Ti³⁺ self-doped TiO₂/g-C₃N₄ mesostructured nanosheets heterojunctions (Ti³⁺-TiO₂/Meso-g-C₃N₄) have been prepared via calcination-sonication assisted method using amino cyanamide as precursors, combined with a solid-state chemical reduction method. The Ti³⁺-TiO₂/Meso-g-C₃N₄ heterojunctions with narrow band gap of ∼2.21 eV possess relative high surface area of ∼73.8 m² g⁻¹, and large pore size of ∼10 nm. Remarkably, the Ti³⁺-TiO₂/Meso-g-C₃N₄ heterojunctions exhibit excellent visible-light-driven photocatalytic activity for degradating phenol in wastewaters. The photocatalytic hydrogen production rate of Ti³⁺-TiO₂/Meso-g-C₃N₄ heterojunctions rise to ∼290.2 μmol h⁻¹ g⁻¹, which is about 4 and 14 times higher than that of the bare Meso-g-C₃N₄ and TiO₂, respectively. The enhanced photocatalytic activity may be ascribed to the synergetic effect of the mesoporous structure providing sufficient surface active sites, and Ti³⁺ self-doping and the formed heterojunctions promoting the spatial separation of photogenerated electron-hole pairs.

以氨基氰酰胺为前驱体，通过煅烧-超声辅助法制备了Ti ³⁺自掺杂TiO ₂ / gC ₃ N ₄介孔纳米片异质结（Ti ³⁺ -TiO ₂ / Meso-gC ₃ N ₄）。态化学还原法。带隙窄至约2.21eV的Ti ³⁺ -TiO ₂ / Meso-gC ₃ N ₄异质结具有约73.8 m ²  g ^-1的相对高表面积，且具有约10 nm的大孔径。值得注意的是，Ti ³⁺ -TiO ₂/ Meso-gC ₃ N ₄异质结在降解废水中的苯酚方面表现出出色的可见光驱动的光催化活性。Ti ³⁺ -TiO ₂ / Meso-gC ₃ N ₄异质结的光催化产氢率升至〜290.2μmolh ^-1  g ^-1，是裸Meso-gC ₃ N的约4倍和14倍分别为₄和TiO ₂。增强的光催化活性可以归因于介孔结构提供足够的表面活性位点和Ti ³⁺的协同作用 自掺杂和形成的异质结促进了光生电子-空穴对的空间分离。