石墨烯基复合催化剂的光催化杀菌效应

以醋酸锌、尿素、天然沸石和石墨烯为原料,采用水热-煅烧法分别制备了氧化锌/红辉沸石(ZnO/stellerite)和氧化锌/石墨烯(ZnO/graphene)两种复合光催化剂。运用X射线衍射仪(XRD),扫描电子显微镜(SEM)N。吸附仪(BET)和紫外-可见光谱仪(UV-Vis DRS)对催化剂的组成、形貌、比表面积、孔径分布和光吸收性能进行了分析。结果表明:制备的复合光催化剂ZnO/ stellerite和ZnO/graphene均具有良好的六方纤锌形貌;ZnO粒径分别为22.42 nm和15.72 nm;S;r分别为16.54 m'/g和35.55 m'/g;graphene与ZnO之间构筑的三维结构,使光响应扩展到可见光区域,抑制了自由电子的复合,促进了界面电荷迁移。日光灯照射下灭活金黄色葡萄球菌(S.aureus）的试验结果表明,复合催化剂ZnO/graphene的最优杀菌浓度为100 mg/L,其杀菌效率与ZnO/stellerite相比明显提高,杀菌速率常数k为ZnO/stellerite的1.31倍,达到1.17 h'。

Disinfection effects induced by graphene-based photocatalytic?composites under solar light illumination

ZnO/graphene and ZnO/stellerite composite photocatalysts were prepared through a facile hydrothermal-calcination processing with zinc acetate , urea , natural stellerite and graphene.The composition , morphology , specific surface area ,pore size distribution and light absorption properties of prepared?composites were characterized by scanning electron microscopy(SEM), X-ray diffraction (XRD ) ,nitrogen adsorption/desorption and UV-visible diffused reflectance spectroscopy (UV-vis DRS ). It was?found that the prepared photocatalysts ZnO/stellerite and ZnO/ graphene had wurtzite ZnO phase morphology with ZnO paticle sizes of 22.42 nm and 15.72 nm.SHEr of composites were 16.54 m'/g and?35.55 m'/g respectively.3D structure between ZnO and graphene resulted in the response to visible?light region , reduced recombination of free charges , and enhanced interface charge transfer.'The disinfection action towards Staphylococcus aureus ( S.aureus)under solar light showed that the optimal amount of ZnO/graphene was 100 mg/L.ZnO/graphene exhibited significantly enhanced photocatalyticdisinfection efficiency than ZnO/stellerite powders , and disinfection rate up to 1.17 h'is 1.31 times?that of ZnO/stellerite composite.