Synthesis of
نویسنده
چکیده
Hierarchical macro-mesoporous silica materials co-incorporated with Cr and Ti 12 (MM-Si-Cr-Ti) were directly synthesized by adopting close-packed array of polystyrene 13 microsphere as hard template for macropore through a simple soaking-calcination way, where 14 the Si/Ti ratio was fixed at 200 and Si/Cr ratio varied from 200-10. Ti specie is highly dispersed 15 in the porous matrix and Cr specie mainly existes as tetra-coordinated CrO3 when Si/Cr≧50, and 16 transformed to a mixture of CrO3 and crystallized hexa-coordinated Cr2O3 as determined by 17 wide-angle XRD patterns, raman, EPR spectra and UV-Vis diffuse reflectance spectra. This 1 highly interconnected porous material co-incorporated with Cr and Ti presented visible-light 2 driven photocatalytic activity towards the degradation of AO7, which can be optimized by 3 simply tuning Cr content in the precursor solution. The superiority of hierarchical macro4 mesoporous structure of MM-Si-Cr-Ti over macroporous Si-Cr-Ti oxide (Ma-Si-Cr-Ti) and 5 mesopores (Me-Si-Cr-Ti) for the photocatalytic application was illustrated by a comparative 6 study. The visible light responsive activity is attributed to the effective metal to metal charge 7 transfer from Cr (VI) to Ti (IV), which is benefitted from the uniform dispersion of these two 8 species in the hierarchical porous matrix. 9
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