Recently, 2D-MXene materials have attracted much attention. However, their low adsorption capacities for metal ions have limited their application in nuclear wastewater disposal. Here, we describe the unprecedentedly high adsorption by Ti3C2Tx for the removal of radionuclides by a simple and efficient surface modification strategy. We have produced an Alk-Ti3C2Tx material possessing desirable properties such as wide layer spacing and abundant active adsorption sites, with excellent ability to remove barium ions from aqueous solution. Maximum Ba2+ adsorption by Alk-Ti3C2Tx is 46.46 mg g-1, almost three times higher than that of unmodified Ti3C2Tx and much higher than that reported in previous studies. The remarkable selectivity for the removal of Ba2+ from simulated mixed nuclear wastewater is highly desirable for application in environmental wastewater treatment.

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Efficient and irreversible capture of radioactive nuclides is an important environmental protection task when disposing of nuclear wastewater.

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Novel core‐shell magnetic Fe3O4@WO3@GO nanocomposites were synthesized and used to remove radioactive strontium from aqueous solution. Taking advantage of the combined benefits of GO and magnetic WO3 nanoparticles, Fe3O4@WO3@GO nanocomposites exhibited excellent adsorption capability for removing Sr2+. Results for Sr2+ adsorption on Fe3O4@WO3@GO have a good fit with a Langmuir isotherm and a pseudo‐second‐order kinetic model. The maximum adsorption capacity is 61.42 mg g−1, which is higher than that of other similar adsorbents. The high adsorption capacity of Fe3O4@WO3@GO can be attributed to the good dispersion of magnetic WO3 on the surface of GO, efficiently reducing the aggregation of nanoparticles and enhancing the probability for contact between adsorbent and adsorbate. In addition, the Fe3O4@WO3@GO nanocomposites exhibited excellent reusability, after 5 uses there was no noticeable loss in adsorption capacity. Thus, this type of nanocomposite to hold excellent is promising for clean‐up of radioactive strontium from wastewater.