《Table 1 BET analysis of pure Zn O, BiOI and BiOI/Zn O hybrid nanoflowers》

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《新型ZnO/BiOI杂化纳米花的合成及可见光驱动抗菌活性（英文）》

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N2adsorption-desorption isotherm measurement was performed to investigate the surface and porous structures of Zn O，BiOI and Zn O/BiOI nanoflowers.As shown in Fig.5，BiOI and Zn O/BiOI hybrid nanoflower display type-Ⅳisotherms with a distinct hysteresis loop in the range of 0.5—1.0（P/P0）indicating the presence of mesoporous structure[27].The conclusion is fully supported by the pore size distribution curves（inset）obtained from the N2isotherms.According to the result，the specic BET surface areas of Zn O，BiOI and Zn O/BiOI nanoflowers are 3.59m2·g-1，47.65 m2·g-1，55.61 m2·g-1，respectively.The deposition of BiOI not only had an obvious effect on the morphology of Zn O/BiOI composites，but also could greatly increase the absorbed area.Besides，the total pore volume also increases greatly from 0.017 cm3·g-1of Zn O and 0.166 cm3·g-1of BiOI to 0.231 cm3·g-1of Zn O/BiOI hybrid nanoflowers（Table1）.The existence of large number of pore structure greatly enhances the specific surface area of Zn O/BiOI nanocomposites，and promotes the absorption of photons and the activation of Zn O and BiOI produce more electron-hole pairs，which improves the photocatalytic performance of the material[28].What’s more，the large pore of ZnO/BiOI allows an easy diffusion of pathogens in and around the nanocomposites，thus it can enhance the adsorption of pathogens，and it intermediates on the surface of the photocatalysts as well.