سال انتشار: ۱۳۸۷

محل انتشار: دومین کنگره بین المللی علوم و فناوری نانو

تعداد صفحات: ۲

نویسنده(ها):

S Ghaseminezhad – Department of Chemistry, Shahid Bahonar University of Kerman, P.O. Box 76175-133, Iran
M. A. Taher, –
D Afzali –

چکیده:

Carbon nanotubes (CNTs), are a member in the carbon family, these materials relatively are new materials that have attached great attention in recent years in several fields of chemical analysis [1]. CNTs are one of the most commonly used building blocks of nanotechnology. CNTs may be considered as sheets of graphite that are rolled into a tube and classified as single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs), depending on of carbon atom layers in the wall of the nanotubes [2]. Because of their special electronic, metallic and structural characteristics as well as the unique tubular structures of nano diameter and large length/diameter ratio, CNTs have been exploited in analytical chemistry and other fields, such as gas sensors, voltammetry, stripping voltammetry, biosensors and chromatographic applications [3]. The highly developed hydrophobic surface of CNTs exhibits strong sorption properties toward various compounds, and therefore CNTs may be used for the separation and preconcentration of trace analytes [4]. MWCNTs have also been used for the preconcentration of trace amounts of organic materials and the removal of heavy metal cations from water [5]. Often the analysis of complex materials requires a preliminary step of separation of analyte or analytes from sample matrix. Ideally, an analytical separation method should be rapid, simple, and inexpensive, give quantitative recovery of analytes without loss or degradation; should yield a solution of analyte that is sufficiently concentrated to permit the final measurement to be made without the need for concentration, and generate little or no laboratory waste that have to be disposed of [6]. For many decades the most common method for performing analytical separation on complex environmental was liquid extraction. Unfortunately, liquid extractions frequently fail to meet several of the ideal criteria listed in the previous paragraph. The use of solid phase extraction is an attractive way to avoid many difficulties associated with liquid extraction. In the solid phase extraction used various sorbents [7]. However, there were no references to the application of MWCNTs for the preconcentration of trace amounts of Rh3+. The goal of this study is to modify MWCNTs the performances of MWCNTs are tested as a new sorbent for the preconcentration of trace amounts of Rh3+ ion