Wireless sensing determination of uranium(IV) based on its inhibitory effect on a catalytic precipitation reaction |
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Authors: | Zhiyuan Zhao Lifu Liao Xilin Xiao Nan Du Yingwu Lin |
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Institution: | (1) New Star Institute of Applied Technology, No. 451 Huangshan Road, Hefei, 230031, Anhui, People’s Republic of China;(2) Radiochemistry Laboratory, Lanzhou University, Lanzhou, 73000, Gansu, People’s Republic of China |
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Abstract: | The adsorption of Eu(III) on multiwalled carbon nanotubes (MWCNTs) as a function of pH, ionic strength and solid contents
are studied by batch technique. The results indicate that the adsorption of Eu(III) on MWCNTs is strongly dependent on pH
values, dependent on ionic strength at low pH values and independent of ionic strength at high pH values. Strong surface complexation
and ion exchange contribute to the adsorption of Eu(III) on MWCNTs at low pH values, whereas surface complexation and surface
precipitation are the main adsorption mechanism of Eu(III) on MWCNTs. The desorption of adsorbed Eu(III) from MWCNTs by adding
HCl is also studied and the recycling use of MWCNTs in the removal of Eu(III) is investigated after the desorption of Eu(III)
at low pH values. The results indicate that adsorbed Eu(III) can be easily desorbed from MWCNTs at low pH values, and MWCNTs
can be repeatedly used to remove Eu(III) from aqueous solutions. MWCNTs are suitable material in the preconcentration and
solidification of radionuclides from large volumes of aqueous solutions in nuclear waste management. |
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