In the first project, copper metallic nanoparticles were immobilized on the surface of the amorphous carbon nitride using the pulse laser ablation in liquid (PLAL) technique in different times of laser irradiation (denoted as Cu-time/a-C 3 N 4 ). The optimized catalyst (Cu-20min/a-C 3 N 4 ) showed 25.5% conversion of cyclohexane with 52.0% selectivity to adipic acid in the one-pot aerobic oxidation. Further, the Cu-40min/a-C 3 N 4 catalyst showed a significant photocatalytic activity in the presence of visible light irradiation for the oxidation of cyclohexane to the ketone-alcohol mixture (KA oil), such that there were 88% conversion and 95% selectivity to the KA oil mixture. In the second project reduction of environmental pollutants by NaBH 4 was studied at room temperature using a series of surface modified carbon fiber felts with Cu(x wt%, x = 1.5, 3.0, 5.0) nanoparticles buried in a nitrogen-doped carbon porous network. In the optimum conditions, Cu(1.5 wt%)/N-CF exhibited the highest rate constant, k = 0.045 s -1 and TOF = 23.7 h -1 , at room temperature for reducing 4-nitrophenol to 4-aminophenol. In the third project, the graphitic carbon nitride layers and ZnO nanoparticles were immobilized successfully on the surface of carbon felt fibers. The catalyst, referred to as ZnO/g-C 3 N 4 /CF, was prepared by the pyrolysis of carbon fiber felts containing different amounts of the melamine and ZnO nanoparticles at 550 °C for 4 h. The optimized catalyst showed 18.8% conversion of ethylbenzene with 99.9% selectivity to acetophenone in the one-pot aerobic oxidation. Also catalyst showed photocatalytic activity in the presence of visible light irradiation for degradation of MB in 40 minutes and Rh B in 60 minutes by hydrogen peroxide as an oxidant. Therefore, this novel composite could be an ideal platform for use as a sustainable heterogenous catalyst in many chemical processes and wastewater treatments.
