Plasmon Ag/Na-doped defective graphite carbon nitride/NiFe layered double hydroxides Z-scheme heterojunctions toward optimized photothermal-photocatalytic-Fenton performance

Three-dimensional flower-shaped plasmon Ag/Na-doped defective graphitic carbon nitride/NiFe layered double hydroxides (Ag/NaCNN/NiFe-LDH) Z-scheme heterojunction are fabricated by hydrothermal and calcination methods. The flower-shaped structure of NiFe-LDH enhances the multiple reflection and scattering of light, providing enough active sites to improve the utilization of sunlight. The introduction of Na-doped defects narrows the band gap of graphitic carbon nitride and accelerated the charge separation. Due to the surface plasmon resonance effect of Ag, Ag/NaCNN/NiFe-LDH shows excellent photothermal effect. The synergistic effect of photothermal-photocatalytic-Fenton reaction and Z-scheme heterojunction increased the hydrogen production of Ag/NaCNN/NiFe-LDH by 0.543 mmol h−1, which was 10 times higher than that of NiFe-LDH. The degradation efficiency of p-nitrophenol and bisphenol A under visible light was 99%. This simple strategy and reasonable design provide new ideas for the construction of Z-scheme heterojunction photocatalysts. Plasmon Ag/Na-Doped Defective Graphite Carbon Nitride/NiFe Layered Double Hydroxides Z-Scheme Heterojunctions are fabricated via simple hydrothermal and calcination methods, which exhibit excellent photothermal-photocatalytic-Fenton performance. The main reason can be ascribed to the SPR effect of Ag, Na-doped and the formation of Z-scheme heterojunction facilitates spatial charge separation. [Display omitted] •Plasmon Ag/NaCNN/NiFe-LDH Z-scheme heterojunction is fabricated.•It shows excellent photothermal-photocatalytic-Fenton performance.•The band gap is narrowed by Na-doped defects.•It is the synergy of photocatalytic-Fenton and SPR effect.•It shows excellent H2 production and degradation properties.