Insight into the Catalytic Behavior in Nitroarenes Reduction over Non‐Noble Metals Modified Polymer Carbon Nitride

다국어 초록 (Multilingual Abstract)

Revealing the catalytic mechanism and dynamic process in heterogeneous catalysis is fundamental and tremendous important. Here, non‐noble metals (Bi, Cu, Cu2O or CuO) hybrided polymer carbon nitride nanosheets (CNN) were fabricated through ions intercalation processes. The prepared Bi‐CNN hybrid exhibits moderate catalytic activity compared with Cu–CNN in 4‐nitrophenol (4‐NP) reduction. The kinetic rate constant and apparent active energy of Bi‐CNN are 0.04 min−1 (20 °C) and 53.6 ± 4.8 kJ mol−1, respectively. Cu‐modified CNN shows a rate of 0.65 min−1, which is 16 times higher than that of Bi‐CNN and even higher than noble metal (Au, Ag)‐CNN hybrids. More importantly, a new catalytic behavior that no delay time (usually reported by using noble metals and metal oxides) was observed in the 4‐NP reduction over Bi‐CNN and Cu–CNN hybrids. A possible catalytic mechanism elaborated this new catalytic phenomenon was proposed based on the chemical redox potentials. The CuO‐CNN and Cu2O‐CNN hybrids were further prepared to verify the proposed catalytic model. This work provides more insight into the mechanistic investigation of nitroarenes reduction over non‐noble metal catalyst evolved photocatalytic systems.
A new catalytic behavior that no lag time was observed in the 4‐NP reduction over non‐noble metal (Bi, Cu)‐CNN hybrids. A proposed catalytic model and mechanism was suggested based on the chemical redox potentials to elaborate this new catalytic phenomenon.