Shewanella oneidensis MR-1生物法绿色合成Au/CdS/rGO和光催化性能研究  

Biosynthesis of Au/CdS/rGO using Shewanella oneidensis MR-1 and Their Photocatalytic Performance Research

作　　者：宋小杰[1] 王秀芳[1] 杨帆[2] SONG Xiaojie;WANG Xiufang;YANG Fan(Key Laboratory of and Functional Molecule Design and Interface Process,Anhui Jianzhu University,Hefei 230601,China;Department of Chemistry,Anhui Medical University,Hefei 230026,China)

机构地区：[1]安徽建筑大学功能分子设计与界面过程重点实验室,安徽合肥230601 [2]安徽医科大学基础医学院,安徽合肥230026

出　　处：《安徽建筑大学学报》2021年第4期46-51,共6页Journal of Anhui Jianzhu University

基　　金：安徽省教育厅自然科学重点项目(KJ2019A0773);安徽建筑大学博士科研启动基金项目(2019QDZ23)。

摘　　要：本论文以氯金酸作为前驱体,用环境广泛存在的革兰氏阴性菌希瓦氏菌(Shewanella oneidensis MR-1)生物法原位还原制备了Au/CdS/rGO纳米复合材料。用X射线衍射仪(XRD)、透射电子显微镜(TEM)和X射线光电子能谱(XPS)对制备的纳米复合材料进行表征,结果表明Au/CdS/rGO纳米复合材料被成功合成;XRD图谱显示出有Au、CdS和rGO的特征峰;TEM图谱显示纳米颗粒粒径10-20 nm,并且较好地分散在rGO上。Au/CdS/rGO纳米复合材料的光催化性能研究以亚甲基蓝溶液(40 mg/L)作为模拟污染源进行光降解,催化剂的用量为50 mg,在模拟太阳光光照情况下,70 min纳米复合材料的降解率可达98.86%,优于单纯的CdS和rGO材料,并且循环三次以后降解率为78.42%。本实验微生物参与一步合成纳米复合材料的方法使得在不引入化学还原剂的情况下制备高效纳米复合催化剂成为可能,为生物法合成多种性能的功能纳米复合材料,同时减少生态环境污染提供了借鉴。In this thesis,Au/CdS/rGO was prepared using chloroauric acid as the precursor by in situ reduction of the gram-negative bacterium Shewanella oneidensis(MR-1)which widely present in the environment.X-ray diffractometer(XRD),transmission electron microscope(TEM)and X-ray photoelectron spectroscopy(XPS)were used to characterize the prepared nanocomposites;The results showed that Au/CdS/rGO nanocomposites were successfully synthesized.XRD patterns demonstrated that there were characteristic peaks of Au,CdS and rGO.TEM spectroscopy showed that the size of nanoparticles is 10-20 nm,and they are well dispersed on rGO.The photocatalytic performance of Au/CdS/rGO nanocomposites were studied.Methylene blue solution(40 mg/L)was used as a simulated pollution source for photodegradation.The amount of catalyst was 50 mg.The degradation rate of nanocomposites can reach up to 98.86%within 70min under simulated sunlight,which is better than pure CdS and rGO materials.The degradation rate is 78.42%after three cycles.The method of microbial participation in the one-step synthesis of nanocomposite materials in this experiment makes it possible to prepare high-efficiency nanocomposite catalysts without introducing chemical reducing agents,which provides a reference for the biological synthesis of functional nanocomposites with various properties while reducing environmental pollution.

关 键 词：Au/CdS/rGO 纳米复合材料 生物法合成 光催化 亚甲基蓝 

分 类 号：O614.123[理学—无机化学]