Heavy metal sorption using thiolated oils of Elaeis guineensis and Glycine max

Okwundu, Onyeka Stanislaus; Chiama, Chinedu James; Chiama, Chimezie John; Muojama, Obiora Ebuka; Enyekwe, Chibuzor Kelvin; Okaro, Augustine; Ugwuoke, Cyril O.

doi:10.22541/au.158043196.63447581

Cited by 1 publication

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“…As a result, it was verified that thiol functionalization of CMO bestowed on the oil some heavy metal sinking potentials. Earlier reports on similar comparative extraction with oils (derived from corn, soybean, palm fruit and kernel) and their thiol-functionalized equivalents witnessed complete dormancy of unmodified (raw) oil samples [24,28].…”

Section: Performance Of Cmo In Biodiesel Productionmentioning

confidence: 90%

“…Since the discovery, only sulphur-modified canola and corn oils have been tried [23,24,27]. Based on our recent comparative study of sorption potentials of thiolated oils with different levels of fatty acid unsaturation, derived from Elaeis guineensis and Glycine max, high level of unsaturation was found desirable [28], and studies have shown CMO to be of high iodine and peroxide values [20], suggesting good candidacy of thiolated CMO as heavy metal sink in wastewater treatment application. Meanwhile, the choice of Ag as contaminant is well justified [28].…”

Section: Further Background To the Studymentioning

confidence: 99%

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The untapped industrial crop, Cucumeropsis mannii: dry oil extraction, characterization and potential use as biodiesel feedstock and heavy metal sink

Okwundu

Chiama

et al. 2021

Sustain Environ Res

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Due to the quest to meet a basic need – food, vast potentials of numerous African crops have remained unexplored. Cucumeropsis mannii, an invaluable West African melon, is cultivated for its edible proteinous oil-rich seeds. Here, we report for the first time, its potential use for biodiesel production over an uncommon heterogeneous nanocatalyst, and for wastewater treatment. An identification of the untapped species’ seed was made, for disambiguation. Oil (CMO) was expressed from the C. mannii seeds (CMS) and characterized. The CMS was found composed of 53.5% lipids, while 46.1% of the full-fat CMS flour was recovered as vegetable oil. Transesterification experiments were performed using a specially-prepared heterogeneous nanocatalyst derived from Eobania vermiculata shells, by varying successively: methanol/oil ratio, temperature, and reaction time. Maximum biodiesel (CMOME) yield of 86.2% was achieved at catalyst concentration of 5.4%, methanol to oil molar ratio of 9:1, reaction temperature of 60 °C, after 3 h of reaction. Furthermore, part of the polyunsaturated CMO was sulphur-functionalized and utilized at different dosage levels for extraction of Ag+ from 600 to 1500 ppm simulated water. The modified CMO exhibited desirable sorption properties – sinking 100% of Ag+ from 900 ppm water, after 7-h-phase-contact at 6.9 g (20 mL)− 1 dosage. Stagewise operation (multi-staging) was found capable of improving the extraction efficiency in highly concentrated wastewater. Although CMOME conformed to EN-14214 and ASTM D-6751 standards, it had low oxidation stability; making wastewater treatment a more faithful application. Regarding the crop’s food value, residual CMS cake remained edible, even with longer shelf-life (relative to the full-fat flour) – encouraging commercial flour-defattening and consequent availability of CMO for industrial applications. Lastly, it was concluded (with some relevant recommendations) that CMO has great potentials for use as biodiesel feedstock and as heavy metal removal agent.

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Section: Performance Of Cmo In Biodiesel Productionmentioning

confidence: 90%