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Comparative study on adsorption of hexavalent chromium from aqueous solution by raw carbon nanotubes and metal oxide impregnated carbon nanotubes

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Document pages: 10 pages

Abstract: Adsorption of hexavalent chromium (carbon nanotubes) and hexavalent chromium (carbon nanotubes) in aqueous solution. Using wet impregnation technology, unprocessed carbon nanotubes were impregnated with 1 and 10 load (weight ) iron oxide and alumina nanoparticles. The synthetic materials were characterized by scanning electron microscopy (SEM) and thermogravimetric analysis (TGA). Batch adsorption experiments were carried out to evaluate the efficiency of removing Cr (VI) ions from water, and the effects of pH value, contact time, amount of adsorbent and initial concentration of Cr (VI) ions were investigated. The results show that the removal efficiency of Cr (VI) I is significantly improved by impregnating carbon nanotubesns compared to raw CNTs. In fact, both CNTs impregnated with 10 loading of iron and aluminum oxides were able to remove up to 100 of Cr(VI) ions from aqueous solution. Isotherm studies were carried out using Langmuir and Freundlich isotherm models. Adsorption kinetics of Cr(VI) ions from water was found to be well described by the pseudo-second-order model. The results suggest that metallic oxide impregnated CNTs have very good potential application in the removal of Cr(VI) ions from water resulting in better environmental protection.

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