A new technique for extraction of metal ions in water samples,
combination of multiwalled carbon nanotubes and polypropylene
hollow fiber as a solid-liquid microextraction technique
Eshaghi, Z., Farzin, F., Ahmadpour, A., Ahmadi Golsefidi, M., Ghasemi, E., Saify, A.,
and Tanha, A.K.
A novel, simple, cost-effective, and sensitive method was developed for the
determination of metal ions in water samples using multi-walled carbon Nanotubes as
solid-phase adsorbents coupled with hollow fiber liquid phase microextraction. In this
research a simple microextraction method was applied for the pre-concentration and
extraction of metal ions from water samples. We used of octanol, as a liquid phase, and
multi-walled carbon Nanotubes (MWCNTs) as the solid phase which both were
impregnated into the pores of polypropylene hollow fiber as a solid/liquid
microextraction device for extraction of metal ions from water samples. For optimization
of the method different parameters such as; kind of organic extractor solvent, extraction
time, agitation speed and pH were monitored and controlled. The effect of oxidation on
the structural integrity of multiwalled carbon nanotubes through different agents has been
studied. For these purpose, multiwalled carbon Nanotubes (MWCNTs) were
functionalized by different agents like; nitric acid, citric acid and KMnO4 (PP) solutions.
Here also the functionalized MWCNTs were sonicated in octanol and then injected into
the porous hollow fiber tube. The method was evaluated and finally applied to waste
water sample and results were obtained. All microextraction experiments were carried out
at room temperature, 25oC.