The quality and characteristics of cotton and sunflower oil bleached using clays from Iliri, in North Eastern Uganda

Mukasa-Tebandeke, I. Z.; Wasajja-Navayojo, Z.H; Schumann, Alline Mariá; Lugolobi, F.

doi:10.5958/2320-320x.2016.00003.0

Cited by 2 publications

(3 citation statements)

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“…However, the value of obtained was lower than observed in other researches [11][12]28]. The value of obtained in this work is comparable to the value reported by [13,[29][30][31] where low values of (<2) were also obtained after evaluation. This indicated that the adsorption capacity of beta carotene on ACAC was lesser when compared to other clays.…”

Section: Equilibrium Kinetic Modelling Of Palm Oil Bleaching By Acacsupporting

confidence: 81%

Adsorption of Carotene from Crude Palm Oil by Activated Achalla Clay

Ajemba

et al. 2023

JERR

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High costs of imported bleaching earths have led to the need for alternative local sources. The effectiveness of acid-activated Achalla clay in crude palm oil bleaching was examined. The clay sample was collected, sun-dried, manually ground, and activated with the hydrochloric acid solution. Characterization of the raw and activated clay samples was carried out using X-ray fluorescence (XRF), Scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy (FTIR) analyses. The factors that were varied during the bleaching process were temperature, contact time, and adsorbent dosage. The adsorption kinetics, adsorption isotherm, and thermodynamics studies were also investigated. The XRF, SEM, and FTIR characterization results showed that the clays were kaolinites with some significant increase in the number of microporous surfaces and some changes in the functional groups. The results also indicated that the process performance improved at higher temperatures. The highest bleaching efficiency of the bleaching process was 85.6%. The pseudo-first-order model described the adsorption process from the experimental data with higher correlation coefficients than the pseudo-second-order, first-order, and Intra-particle diffusion models. The equilibrium isotherm data were described better by the Temkin model than Langmuir and Freundlich models due to higher R2 values. The enthalpy and entropy values were determined to be 26,968.12 J/mol and 78.2273 J/mol respectively. The Gibb’s free energy was found to vary between -1.428.39 to 1,700.70 J/mol. The results of the thermodynamic parameters showed that it was a spontaneous chemical adsorption process and endothermic. This study has revealed that acid-activated Achalla clay can be used for the bleaching of crude palm oil at higher temperatures.

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Section: Equilibrium Kinetic Modelling Of Palm Oil Bleaching By Acacsupporting

confidence: 81%

Adsorption of Carotene from Crude Palm Oil by Activated Achalla Clay

Ajemba

et al. 2023

JERR

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“…Bleaching earths eliminate oxidation products and other impurities from oils and in this way improve the quality shelf life of the oils. It is therefore necessary to determine the quantities of peroxides that may be still present to find out if bleaching effectively eliminated oxidation products [3]. Table (2) represents the reduction in peroxide values during bleaching processes of soybean, corn and sunflower oils with three treatments; before bleaching, after bleaching with raw bleaching earth and after bleaching with nano bleaching earth.…”

Section: Peroxide Valuementioning

confidence: 99%

“…So it is essential to bleach the oils. Oxidation products in the crude vegetable oils are removed by adsorption on the active surface of the bleaching earth to improve color and stability of the final oil [3].…”

Section: Introductionmentioning

confidence: 99%

Using Nanotechnology in Bleaching Vegetable Oils

et al. 2020

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T he present study aimed to investigate the efficiency of nanotechnology in bleaching three important Egyptian oils (soybean, corn and sunflower). The raw bleaching earth powder was milled for 10 h in a planetary ball mill. X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM) were used to investigate morphology, crystallite size, lattice strain and particle size of as-received and milled powders. The mechanical alloying process succeeded to obtain nano-sized bleaching earth powders after 10 h of milling and the morphology appeared rod with 46.6 nm in length and 4.46 nm in diameter. The milled nanosized bleaching powder was used in bleaching of oils under study. Comparing color indices, peroxide values and spectral absorbencies at 232, 270 nm for the resulted bleached oils with the unbleached and control ones bleached with raw bleaching earth, it was concluded the high bleaching efficiency of nano-sized bleaching earth in reducing color indices, peroxide values and spectral absorbencies at 232, 270 nm.

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The quality and characteristics of cotton and sunflower oil bleached using clays from Iliri, in North Eastern Uganda

Cited by 2 publications

References 0 publications

Adsorption of Carotene from Crude Palm Oil by Activated Achalla Clay

Adsorption of Carotene from Crude Palm Oil by Activated Achalla Clay

Using Nanotechnology in Bleaching Vegetable Oils

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