Pre-concentration of toxic metals using electrospun amino-functionalized nylon-6 nanofibre sorbent

Darko, G. and Sobola, A. and Adewuyi, S. and Okonkwo, J.O. and Torto, N. (2012) Pre-concentration of toxic metals using electrospun amino-functionalized nylon-6 nanofibre sorbent. South African Journal of Chemistry, 65 . pp. 14-29. ISSN 0379-4350

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Abstract

This paper presents a new approach for pre-concentrating toxic metals (As, Cd, Ni and Pb) in aqueous environments using an amino-functionalized electrospun nanofibre sorbent. The sorbent, composed of nanofibres of average diameter 80 ± 10 nm and specific surface area of 58m2 g–1, exhibited fast adsorption kinetics (<20 min) for As, Cd, Ni and Pb. The optimalpHfor the uptake of As, Cd, Ni and Pb were 5.5, 6.0, 6.5 and 11, respectively. The adsorption process best fitted the Freundlich isothermand followed the first-order kinetics. The highest pre-concentration achieved using the sorbent was 41.99 (Ni in treated wastewater). The capacity of the sorbent to pre-concentrate the toxic metals was compared with those of aqua regia and HNO3+H2O2 digestions. The pre-concentration factors achieved for Cd in river water samples can be ranked as aqua regia digestion (0.73) > adsorption (0.34)>HNO3+H2O2 (0.23) digestion.Asimilar trend was observed for Ni in river water as well as Ni andCdin tap water samples. Pb ions in the river water samples were pre-concentrated slightly better using the two digestion methods pre-concentration factors ~22) compared to adsorption method (pre-concentration factor ~21). The use of the electrospun amino-functionalized nanofibre sorbent presentsanefficientand cost-effective alternative for pre-concentration of toxic metals inaqueousenvironments.

Item Type:Article
Additional Information:Research article: Submitted by invitation to celebrate 2011 the ‘International Year of Chemistry’.
Uncontrolled Keywords:electrospinning, pre-concentration, heavy metals, nylon-6
Subjects:Q Science > QD Chemistry
Divisions:Faculty > Faculty of Science > Chemistry
ID Code:3475
Deposited By: Mrs Eileen Shepherd
Deposited On:21 Sep 2012 15:26
Last Modified:21 Sep 2012 15:26
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