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Heavy metal sorption using thiolated oils of Elaeis guineensis and Glycine max
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  • Onyeka Okwundu,
  • Chinedu Chiama,
  • Chimezie Chiama,
  • Obiora Muojama,
  • Chibuzor Enyekwe,
  • Augustine Okaro,
  • Cyril Ugwuoke
Onyeka Okwundu
Nigerian Young Researchers Academy
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Chinedu Chiama
Nigerian Young Researchers Academy
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Chimezie Chiama
Nigerian Young Researchers Academy
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Obiora Muojama
Nigerian Young Researchers Academy
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Chibuzor Enyekwe
Nigerian Young Researchers Academy
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Augustine Okaro
University of Benin
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Cyril Ugwuoke
Nigerian Young Researchers Academy
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Abstract

Sulphur-modification of matter confers improved heavy metal affinity and could be exploited in the treatment of heavy metal contaminated water. This paper is aimed at comparing the selective liquid-liquid Ag+ sorption capacities of normal and thiolated: palm oil (PO), palm kernel oil (PKO) and soybean oil (SBO), respectively. The vegetable oils were modified with 1-heptanethiol and the thioether-functionalized (TF) oils were utilized for the removal of Ag+ present as contaminant in water, while the unmodified oils acted as controls. Liquid-liquid equilibrium contact time was determined to be 6 hours. The result achieved after equilibration, revealed the effectiveness of TF oils in the removal of Ag+ from a 600 ppm AgNO3 (aq). While TF-SBO reduced the cation concentration to a level less than the detection limit, TF-PKO only showed appreciable sorption capacity (below 30 %) compared to the sorption-inactive normal oils. The order of Ag+ sorption capacity (TF-SBO > TF-PO > TF-PKO) was ascribed to the various levels of unsaturation of fatty acid chains encountered in the lipids, since higher number of sorption-active TF sites is achievable with greater degree of fatty acid unsaturation. On that note, highly unsaturated vegetable oils (such as that of Glycine max) were recommended.