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Adsorption of toluene and p-xylene from aqueous solution by carbon nanotubes impregnated with pure iron and iron oxide: kinetics and isotherm study

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Document pages: 11 pages

Abstract: The adsorption properties of multi walled carbon nanotubes (CNTs) and carbon nanotubes containing iron oxide (CNTs iron oxide) for harmful toluene and p-xylene (p-xylene) in water were studied. Pure carbon nanotubes were impregnated with iron oxide nanoparticles by wet impregnation technology. Various characterization techniques, including thermogravimetric analysis, scanning electron microscopy, elemental dispersion spectroscopy, X-ray diffraction and nitrogen adsorption analysis, are used to study the thermal degradation, surface morphology, purity and surface area of materials. The batch adsorption experiment showed that the removal rate of p-Xylene by carbon nanotubes impregnated with iron oxide (90 ) was higher than that of toluene (70 ), the soaking time was 2 hours   h, and the initial concentration of pollutantsration 100 ppm, at pH 6 and shaking speed of 200 rpm at 25°C. Pseudo-second-order model provides better fitting for the toluene and p-xylene adsorption. Langmuir and Freundlich isotherm models demonstrate good fitting for the adsorption data of toluene and p-xylene.

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