Rh/Polymeric Carbon Nitride Porous Tubular Catalyst: Visible Light Enhanced Chlorophenols Hydrodechlorination in Base-free Aqueous Medium
Self-assembled novel porous tubular Rh/polymeric carbon nitride (PCN) photocatalyst was prepared by simple impregnation reduction method. Both SEM and XRD revealed that PCN was dispersed and curled in alcohol-water mixture during the impregnation process; Rh/PCN further self-assembled to novel porous tubular structure in the course of NaBH4 reduction. Small Rh(0) nanoparticles were uniformly dispersed on the self-assembled PCN (TEM), which was beneficial to improve the separation efficiency of photogenrated electrons and holes, enhance light absorption and facilitate the process of photocatalytic hydrodechlorination (HDC). Highly promoted catalytic activity (3.12 times promotion in TOF) and excellent reusability could be achieved in the chlorophenols HDC at ambient base-free conditions with visible light. The harmful chlorophenols were easily converted to high-valued cyclohexanol and cyclohexanone in the catalytic process. In combination with series characterizations, possible mechanism of Rh/PCN photocatalytic HDC was proposed.