Ag修饰Bi_(2)GeO_(5)的制备及光催化处理TNT废水性能研究  

Preparation of Ag modified Bi_(2)GeO_(5) and study on the photocatalytic treatment of TNT wastewater

作　　者：刘文辉 颜秀真 张鑫慧 LIU Wenhui;YAN Xiuzhen;ZHANG Xinhui(School of Environment and Safety Engineering,North University of China,Taiyuan 030000,China;College of Physical Education,Shanxi University,Taiyuan 030000,China)

机构地区：[1]中北大学环境与安全工程学院,太原030000 [2]山西大学体育学院,太原030000

出　　处：《安全与环境学报》2023年第7期2457-2465,共9页Journal of Safety and Environment

基　　金：山西省研究生创新项目(2021Y653)。

摘　　要：为了进一步提高Bi_(2)GeO_(5)的催化活性,为炸药废水实际处理提供可借鉴的方法,采用一步溶剂热法,以一定比例的水和二乙醇胺混合物为溶剂,AgNO_(3)为Ag源,用Ag修饰Bi_(2)GeO_(5)纳米粒子,制备Ag修饰的Bi_(2)GeO_(5)光催化剂。利用X射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱仪(XPS)、N_(2)吸附-脱附和紫外-可见分光光度计(UV-Vis)对所制备的复合光催化剂进行表征,随后通过降解TNT试验测试所制备复合材料的光催化性能,评估了不同配比的Ag修饰对Bi_(2)GeO_(5)光催化剂所制备产物的光催化活性的影响。结果表明,0.1 g Ag修饰的Bi_(2)GeO_(5)光降解TNT的性能要优于其他比例修饰的Bi_(2)GeO_(5),在25 min内光催化降解率达到94%,TNT几乎被完全降解。适量Ag修饰提高了Bi_(2)GeO_(5)光催化剂的电荷分离和转移。This study aims to further improve the catalytic activity of Bi_(2)GeO_(5),providing a reference method for the actual treatment of explosive wastewater.The one-step solvothermal method is adopted to stir 0.26 g GeO_(2) and 2.5 g Bi(NO_(3))_(3)·5H_(2)O into 40 mL mixture formed by mixing 10 mL deionized water and 30 mL diethanolamine as the solvent.AgNO_(3) is used as the source of Ag.Bi_(2)GeO_(5) nanoparticles are modified with Ag to prepare an Ag-modified Bi_(2)GeO_(5) photocatalyst.0,0.25 mmol,0.5 mmol,0.75 mmol AgNO_(3)are added into the mixed solution and stirred,then sealed in the reactor with reaction at 170℃for 24 h.R_(N) is defined as the atomic ratio of Ag to Ge.The values of R_(N) are set as 0,0.1,0.2,0.3,and labeled as pure Bi_(2)GeO_(5),0.1Ag-Bi_(2)GeO_(5),0.2 Ag-Bi_(2)GeO_(5),and 0.3Ag-Bi_(2)GeO_(5).The prepared composite photocatalyst is characterized by XRD,SEM,TEM,XPS,N_(2) adsorption,and UV-VIS.Among them,XRD analysis shows that Ag is modified on Ag-Bi_(2)GeO_(5),SEM,and TEM.SAED analysis shows that the morphology of pure Bi_(2)GeO_(5) microflower is mainly composed of layered microflowers with an average diameter of 3μm,which are composed of two-dimensional nanosheets with a smooth surface.Ag-Bi_(2)GeO_(5) microflower is formed by a large number of Ag-Bi_(2)GeO_(5) nanosheets through the self-assembly method,and the prepared Ag-Bi_(2)GeO_(5) microstructure has a typical hierarchical structure.The Ag-Bi_(2)GeO_(5) nanosheets made of Ag-Bi_(2)GeO_(5) microflowers are thicker than those made of pure Bi_(2)GeO_(5) microflowers and these Ag-Bi_(2)GeO_(5) nanosheets are single crystal.XPS test results are consistent with XRD and XPS results,indicating that The Ag-modified Bi_(2)GeO_(5) sample is successfully prepared and there are oxygen vacancy defects on the surface.The optical property analysis shows that 0.1Ag-Bi_(2)GeO_(5) has the best UV-Vis absorption effect,indicating that the amount of Ag modification needs to be moderate,and excessive modification is not conducive to light absorption p

关 键 词：环境工程学 一步溶剂热法 Bi_(2)GeO_(5) 光催化 TNT降解 

分 类 号：X791[环境科学与工程—环境工程]