmentt-Teller (BET), zeta potential and Transmission electron microscopy (TEM). To obtain the optimum adsorption conditions, multivariate optimization tools such as a two-level full factorial and a central composite were used. The optimum conditions for the adsorptve removal of Ba, Na, Ni and V in the fuel oils were found to be 4.5, 1.5 M of HNO3, 40 minutes, 0.15 g and 0.15 g for pH, eluent concentration, extraction time, adsorbent mass and sample mass (model oil concentration). The adsorption method developed was very sensitive as it reported MLOD ranging from 0.022-1.51 µg/g while MLOQ ranged from 0.072-5.03 µg/g for metals under study. The optimum conditions were then applied to real fuel samples, which were crude oil, gasoline, kerosene and diesel.

Keywords: adsorption kinetics, F=fuel oils, isotherms, metals, thermodynamics

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