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        Removal of sudan dyes from aqueous solution by magnetic carbon nanotubes: Equilibrium, kinetic and thermodynamic studies

        Xiaoshan Sun,Haijian Ou,Changfeng Miao,Ligang Chen 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.22 No.-

        In this study, magnetic carbon nanotubes (MCNTs) have been synthesized by hydrothermal synthesis ofFe3O4 nanoparticles onto carbon nanotubes, and characterized by Fourier transform infraredspectroscopy, transmission electron microscope and physical property measurement system. Theywere used as adsorbents for the removal of sudan I, sudan II, sudan III, and sudan IV from aqueoussolution. The effects of experimental parameters on adsorption were fully studied. The results showedthat 5 mg MCNTs can remove sudan dyes sufficiently from 20 mL aqueous solution within 60 min at pHin the range of 4–7. Moreover, the existence of NaCl favored the adsorption. The sorbents can be reusedmore than ten times with 2% acetic acid ethanol as desorption solution. The equilibrium, kinetic andthermodynamic studies were investigated. The resultant kinetic data were well described by the pseudosecond-order model. The Freundlich model fitted sudan dyes sorption isotherms better than theLangmuir model. The thermodynamic data calculated from the temperature dependent sorptionisotherms demonstrated that sudan dyes sorption on the MCNTs was a spontaneous process.

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