As a typical metal-free photocatalyst, graphitic carbon nitride (g-C₃N₄) has attracted great attention for photocatalytic degradation of various organic pollutants. In this study, three-dimensional (3-D) phosphorus (P)-doped porous g-C₃N₄ nanosheets were prepared successfully via the thermal oxidation and element doping associated method. Abundant in-plane mesopores (from 2 nm to 50 nm), high specific surface area (202.9 cm² g⁻¹) and desirable P content (0.87%) were obtained for this 3-D P-doped porous g-C₃N₄ nanosheets. Taking Rhodamine B as a model pollutant, the photocatalytic properties of this 3-D P-doped porous g-C₃N₄ nanosheets photocatalyst were investigated, and the mechanism of photocatalytic degradation was also proposed. The 3-D P-doped porous g-C₃N₄ nanosheets showed the much enhanced visible-light photocatalytic activity, with Rhodamine B degradation ratio of 99.5% and a kinetic reaction rate constant of 0.120 min⁻¹, compared to porous g-C₃N₄ nanosheets (58.2% and 0.031 min⁻¹). The catalytic mechanism analysis shows that the active radicals of •OH and •O₂⁻ have strong oxidizing property, which can quickly decompose target organic dyes. The mesoporous structure and high P content of doping endowed photocatalyst with abundant active sites, high conductivity, and efficient separation of photoproduced electron-hole pairs.

作为典型的不含金属的光催化剂，石墨氮化碳（gC ₃ N ₄）在光催化降解各种有机污染物方面引起了极大的关注。在这项研究中，通过热氧化和元素掺杂相关方法成功地制备了三维（3-D）掺杂磷（P）的多孔gC ₃ N ₄纳米片。对于该3-D P掺杂的多孔gC ₃ N ₄纳米片，获得了丰富的平面中孔（2 nm至50 nm），高比表面积（202.9 cm ² g ^-1）和所需的P含量（0.87％）。。以若丹明B为模型污染物，该3-D P掺杂多孔gC的光催化性能_研究了3 N ₄纳米片的光催化剂，并提出了光催化降解的机理。3-d P掺杂多孔GC ₃ Ñ _4个纳米片显示出增强了很多可见光的光催化活性，具有99.5％的若丹明B的降解率和0.120 min的动力学反应速度常数^-1，相对于多孔GC ₃ Ñ ₄纳米片（58.2％和0.031 min ^-1）。催化机理的分析表明，•OH和的活性自由基•Ø ₂ ^-具有强氧化性，可迅速分解目标有机染料。掺杂的介孔结构和高P含量赋予了光催化剂活性位点丰富，电导率高以及光生电子-空穴对有效分离的优点。