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

宋小杰; 王秀芳; 杨帆

文章摘要

宋小杰,王秀芳,杨帆.Shewanella oneidensis MR-1 生物法绿色合成 Au/CdS/rGO 和光催化性能研究[J].安徽建筑大学学报,2021,29(4):46-51

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

DOI：

中文关键词: Au/CdS/rGO 纳米复合材料生物法合成光催化亚甲基蓝

英文关键词: Au/CdS/rGO nanocomposites biosynthesis photocatalytic methylene blue

基金项目: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）

作者	单位
宋小杰	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
王秀芳	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
杨帆	安徽医科大学基础医学院，安徽合肥 230026

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中文摘要:

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。

英文摘要:

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），transmissionelectron 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 werecharacteristic peaks of Au，CdS and rGO.TEM spectroscopy showed that the size of nanoparticles is 10-20 nm，and they are welldispersed 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.

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