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[en] Graphical abstract: To capture radioactive strontium from wastewater, nanorods of WO3 anchored to reduced grapheme oxide composite was prepared as absorbents. - Highlights: • RGO/WO3 nanocomposite is synthesized successfully by a facile hydrothermal method. • RGO/WO3 possesses a mesoporous 3D structure, in which WO3 is uniformly deposited on the surface of RGO. • Combining the benefits of GO and WO3, RGO/WO3 exhibit excellent adsorption ability for removal of Sr2+. • RGO/WO3 nanoadsorbent has high reusability and stability. - Abstract: A simple hydrothermal method was used to prepare 3D nanostructured composite adsorbents of reduced graphene oxide (RGO) and WO3 (RGO/WO3). The analysis results suggest that it possesses a mesoporous 3D structure, in which WO3 nanorods are uniformly loaded on the surface of the RGO. Combining the benefits of GO and WO3, the composites exhibit a higher adsorption capacity for removing Sr2+ from aqueous solutions over a wide pH range (4–11). Adsorption isotherms show that the data fit the Langmuir isotherms well (R > 0.99), and the maximum adsorption capacity of 149.56 mg g−1 was achieved, much higher than that for GO, WO3 and other similar adsorbents. Sr2+ adsorption on RGO/WO3 reached equilibrium within 200 min. The fast adsorption and high adsorption rate of RGO/WO3 are mostly attributable to the plentiful adsorption sites provided by the dispersed WO3 nanoparticles on the RGO surface. Furthermore, the existence of Na+ ions has no obvious effect on the removal of Sr2+ ions by RGO/WO3, and RGO/WO3 adsorbent can be repeated at least 5 times without significant loss of adsorption capacity by adsorption-desorption experiment. Thus, RGO/WO3 shows the potential ability for removal of 90Sr from radioactive wastewater.