Rapid recombination of photogenerated electron-hole pairs and low utilization of visible light are still restricting the photoreduction efficiency of aqueous Cr(VI) of graphitic carbon nitride. In this work, cyano group (-CN) modulated porous carbon nitride assisted by silver nanowire was successfully constructed. Caused by the intense electron acceptors of -CN, the co-existence of both n-type and p-type semiconductor characteristics was exhibited in -CN modulated porous carbon nitride. The built-in electric field derived from the -CN modulated p-n homojunction was suitable to promote separation of electron-hole pairs and retain photogenerated charges with stronger redox capability. In addition, the assisted silver nanowire further enhanced the visible light harvesting derived from the surface plasmon resonance effect of silver nanowire. As expected, the distinctive design could synergize p-n homojunction and plasmonic metal/semiconductor, which was beneficial to strengthen photocatalytic reduction of aqueous Cr(VI) under visible light. The photocatalyst with the unique structure displayed an enhanced photocatalytic reduction efficiency of aqueous Cr(VI) under visible light in comparison with the pristine graphitic carbon nitride. After 2.5 hours visible light irradiation, the aqueous Cr(VI) was almost removed. The visible light photocatalytic reaction rate constant of Cr(VI) over Ag-CN/KOH-2 is about 13.8 times than BCN.

光生电子-空穴对的快速重组和可见光利用率低仍然限制着石墨氮化碳水溶液Cr（VI）的光还原效率。在这项工作中，成功地构建了由银纳米线辅助的氰基（-C N）调制的多孔氮化碳。由-C N的强电子受体引起，在-C N调制的多孔氮化碳中同时表现出n型和p型半导体特性的共存。源自-C的内置电场N调制的pn同质结适合促进电子-空穴对的分离，并保留具有较强氧化还原能力的光生电荷。另外，辅助的银纳米线进一步增强了源自银纳米线的表面等离子体共振效应的可见光收集。如预期的那样，独特的设计可以使pn同质结与等离子体金属/半导体协同作用，这有利于加强可见光条件下Cr（VI）水溶液的光催化还原。与原始石墨碳氮化物相比，具有独特结构的光催化剂在可见光下显示出更高的Cr（VI）水溶液光催化还原效率。2.5之后 在可见光照射1小时后，几乎除去了Cr（VI）水溶液。Cr（VI）在Ag-CN / KOH-2上的可见光光催化反应速率常数约为BCN的13.8倍。