TITLE:
Separation/Enrichment of Copper and Silver Using Titanium Dioxide Nanoparticles Coated with Poly-Thiophene and Their Analysis by Flame Atomic Absorption Spectrophotometry
AUTHORS:
Mohammad Behbahani, Meysam Babapour, Mostafa M. Amini, Omid Sadeghi, Akbar Bagheri, Mani Salarian, Banafsheh Rafiee
KEYWORDS:
Novel Poly-Thiophene-TiO2 Nanoparticles; Copper; Silver; Flame Atomic Absorption Spectrophotometry
JOURNAL NAME:
American Journal of Analytical Chemistry,
Vol.4 No.2,
February
26,
2013
ABSTRACT:
We report on the use
of titanium dioxide nanoparticles (NPs) coated with poly-thiophene for the
preconcentration of copper and silverions. The NPs were prepared by first
modifying the surface of TiO2 NPs with vinyl groups and then
copolymerizing them with vinyl thiophen. The resulting TiO2-polythiophene
core-shell NPs were characterized by thermogravimetry, differential thermal
analysis, scanning electron microscopy, Fourier transform infrared spectrometry
and X-ray diffraction. The experimental conditions such as pH value, adsorption
and desorption time, type, concentration and volume of the eluent, break through volume, and effect of
potentially interfering ions were optimized. The ions were then desorbed with
hydrochloric acid and determined by FAAS. The limits of detection are 0.4 and
1.2 μg·L_1 for Cu(II) and Ag(I), respectively, and recoveries and
precisions are >98.0% and