Low Temperature Synthesis of Silver Cyanamide Modified Graphite Phase Carbon Nitride and Its "Dual Channel" Photocatalytic Hydrogen Peroxide Production Ability.

Metal cyanamide compounds represent a new class of solar photoactive materials. In this study, an Ag 2 NCN /g-C3N4 composite catalyst was synthesized using an in situ precipitation method at low temperatures. The catalyst was characterized by XRD, TEM, UV-Vis, XPS and other analytical techniques. Compared to conventional synthesis at normal temperature, the low-temperature approach significantly reduces the particle size of Ag 2 NCN and enhances its dispersion on the surface of g-C3N4, leading to improved charge separation efficiency and photocatalytic hydrogen peroxide production. When the loading capacity of Ag 2 NCN is 12%, the Ag 2 NCN /g-C3N4 composite catalyst demonstrates optimal H 2 O 2 production performance. The H 2 O 2 concentration in the system reaches 123 μ mol ⋅ L − 1 , which is 2.3 and 4.1 times higher than that of neat CN and Ag 2 NCN. Additionally, a possible "dual channel" reaction mechanism for photocatalytic hydrogen peroxide production was proposed. The "Z" type heterojunction catalyst Ag 2 NCN /g-C3N4 was prepared by low temperature in situ precipitation. Such "dual-channel" system greatly enhances the utilization efficiency of photogenerated carriers, thereby improving the photocatalytic H 2 O 2 production performance. This paper provides a new idea for the synthesis of high performance photocatalytic materials. [ABSTRACT FROM AUTHOR]