Precise fabrication of porous one-dimensional gC3N4 nanotubes doped with Pd and Cu atoms for efficient CO oxidation and CO2 reduction
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Rational design of graphitic carbon nitride nanostructures (gC3N4) is vital for various catalytic applications. Herein, we synthesized porous gC3N4 nanotubes (gC3N4NTs) doped with Pd and Cu (Pd/Cu/gC3N4NTs) via the consecutive polymerization of melamine in an ethylene glycol solution containing the metal precursors followed by annealing. The gC3N4NTs, thus produced, possess a well-defined one-dimensional porous nanotube architecture, large surface area (240 m2 g−1), and a homogenous dispersion of Pd and Cu with no need for templates and/or multistep reactions. This merits the CO oxidation activity of Pd/Cu/gC3N4NTs by 56 °C and 96 °C higher than that of Pd/gC3N4NTs and Cu/gC3N4NTs, respectively. The CO2 reduction activity of Pd/Cu/gC3N4NTs was a 5.5-fold higher than metal-free gC3N4NTs. Also, the UV-light irradiation enhanced the CO2 performance of Pd/Cu/gC3N4NTs by three times. The presented study may pave the way for the utilization of metal-doped gC3N4NTs in various applications.