Mesoporous nanostructures represent a unique class of photocatalysts with many applications, including splitting of water, degradation of organic contaminants, and reduction of carbon dioxide. In this work, we report a general Lewis acid catalytic template route for the high-yield producing single- and multi-component large-scale three-dimensional (3D) mesoporous metal oxide networks. The large-scale 3D mesoporous metal oxide networks possess large macroscopic scale (millimeter-sized) and mesoporous nanostructure with huge pore volume and large surface exposure area. This method also can be used for the synthesis of large-scale 3D macro/mesoporous hierarchical porous materials and noble metal nanoparticles loaded 3D mesoporous networks. Photocatalytic degradation of Azo dyes demonstrated that the large-scale 3D mesoporous metal oxide networks enable high photocatalytic activity. The present synthetic method can serve as the new design concept for functional 3D mesoporous nanomaterials.
7 Figures and Tables
Figure 1 | (a,b) SEM images of the large–scale 3D mesoporous SnO2 networks. (c) TEM image and the corresponding SAED pattern of the sample. (d,e) HRTEM image and the corresponding FFT pattern. (f) EDS spectrum of the sample.
Figure 2 | (a) Nitrogen adsorption–desorption isotherm plot and (b) Pore size distribution of the as–synthesized samples: CeO2, WO3, SnO2, NiO, Fe2O3, CuO, Co3O4.
Figure 3 | XRDpatterns (a) andRaman spectra (b) of the initial precursors and intermediate products of the 3Dporous SnO2 networks. I: hybrid FAR– Sn composite, II: 3 h reaction, III:, IV: 6 h reaction.
Figure 4 | SEM images of the as-synthesized 3Dmesoporous metal oxide networks. (a) WO3, (b) Fe2O3, (c) Co3O4, (d) NiO, (e) CuO, and (f) CeO2.
Figure 5 | (a) SEM image of the as-synthesized 3D TiO2/WO3 mesoporous networks. (b) EDS spectroscopy of the sample. (c) and (d) EDS elemental mapping of Ti and W, respectively. (e) and (f) Low-magnification TEM
Figure 6 | (a,b) Low–magnification SEM image of the as–synthesized 3D HMM WO3 networks. (c) High-magnification SEM image of the WO3 networks. (d) SEM images of the HMM TiO2/WO3 networks.
Figure 7 | (a,b) SEM images of the as-synthesized 3D porous Au/WO3 hybrid networks. (c,d) EDS elemental mapping analysis of W and Au.
Download Full PDF Version (Non-Commercial Use)