石墨烯基复合催化剂的光催化杀菌效应  

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

作　　者：张万众 姚登科 程沈航 于彩虹[1] 孙志明[1] 郑水林[1] Zhang Wanzhong;Yao Dengke;Cheng Shenhang;Yu Caihong;Sun Zhiming;Zheng Shuilin(School of Chemical and Environmental Engineering,China University of Mining and Technology,Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《矿业科学学报》2019年第2期162-169,共8页Journal of Mining Science and Technology

基　　金：国家自然科学基金(31471803);中央高校基本科研业务费专项资金(2009QH11)

摘　　要：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_2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_(BET)分别为16.54 m^2/g和35.55 m^2/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^(-1)。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.SBET of composites were 16.54 m2/g and 35.55 m2/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 disin-fection 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 photocatalytic disinfection efficiency than ZnO/stellerite powders,and disinfection rate up to 1.17 h-1 is 1.31 times that of ZnO/stellerite composite.

关 键 词：氧化锌 石墨烯 红辉沸石 金黄色葡萄球菌 抗菌速率 

分 类 号：O643.36[理学—物理化学] O644.1[理学—化学]