Abstract
Metal oxide nanotubes are believed to be promising materials with adsorption functionality for water purification due to their synergistic effect of the overall microscale morphology for easy separation and nanoscale surface characters providing enough surface active absorption sites. This work shows the synthesis of uniform hierarchical porous CeO2 nanotubes via nanowire-directed templating method and describes the adsorption behavior of CeO2 nanotubes for a typical azo dye Congo red which has resistance to oxidation and decoloration in natural conditions. Fourier transform infrared spectroscopy spectra provided the evidence that Congo red was successfully coated on the surface of CeO2 nanotubes by both bidentate-type bridge link of Ce4+ cations from sulfonate SO3 − groups and the electrostatic attraction between the protonated surface generated by oxygen vacancies and dissociated sulfonate groups. The adsorption kinetic data fitted well to the pseudo-second-order kinetic equation, whereas the Langmuir isotherm equation exhibited better correlation with the experimental data. The calculated maximum adsorption capacity from the isothermal model was 362.32 mg/g. In addition, the prepared CeO2 nanotubes exhibited good recyclability and reusability as highly efficient adsorbents for Congo red removal after regeneration. These favorable performances enable the obtained CeO2 nanotubes to be promising materials for dye removal from aqueous solution.
Graphical Abstract
CeO2 nanotubes composed of crystallized nanoparticles exhibit well adsorption ability for a typical azo dye Congo red.
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Acknowledgments
We thank National Natural Science Foundation of China (51225402, 51402008 and 51471006), Beijing Natural Science Foundation (2142008, 2154043), and Guangxi Natural Science Foundation (2014GXNSFBA118039, 2014GXNSFBB118001).
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Wu, J., Wang, J., Du, Y. et al. Adsorption mechanism and kinetics of azo dye chemicals on oxide nanotubes: a case study using porous CeO2 nanotubes. J Nanopart Res 18, 191 (2016). https://doi.org/10.1007/s11051-016-3497-8
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DOI: https://doi.org/10.1007/s11051-016-3497-8