A novel visible-light-activated photocatalyst consisting of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles were synthesized through a tunable in situ deposition method. The morphology and microstructure of the C 3 N 4 /Ag 3 PO 4 nanocomposites were carefully characterized by scanning electron microscope, TEM, X-ray diffraction (XRD), energy-dispersive X-ray analysis (EDX), X-ray photoelectron spectra, and so on. The porous C 3 N 4 /Ag 3 PO 4 nanocomposites were featured by the typical platelet-like morphology, with an average crystallite size of about 39 nm. The coexistence of porous graphitic C 3 N 4 nanosheets and Ag 3 PO 4 nanoparticles is confirmed via the XRD and EDX results. Owing to its narrower band gap of Ag 3 PO 4 , the nanocomposites displayed a significant redshift of UV–Vis spectral absorption edge together with expanded light absorption in comparison with g-C 3 N 4 nanosheets. The photocatalytic activity of the prepared C 3 N 4 /Ag 3 PO 4 nanocomposites is demonstrated by the photodegradation of 4-chlorophenol (4-CP). The C 3 N 4 /Ag 3 PO 4 nanocomposites displayed higher photocatalytic activity than pure C 3 N 4 or Ag 3 PO 4 , which could be attributed to the interfacial effect of the nanocomposites in inhibiting the unfavorable recombination of photogenerated electrons and holes. Electron spin resonance spin-trap study implied that the generation of hydroxyl radicals plays the key role in the photodegradation of 4-CP by the C 3 N 4 /Ag 3 PO 4 nanocomposites under visible light irradiation.
Bo Zhang,Yi Chen,Haonan Zheng,Changhao Li,Lili Ma,Hong Zhang,Baoxiang Wang,Chuncheng Hao
Herein, composites of Co-doped graphitic C3N4 nanosheets and TiO2 nanoparticles (Co-C3N4 NSs/TiO2 NPs) were prepared through a two-step synthetic strategy, and their electrorheological (ER) performance under varied electric field strengths was also researched. The microstructure, chemical elements, and surface morphology of materials were studied thoroughly by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, Brunauer–Emmett–Teller (BET) test, and X-ray photoelectron spectroscopy (XPS) measurements. The presence of TiO2 NPs and g-C3N4 was confirmed by XRD and FTIR results. Typical SEM and TEM images revealed the apparent sheet-like nanostructure of Co-C3N4, and the filling of TiO2 NP in-layers was discovered. Meanwhile, BET results indicated the abundant pore structure of Co-C3N4 NSs/TiO2 NP composites. The ER performances of Co-C3N4 NSs/TiO2 NP composites, including shear stress, shear viscosity, and ER efficiency, were examined under different electric field strengths with a high-quality electrorheometer. Interestingly, the obtained Co-C3N4 NSs/TiO2 NP composites exhibited an excellent ER property including an unexpected ER efficiency (up to 196), superior platform area, obvious dielectric loss peak, and high shear stress (more than 600 Pa at 3.0 kV/mm), showing wide application prospects as electrorheological materials.
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