Adsorption of Eu(Ⅲ) on Alkalized Ti3C2Tx MXene Studied by Batch Experiment and Its Mechanism Investigation
(2.Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China 100049)
【Abstract】In order to rapidly remove Eu(Ⅲ) from aqueous solution, alkalized two-dimensional titanium carbide, Na-Ti3C2Tx, was successfully prepared by treating inorganic two-dimensional transition metal carbide (MXene) with NaOH. The adsorption behavior of Eu(Ⅲ) on Na-Ti3C2Tx was systematically investigated by batch experiments. The results showed that the adsorption process was greatly affected by the pH and ionic strength of the solution, and reached equilibrium within 5 min. Based on Langmuir model fitting results, the maximum adsorption capacity of Eu(Ⅲ) on Na-Ti3C2Tx was calculated to be 54.05 mg/g at pH 4.0 and 298 K. The thermodynamic results suggested that the adsorption process was a spontaneous and endothermic reaction. The adsorption mechanism was further analyzed by energy dispersive X-ray spectroscopy (EDS), powder X-ray diffraction (XRD) and extended X-ray absorption fine structure spectroscopy (EXAFS). These data revealed that Na+ ions inside MXene galleries were exchanged by Eu3+ ions and Eu(Ⅲ) existed dominantly in outer-sphere surface complexation after adsorption under acidic pH conditions, but in inner-sphere surface complexation under near-neutral pH conditions. Due to its cost-effective preparation and excellent adsorption performance, Na-Ti3C2Tx may be a promising candidate for the efficient removal of trivalent minor actinides and lanthanides from radioactive wastewater.
【Keywords】 Na-Ti3C2Tx; Eu(Ⅲ); removal; interaction mechanism;
(Translated by KANG GD)
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