Biomimetic synthesis of Ag3PO4-NPs/Cu-NWs with visible-light-enhanced photocatalytic activity for degradation of antibiotic Ciprofloxacin
Ag3PO4-NPs/Cu-NWs are constructed to enhance the visible-light-driven photocatalytic activity via biomimetic synthesis. Cu nanowires (NWs) were synthesized by facile hydrothermal method. During the process of biomimetic synthesis, the porous PTFE film, which can mimic the transport process of cell membrane, plays an important role in controlling the transport speed of silver ions (Ag+) to decrease the reaction speed . Thus the inhibition of replacement reaction of Ag+/Cu and the uniform growth of Ag3PO4 nanoparticles (NPs) with the diameter about 10nm on Cu-NWs can be realized simultaneously. The diameter of Ag3PO4-NPs/Cu-NW is about 70 nm. Owing to the high electron transportation of single crystal Cu-NWs, the free electrons in Ag3PO4 are transfered out and promoting photogenerated electron–hole pairs separation. The stability of Ag3PO4 NPs of the Ag3PO4-NPs/Cu-NWs had been improved, the photodecomposition no longer occurs . Meanwhile, the band-gap of Ag3PO4 decreased to 2.07 eV after coated with Cu-NWs and expanded the absorption scope of visible-light. In addition, the active species-trapping experiments indicated that the holes and •O2− play important roles in the photocatalytic reaction. The novel Ag3PO4-NPs/Cu-NWs were used for the degradation of Ciprofloxacin(CPFX) as the first time and showed high photocatalytic degradation performance. After visible-light irradiated 15 min, the degradation rates of CPFX with pure Ag3PO4 NPs and AC0.3 as catalysts are about 27% and 53%. In the end, the degradation efficiency of Ag3PO4-NPs/Cu-NWs is 6.07 times of the pure Ag3PO4 NPs.