通过水热法以固体 AgNO3为 Ag 离子来源,成功制备出系列 Ag 离子改性修饰 Bi2 WO6复合光催化剂,并采用 X 射线衍射(XRD)、场发射扫描电子显微镜(FESEM)、X 射线光电子能谱仪(XPS)、能谱仪(EDS)和紫外-可见漫反射光谱(DRS)技术对其进行分析表征。研究表明,Ag 离子可能取代 Bi2 WO6中的Bi3+离子进入晶格,从而调节了禁带宽度。另一方面,纯Bi2 WO6与Ag离子改性修饰Bi2 WO6样品均为由纳米片自组装而成的球形结构,直径约为2~6μm。与纯Bi2 WO6相比,Ag离子改性修饰Bi2 WO6样品的结晶度较高且纳米片的排列也更致密,其光催化活性明显提高。在本文中形貌和能隙的优化是光催化性能提升的主要原因。当AgNO3的投加量为10%(摩尔分数)时,罗丹明B的降解率提高了近42%。
A series of Ag ions modified Bi2 WO6 photocatalyst were synthesized successfully by hydrothermal method with solid silver nitrate and characterized by X-ray diffraction (XRD),field emission scanning electron microscope (FESEM),X-ray photoelectron spectrometer (XPS),energy dispersive X-ray detector (EDS)and UV-Vis diffusion reflectance spectra techniques (DRS).The result indicated that Ag ions may replace Bi3+ ions of bismuth tungstate into the crystal lattice,which regulates the forbidden band width.On the other hand, pure Bi2 WO6 and Ag ions modified Bi2 WO6 were both ball-like samples self-assembled with nanoplates.Com-pared with pure Bi2 WO6 ,Ag ions modified Bi2 WO6 samples have higher crystallinity and relatively closer ar-rangement in nanoplates,also more prominent photocatalytic activity.The optimization of morphology and en-ergy gap was the main reason to enhance the photocatalytic performance in this experiment.And the degrada-tion rate of RhB was increased by almost 42% while the quantity of AgNO3 adding content was 10 mol%.
参考文献
| [1] | Fujishima A;Honda K .Electrochemical photolysis of wa-ter at a semiconductor electrode[J].NATURE,1972,5358(238):37-38. |
| [2] | Shi Liyi;Hu Yingyu;Li Chunzhong et al.Preparation of TiO2 ultrafine particles by water-in-oil microemulsion re-action[J].Journal of Functional Materials,1999,30(05):490-495. |
| [3] | Zhou Limin;Wang Yiping;Liu Zhirong .Preparation of TiO2/Al2 O3 nanoparticles with sol-gel method[J].Jour-nal of Functional Materials,2007,38:2106-2109. |
| [4] | Kamat P V;Huehn R;Nicolaescu R .A "sense and shoot”approach for photocatalytic degradation of organic con-taminants in water[J].Journal of Physical Chemistry B,2002,106(04):788-794. |
| [5] | Xue Lin;Peng Lv;Qingfeng Guan;Haibo Li;Hongjv Zhai;Chunbo Liu .Bismuth titanate microspheres: Directed synthesis and their visible light photocatalytic activity[J].Applied Surface Science: A Journal Devoted to the Properties of Interfaces in Relation to the Synthesis and Behaviour of Materials,2012(18):7146-7153. |
| [6] | Hou J G;Wang Z;Jiao S Q et al.3D Bi12 TiO20/TiO2 hier-archical heterostructure:synthesis and enhanced visible-light photocatalytic activities[J].Journal of Hazardous Materials,2011,192:1772-1779. |
| [7] | 胡蕾,叶芝祥,杨浩,徐成华,杨怀金,曲兵.Ag - BiVO4催化剂的制备及其可见光催化活性[J].化工环保,2011(03):273-276. |
| [8] | Tang J W;Zou Z G;Ye J H .Efficient photocatalytic de-composition of organic contaminants over CaBi2 O4 under visible-light irradiation[J].ANGEWANDTE CHEMIE-INTERNATIONAL EDITION,2004,34(43):4463-4466. |
| [9] | Shang M;Wang W Z;Zhang L et al.Bi2 WO6 with signifi-cantly enhanced photocatalytic activities by nitrogen do-ping[J].Materials Chemistry and Physics,2010,120(01):155-159. |
| [10] | Lisha Zhang;Huanli Wang;Zhigang Chen .Bi2WO6 micro/nano-structures: Synthesis, modifications and visible-light-driven photocatalytic applications[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2011(1/2):1-13. |
| [11] | Jia Ren;Wenzhong Wang;Songmei Sun .Enhanced photocatalytic activity of Bi2WO6 loaded with Ag nanoparticles under visible light irradiation[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2009(1/2):50-55. |
| [12] | 周海燕,彭银,秦述春.Ag@ Bi2WO6 Composites with High Visible-Light-Driven Photocatalytic Activities Prepared in UV Light Irradiation[J].中国化学：英文版,2011(11):2345-2349. |
| [13] | Danjun Wang;Ganglin Xue;Yanzhong Zhen .Monodispersed Ag nanoparticles loaded on the surface of spherical Bi2WO6 nanoarchitectures with enhanced photocatalytic activities[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2012(11):4751-4758. |
| [14] | Bin Zhou;Xu Zhao;Huijuan Liu .Synthesis of visible-light sensitive M-BiVO4 (M=Ag, Co, and Ni) for the photocatalytic degradation of organic pollutants[J].Separation and Purification Technology,2011(3):275-282. |
| [15] | Zhang SC;Zhang CA;Man Y;Zhu YF .Visible-light-driven photocatalyst of Bi2WO6 nanoparticles prepared via amorphous complex precursor and photocatalytic properties[J].International Journal of Quantum Chemistry,2006(1):62-69. |
| [16] | Dong Young Kim;Sujung Kim;Misook Kang .Synthesis of Bi2WO6 Nanometer Sheet Shaped and Approach to the Photocatalysis[J].Bulletin of the Korean Chemical Society,2009(3):630-635. |
| [17] | Lisha Zhang;Wenzhong Wang;Zhigang Chen .Fabrication of flower-like Bi2WO6 superstructures as high performance visible-light driven photocatalysts[J].Journal of Materials Chemistry: An Interdisciplinary Journal dealing with Synthesis, Structures, Properties and Applications of Materials, Particulary Those Associated with Advanced Technology,2007(24):2526-2532. |
| [18] | ZHOU Ying,ZHANG Qian,LIN YuanHua,ANTONOVA Elena,BENSCH Wolfgang,PATZKE Greta R..One-step hydrothermal synthesis of hierarchical Ag/Bi2WO6 composites: In situ growth monitoring and photocatalytic activity studies[J].中国科学:化学（英文版）,2013(04):435-442. |
| [19] | Kominami H;Murakami S Y;Kato J I et al.Correlation between some physical properties of titanium dioxide particles and their photocatalytic activity for some probe reactions in aqueous systems[J].Journal of Physical Chemistry B,2002,106(40):10501-10507. |
| [20] | Zhijie Zhang;Wenzhong Wang;Erping Gao .Photocatalysis Coupled with Thermal Effect Induced by SPR on Ag-Loaded Bi2WO6 with Enhanced Photocatalytic Activity[J].The journal of physical chemistry, C. Nanomaterials and interfaces,2012(49):25898-25903. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%