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Particle size effects of tetrahedron-shaped Ag3PO4 photocatalyst on water-oxidation activity and carrier recombination dynamics
摘要： We investigated photocatalytic water-oxidation performance of tetrahedron-shaped silver phosphate (Ag3PO4) crystals with various particle sizes. The performance was clearly influenced by the particle size. The maximum activity was found for the particle with a tetrahedron edge with 1.5 μm length, which showed the highest rate of oxygen evolution. A series of analysis against time-resolved diffuse reflection spectra of the powder samples reveals that not only carrier recombination dynamic but also photoexcited carrier density can play important roles in the water oxidation. Our finding should contribute to give one of the basic ideas when designing semiconductor photocatalysts for water splitting.
关键词： Silver phosphate,Photocatalytic water oxidation,Global analysis,Carrier dynamics
更新于2025-11-19 16:51:07
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A novel photocatalytic membrane decorated with PDA/RGO/Ag3PO4 for catalytic dye decomposition
摘要： In this study, a reduced graphene oxide/silver phosphate (RGO/Ag3PO4) was obtained via polydopamine (PDA) modification, and the PDA/RGO/Ag3PO4 composite was coated on the pure polyvinylidene fluoride (PVDF) membrane, which named PDA/RGO/Ag3PO4/PVDF memebrane. The PDA/RGO/Ag3PO4 was characterized by Fourier transform infrared (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Futhermore, the SEM, Energy dispersive spectrometer (EDS) spectrograms and Atomic force microscopy (AFM) were used to characterize the morphology structure, elemental mapping and roughness of PDA/RGO/Ag3PO4/PVDF memebrane. The results showed that the composite membrane has a good effect on the degradation of dyes, and the rejection rate of MB reached 99% with an increasing of the composite material ratio. The hydrophilicity of the membrane surface increased by measuring the contact angle, with decrease to 59.2°compared with 88.2°of pure PVDF membrane. In addition, under the visible light irrradiation, the coated membrane still keeps stable flux and high separation efficiency after 5 cycles. Hence, this study provides an attractive PVDF modified membrane.
关键词： graphene oxide,polydopamine,silver phosphate,dye rejection,coating membrane
更新于2025-09-10 09:29:36