Abstract
In this work, we developed a sustainable catalytic system based on bimetallic RuPd nanoparticles (4.6 ± 1.1 nm) supported on graphitic carbon nitride for the photofixation of nitrogen to ammonia in water at 25 °C. The ammonia production rates, expressed in terms of the NH4+ formed, reached up to 1389.84 μmol·g–1·h–1, which was much superior to those observed for the monometallic ones. This excellent result can be attributed to the beneficial synergism between the two metals that leads to singular catalytic properties. Also, the bimetallic nanoparticles seem to offer a suitable condition to trap the photoexcited electrons from the semiconductor support, favoring the photoreaction. In addition, ethanol, a renewable biomass-derived compound, was used as an environment-friendly sacrificial agent, which afforded even better ammonia production when compared to previously reported studies applying methanol, a common agent chosen in the N2 photofixation process.
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