الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Carbon nanotubes (CNTs) had been synthesized using chemical oxidation method and characterized using Fourier transformer infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscope (SEM) and Raman spectroscopy to clarify their physicochemical properties.Also, MnO2 and CNTs/MnO2 nanocomposite weresynthesized and were characterized.The synthesized CNTs, MnO2and CNTs/MnO2 nanocomposite were used to study the removal of Co(II), Zn(II) and Cd(II) ionsfrom aqueous solutions using batch technique. Different parameters affecting removal process including contact time, aqueous solutions pH and initial concentration were studied. Two simplified kinetic models pseudo first-order and pseudo-second-order were applied to describe the sorption process. It was found that the present system of cobalt,zincand cadmium sorption on synthesized CNTs, MnO2 and CNTs/MnO2 nanocomposite sorbents could be described more favorably for the pseudo-second-order kinetic model. Sorption data have been interpreted in terms of both Freundlich and Langmuir isotherms.Desorption of Co(II), Zn(II) and Cd(II) ions from loaded samples was studied using different eluents and the maximum recovery is obtained using MnCl2and HCl solutions.The data suggest the possible use of carbon nanotubes for the removal of these divalent metal ions from aqueous solutions.