采用浸渍法合成ZnO/AgNbO3异质结光催化环境净化材料.利用X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电镜(SEM)、紫外漫反射(DRS)等分析方法对催化剂进行了表征.XRD分析结果表明,Zn的掺杂并未改变本体AgNbO3的晶型结构;随着Zn掺杂量和热处理温度的提高,异质结光催化剂体系中ZnO晶相结构逐渐出现;同时,XPS结果也说明Zn以ZnO的形式存在.DRS分析说明ZnO的引入有助于提高可见光区的吸收强度.无论在可见光还是紫外光照射下,光催化降解亚甲基蓝染料(MB)实验证明ZnO掺杂有利于提高AgNbO3的活性.当Zn掺杂量为3 wt%,热处理温度为300℃时,紫外光照射3 h下MB降解率达到93.5%.并对ZnO引入后光催化活性提高的机理进行了分析.
参考文献
| [1] | Long M,Cai W,Cai J,et al.Efficient photocatalytic degradation of phenol over Co3O4/BiVO4 composite under visible light irradiation.J.Phys.Chem.B,2006,110(41):20211-20216. |
| [2] | Kim J Y,Grishin A M.AgTaO3 and AgNbO3 thin films by pulsed laser deposition.Thin Solid Films,2006,515(2):615-618. |
| [3] | Kato H,Kobayashi H,Kudo A.Role of Ag+ in the band structures and photocatalydc properties of AgMO3(M:Ta and Nb)with the perovskite structure.J.Phys.Chem.B,2002,106(48):12441-12447. |
| [4] | Li G Q,Kako T,Wang D F,et al.Composition dependence of the photophnysical and photocatalytic properties of(AgNbO3)1-x(NaNbO3)x solid solutions.J.Solid State Chem.,2007,180(10):2845-2850. |
| [5] | Wang D,Kako T,Ye J.Efficient photocatalytic decomposition of acetaldehyde over a solid-solution perovskite(Ag0.75Sr0.25)(Nb0.75Ti0.25)O3 under visible-light irradiation.J.Am.Chem.Soc.,2008,130(9):2724-2725. |
| [6] | Thompson T L,Yates Jr J T.Surface science studies of the photoactivation of TiO2-new photochemical processes.Chem.Rev.,2006,106(10):4428-4453. |
| [7] | Zou J,Zhu B,Wang L,et al.Zn-and La-modified TiO2 photocatalysts for the isomerization of norbornadiene to quadricyclane.J.Mol.Catal.A:Chem.,2008,286(1/2):63-69. |
| [8] | Chen C,Wang Z,Ruan S,et al.Photocatglytic degradation of C.I.acid orange 52 in the presence of Zn-doped TiO2 prepared by a stearic acid gel method.Dyes andPigments,2008,77(1):204-209. |
| [9] | Chen S,Zhao W,Zhang S,et al.Preparation,characterization and photocatalytic activity of N-containing ZnO powder.Chem.Eng.J.,2009,148(2/3):263-269 |
| [10] | Jason F,Weaver G,Hoflund B.Surface characterization study of the thermal decomposition of AgO.J.Phys.Chem.,1994,98(34):8519-8524. |
| [11] | Tabata K,Choso T,Nagasawa Y.The topmost structure of annealed single crystal of LiNbO3.Surf.Sci.,1998,408(1/2/3):137-145. |
| [12] | Tabata K,Kamada M,Choso T,et al.Photoelectron spectroscopy investigation of NO adsorption on defects of LiNbO3 surfaces.Appl.Surf.Sci.,1998,125(1):93-98. |
| [13] | Atuchina V,Kalabin I,Kesler V,et al.Nb3d and O1s core levers and chemical bonding in niobates.J.Electron.Spectrosc.Relat.Phenom.,2005,142(2):129-134. |
| [14] | Campbell C T.Atomic and molecular oxygen adsorption on Ag(111).Surf.Sci.,1985,157(1):43-60. |
| [15] | Zheng J,Jiang Z,Kuang Q,et al.Shape-controlled fabrication of porous ZnO architectures and their photocatalytic properties.J.Solid State Chem.,2009,182(1):115-121. |
| [16] | Xu H,Li H,Wu C,et al.Preparation,characterization and photocatalytic properties of Cu-loaded BiVO4.J.Hazard.Mater.,2008,153(1/2):877-884. |
| [17] | Takizawa T,Watanabe T,Honda K.Photocatalytic through excitation of adsorbates.2.a comparative study of rhodamine B and methylene blue on cadmium sulfide.J.Phys.Chem.,1978,82(12):1391-1396. |
| [18] | Zhang T,Oyama T,Horikoshi S,et al.Photocatalyzed N-demethylation and degradation of methylene blue in titania dispersions exposed to concentrated sunlight.Sol.Energy Mater.Sol.Cells,2002,73(3):287-303. |
| [19] | Zhang T,Oyama T,Aoshima A,et al.Photooxidative N-demethylation of methylene blue in aqueous TiO2 dispersions under UV irradiation.J.Photochem.Photobiol.A,2001,140(2):163-172. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%