Table of Contents
ISRN Nanotechnology
Volume 2013, Article ID 674289, 8 pages
http://dx.doi.org/10.1155/2013/674289
Research Article

Amino-Functionalization of Multiwall Carbon Nanotubes and Its Use for Solid Phase Extraction of Mercury Ions from Fish Sample

Department of Chemistry, Imam Khomeini International University (IKIU), P.O. Box 288, Qazvin 34149-16818, Iran

Received 11 May 2013; Accepted 7 June 2013

Academic Editors: G. Alfieri, Y. A. Koksharov, W. Mamdouh, X. Qin, Z. Shi, and H. Tang

Copyright © 2013 Majid Soleimani et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We describe here the amino-functionalization of multiwall carbon nanotubes (MWCNTs) and also its application as an adsorbent of solid phase extraction (SPE). The amino-functionalized MWCNTs have a good capacity to retain Hg2+, but the raw and purified MWCNTs are found not to adsorb Hg2+ ions. The amino-functionalized MWCNTs are prepared with amino-functionalization of purified MWCNTs by ethylenediamine. The physicochemical properties of purified and amino-functionalized MWCNTs are characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and the Boehm titration. The amino-functionalized MWCNTs are selected as novel sorbents for the solid phase extraction of Hg2+. The amino-functionalized MWCNT-SPE method is used for the determination of Hg2+ from complex matrix including fish and real water samples. Effective parameters on Hg2+ retention such as pH, flowrate, nature of the eluent, the ionic strength, selectivity coefficient, and retention capacity are investigated. The enrichment factor and maximum capacity of the sorbent are 100 mL and 11.58 mg/g, respectively. The linear range, limit of detection, and relative standard deviation of the proposed method are 0.003 to 0.3 μg/L, μg/L, and 2.23%, respectively. Selectivity experiments show that the adsorbents have a stronger specific retention for Hg2+ than Fe3+, Cu2+, Pb2+, Ni2+, Mn2+, Ca2+, and Mg2+.