In-situ N-doped mesoporous black TiO₂ photocatalyst is fabricated by a facile sol-gel method combined with an in-situ solid-state chemical reduction technique, using urea as nitrogen resource. The N-doped mesoporous black TiO₂ possesses high surface area of 96 m² g^-1, large pore size of 5.4 nm and narrow band gap of 2.05 eV. Meanwhile, the optical absorption extends to visible light region because of Ti³⁺ and N co-doping. The N-doped mesoporous black TiO₂ exhibits higher photocatalytic activity than that of others under visible light irradiation for photocatalytic degradation of methyl orange (MO) and rhodamine B (RhB), which is up to 93.27% and 93.64%, respectively. The enhancement is ascribed to the synergistic effect of the N and Ti³⁺ co-doping extending the visible light absorption, the separation efficiency of photogenerated charge carriers, and the mesoporous structure with large surface area offering more surface active sites, which is beneficial for improving the photocatalytic activity.

以尿素为氮源，通过简便的溶胶-凝胶法结合原位固态化学还原技术制备了原位N掺杂中孔黑色TiO ₂光催化剂。N掺杂的中孔黑色TiO ₂具有96 m ² g ^-1的高表面积，5.4 nm的大孔径和2.05 eV的窄带隙。同时，由于Ti ³⁺和N的共掺杂，光吸收扩展到可见光区域。N掺杂的介孔黑色TiO ₂在可见光照射下对甲基橙（MO）和若丹明B（RhB）的光催化降解具有比其他方法更高的光催化活性，分别高达93.27％和93.64％。增强归因于N和Ti ³⁺共掺杂的协同效应，扩展了可见光吸收，光生电荷载流子的分离效率以及大表面积的介孔结构提供了更多的表面活性位，这对提高光催化活性。