2D/2D heterojunction of Ti₃C₂/porous few-layer g-C₃N₄ nanosheets for high-efficiency extraction of uranium (VI)

Photocatalytic reduction towards hexavalent uranium has been considered as one of the most promising strategies for uranium extraction from seawater because of its good selectivity, high efficiency and environment friendliness. Of metal-free photocatalysts, graphitic carbon nitride (g-C₃N₄) is an attractive candidate. However, its practical application has been limited due to the low photogenerated electron-hole pair separation efficiency and poor electronic conductivity. In this respect, porous few-layer C₃N₄ (PFC) was prepared by a simple bottom-up method, and its combination with Ti₃C₂ via electrostatic assembly constructed a 2D/2D heterojunction structure, marked as TFC. The TFC composite exhibit remarkable uranium extraction performance, which is 4.9 times higher than bulk C₃N₄. Moreover, the sample bears good selectivity and stability. The simple preparation process and excellent uranium extraction capability make TFC-3 composite has a promising application prospect for uranium extraction from seawater.