oa South African Journal of Chemistry - Functionalization of a natural biopolymer with aliphatic polyamines and its sorption properties for vanadium removal from aqueous solutions : research article
|Article Title||Functionalization of a natural biopolymer with aliphatic polyamines and its sorption properties for vanadium removal from aqueous solutions : research article|
|© Publisher:||South African Chemical Institute (SACI)|
|Journal||South African Journal of Chemistry|
|Affiliations||1 Tshwane University of Technology, 2 Tshwane University of Technology and 3 Tshwane University of Technology|
|Publication Date||Jan 2012|
|Pages||62 - 67|
|Keyword(s)||Adsorption, Functionalization, Moringa oleifera, Polyamine and Vanadium|
A low-cost natural adsorbent, Moringa oleifera, was investigated as a potential alternative for currently costly methods of removing vanadium from contaminated aqueous solutions. The unmodified bark was characterized using techniques such as N2-BET, SEM, XRD and FTIR spectroscopy, CHNS elemental determination and AA spectroscopy. Results showed a relatively small surface area, motivating surface functionalization to enhance adsorption capacity. Chemical modification was performed using four aliphatic polyamines: ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine (TETA) and tetraethylenepentamine (TEPA). The modified bark was characterized and then investigated to determine its efficiency in removing VO2+ from aqueous solutions. The bark had a mesoporous amorphous structure and was enriched with N and S groups. FTIR absorption frequencies also revealed that polyamines were indeed immobilized on the adsorbent surface. The polyamine density was calculated and was in the order of EDA>DETA>TETA>TEPA, whereas the adsorption efficiency with VO2+ was in the order DETA>EDA>TETA>TEPA. Adsorbent amination was enhanced by up to 26% and adsorption performance improved by up to 155 %. It was, therefore, concluded that chemical modification of M. oleifera using polyamines enhances adsorption of VO2+ from aqueous solutions. This can, thus, preconcentrate VO2+ in the bark leading to its use as a good water purifier.
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