MULTIWALLED CARBON NANOTUBES (MMWCNTS) MODIFED WITH 4-(4-ISOPROPYLBENZYLIDENEAMINO)THIOPHENOL. AS EFFICIENT ADSORBENT FOR SOLID PHASE EXTRACTION AND PRECONCENTRATION OF SOME METAL IONS IN ENVIRONMENTAL AND FOOD SAMPLES

作者：Mortazavi Kianoush; Ghaedi Mehrorang^*; Montazerozohori Morteza; Roosta Mostafa

来源：Fresenius Environmental Bulletin, 2011, 20(11): 2847-2854.

• 4-(4-isopropylbenzylideneamino) thiophenol
• solid phase extraction
• heavy metal ions
• flame atomic absorption spectrometry

The present article reports on the application of modified multi-walled carbon nanotubes (MWCNTs) as a new stable solid sorbent for simultaneous separation and preconcentration of some metal ions including Cd(2+), Ni(2+), Pb(2+) and Zn(2+) ions from various real samples prior to their measurements by flame atomic absorption spectrometry (FAAS). The proposed method is based on utilization of oxidized multiwalled carbon nanotubes modified with 4-(4-isopropylbenzylideneamino)thiophenol (4,4-IPBATP). Following the optimization of variables, such as pH, amount of ligand and MWCNTs, and condition of eluent, the pro-poosed method is suitable for simultaneous preconcentration and determination of under study metal ions with recoveries in the range of 97.6-99.5% and relative standard deviations between 1.0-2.3. At pH 6.0, the maximum adsorption capacity of Cd(2+), Ni(2+), Pb(2+) and Zn(2+) ions onto the MWCNTs -4,4-IPBATP in batch method was higher than 33.6 mg g(-1) after 1-h contact time. The detection limits (3SD(b)/m, n=10) of Cd(2+), Ni(2+), Pb(2+) and Zn(2+) ions were 1.6, 2.4, 5.6 and 1.3 ng mL(-1). Enrichment of under study metal ions from 1750 ml to 5 ml allows achieving a preconcentration factor of 178. The proposed procedure successfully has been applied for the evaluation of under study metal ions of various real samples.

• 出版日期2011