Multi walled carbons nanotubes 1-(2-pyridylazo)-2-naphtol immobilized as a green sorbent simultaneous separation and preconcentration of trace amount of manganese and nickel ion

Recently one of substance that considered is carbon nanotubes (CNTs) that are another form of carbon. CNTs discovered in 1991 by Sumio Ijima [1]. At CNTs, carbon atoms formed at cylindrical structure, carbon atoms formation at parapet this structure are similar formation of atoms carbon at graphite layers with sp² hybrid. Then carbon atoms at parapet nano tube are regular hexagonal. Carbons nanotubes divided two types, with one graphite layer rolled are single- wall carbon nanotubes (SWCNTs) and another containing more than graphite layer concentric rolled are multi-wall carbon nano tubes (MWCNTs) [2]. In recent years, great attention has been paid to the application of nano-structure materials, especially carbon nanotubes (CNTs). In particular, there have been an increasing number of applications of CNTs in several fields of chemical analysis. 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]. In the present work we have studied the analytical potential of modified multi- walled carbon nanotubes (MMWCNTs) for green separation and preconcentration manganese and nickel ions as sorbent for solid phase extraction method. We have modified MWCNTs with 1-( 2-pyridylazo)-2-naphtol.