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《Journal of Anhui University of Science and Technology(Natural Science)》 2014-02
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Study on the Surface Modification of CNTs and Their Adsorption of Cr( VI) from Aqueous Solution

YANG Han pei;SONG Shuang -shuang;YU Mi -hong;FU Xiao fei;WU Jun -ming;Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes,Ministry of Education,Hohai University;College of Environment,Hohai University;Huaian Research Institute of Hohai University;  
Carbon nanotubes( CNTs) were prepared by catalytic chemical vapor decomposition of benzene on Fe2Ni /γ- Al2O3at 600 ℃,the as- prepared CNTs were ultrasonically purified by oxidation with mixed acid of H2SO4and HNO3( H2SO4/HNO3,3∶1,volume ratio),embedding the active – COOH and – OH groups onto the surface of CNTs,and consecutively,the acid- treated CNTs were further modified by surface wrapping of PVA with abundant functional groups of – OH. The batch removal of hexavalent chromium( Cr( VI)) from aqueous solution by using modified CNTs was studied under ambient conditions and the effect of pH,initial concentration of Cr( VI),CNTs content,contact time on the removal of Cr( VI) was also investigated. The steady enhancement of adsorption of Cr( VI) onto CNTs along with the treatment of CNTs by mixed acid and PVA was observed. Equilibrium data were well described by the typical Freundlich adsorption isotherm and the pseudo-second- order kinetics model was well suitable to model the kinetic adsorption of Cr( VI). It is proposed that the enhanced adsorption capacity of Cr( VI) onto CNTs is correlated with the grafting of functional active groups onto the surface of CNTs and the improvement in the hydrophilic ability of modified CNTs.
【Fund】: 河海大学淮安研究院开放基金资助项目
【CateGory Index】: TQ127.11;O647.3
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