Abstract
Batch adsorption technique was applied to study the adsorption of radiocobalt on multiwalled carbon nanotubes (CNTs) with deferent sizes. The aim of this work was to examine the effect of contact time, pH, solid content, foreign ions and CNT particle sizes on the removal of Co(II) ions from aqueous solutions by CNTs. The results indicated that the adsorption of Co(II) was strongly dependent on pH and the adsorption capacity was in inverse proportion to the particle sizes of CNTs. The adsorption of Co(II) was weakly affected by ionic strength and foreign ions. Ion exchange and surface complexation were the main adsorption mechanisms. The kinetics of Co(II) adsorption on CNTs was described well by pseudo-second-order model. The Langmuir and Freundlich models were applied to interpret the adsorption data. The results are important to understand the physicochemical behavior of Co(II) with CNTs, and for the application of CNTs in the preconcentration of radiocobalt from large volumes of aqueous solutions.
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Financial support from National Natural Science Foundation of China (20971033) is acknowledged.
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Chen, L., Yu, S., Liu, B. et al. Removal of radiocobalt from aqueous solution by different sized carbon nanotubes. J Radioanal Nucl Chem 292, 785–791 (2012). https://doi.org/10.1007/s10967-011-1514-z
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DOI: https://doi.org/10.1007/s10967-011-1514-z