首先利用水热法制备了由纳米片组装的粒径为1.5–2μm的Bi2WO6微球,然后在微球表面沉积了不同含量的AgCl (5 wt%,10wt%,20wt%,30wt%),制备了异质结构AgCl/Bi2WO6微球光催化剂.利用X射线粉末衍射、扫描电镜、透射电镜、红外光谱、紫外-可见漫反射吸收等手段对所制的光催化剂进行表征,并以紫外光和可见光分别为光源,罗丹明B为降解对象测试了其光催化活性,考察复合不同含量的AgCl对Bi2WO6光催化剂的性能影响.结果表明,沉积AgCl对Bi2WO6的晶体结构、表面性能和光吸收性能没有产生明显影响,但大幅度提高了Bi2WO6的紫外和可见光催化活性.当复合20wt%AgCl时, AgCl/Bi2WO6光催化活性最佳,紫外光下比纯Bi2WO6提高了2.2倍,可见光下提高了1倍.这主要是由于形成的AgCl/Bi2WO6异质结能有效抑制光生电子和空穴的复合,从而提了其光催化性能.
Bi2WO6 microspheres with a diameter of 1.5–2 μm were prepared by a hydrothermal method, and then coated with different contents of AgCl to form heterostructured AgCl/Bi2WO6 microspheres. The prepared Bi2WO6 and AgCl/Bi2WO6 photocatalysts were characterized by X-ray diffraction, N2 physical adsorption, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, and ultraviolet-visible diffuse reflectance spectroscopy. The pho-tocatalytic activity of the catalysts was evaluated by photocatalytic degradation of rhodamine B under ultraviolet and visible light irradiation. Results showed that the deposition of AgCl had no obvious effect on the light absorption and surface properties of Bi2WO6. However, the heterostruc-tured AgCl/Bi2WO6 photocatalysts exhibited considerably higher activity than the pure AgCl and Bi2WO6 catalysts. With the optimal AgCl content of 20 wt%, the photocatalytic activity of the hetero-structured AgCl/Bi2WO6 catalyst was increased under both ultraviolet and visible light compared with that of Bi2WO6. The main reason for the enhanced photocatalytic activity is attributed to the formation of AgCl/Bi2WO6 heterostructures effectively suppressing the recombination of photo-generated electrons and holes.
参考文献
| [1] | 赫荣安,曹少文,周鹏,余家国.可见光铋系光催化剂的研究进展[J].催化学报,2014(07):989-1007. |
| [2] | Yu C L;Wei L F;Zhou W Q;Chen J C Fan Q Z Liu H .[J].Application Surface Sinence,2014,319:312. |
| [3] | Bian Z F;Cao F L;Zhu J;Li H X .[J].Environmental Science and Technology,2015,49:2418. |
| [4] | Xu D F;Cheng B;Cao S W;Yu J G .[J].Applied Catalysis B:Environmental,2015,164:380. |
| [5] | 余长林,陈建钗,操芳芳,李鑫,樊启哲,YU Jimmy C,魏龙福.Pt/BiOCl纳米片的制备、表征及其光催化性能[J].催化学报,2013(02):385-390. |
| [6] | Wang P;Ming T S;Wang G H;Wang X F Yu H G Yu J G .[J].Journal of Molecular Catalysis A:Chemical,2014,381:114. |
| [7] | Tang J W;Zou Z G;Ye J H .[J].Catalysis Letters,2004,92:53. |
| [8] | Liu Y M;Lv H;Hu J Y;Li Z J .[J].Materials Letters,2015,139:401. |
| [9] | Liu L;Wang Y F;An W J;Hu J S Cui W Q Liang Y H .[J].Journal of Molecular Catalysis A:Chemical,2014,394:309. |
| [10] | Zhao G;Liu S W;Lu Q F;Xu F X Sun H Y .[J].Journal of Alloys and Compounds,2013,578:12. |
| [11] | Li Y;Liu J;Huang X;Li G .[J].Crystal growth and design,2007,7:1350. |
| [12] | 刘瑛,王为民,傅正义,王皓,王玉成,张金咏.Bi2WO6的水热合成及其光催化性能研究[J].无机材料学报,2011(11):1169-1174. |
| [13] | Zhang L W;Wang Y J;Cheng H Y;Yao W Q,Zhu Y F .[J].Advanced Materials,2009,21:1286. |
| [14] | Zhang LS;Wang WZ;Zhou L;Xu HL .Bi2WO6 nano- and microstructures: Shape control and associated visible-light-driven photocatalytic activities[J].Small,2007(9):1618-1625. |
| [15] | Yu C L;Cao F F;Li X;Li G Xie Y Yu J C Shu Q Fan Q Z Chen J C .[J].CHEMICAL ENGINEERING JOURNAL,2013,219:86. |
| [16] | Li XZ.;Liu H. .Photocatalytic oxidation using a new catalyst - TiO2 microsphere - for water and wastewater treatment[J].Environmental Science & Technology: ES&T,2003(17):3989-3994. |
| [17] | Yu C L;Yang K;Xie Y;Fan Q Z Yu J C Shu Q Wang C Y .[J].Nanoscale,2013,5:2142. |
| [18] | Yang J H;Wang D E;Han H X;Li C .[J].Accounts of Chemical Research,2013,46:1900. |
| [19] | Yu C L;Fan C F;Yu J C;Zhou W Q Yang K .[J].Materials Research Bulletin,2011,46:140. |
| [20] | 余长林,杨凯,舒庆,YU Jimmy C,操芳芳,李鑫.WO3/ZnO复合光催化剂的制备及其光催化性能[J].催化学报,2011(04):555-565. |
| [21] | Yu C L;Li G;Kumar S;Yang K Jin R C .[J].Advanced Materials,2014,26:892. |
| [22] | Gao L;Zheng S;Zhang Q H.Nano TiO2 Photocatalytic Materials and Their Application[M].北京:化学工业出版社,2002:110. |
| [23] | 余长林,周晚琴,余济美,刘鸿,魏龙福.设计和制备能量转换和环境净化的高效异质结光催化剂[J].催化学报,2014(10):1609-1618. |
| [24] | Dai G P;Yu J G;Liu G .[J].J Phys Chem C,2011,115:7339. |
| [25] | Fu HB;Zhang LW;Yao WQ;Zhu YF .Photocatalytic properties of nanosized Bi2WO6 catalysts synthesized via a hydrothermal process[J].Applied Catalysis, B. Environmental: An International Journal Devoted to Catalytic Science and Its Applications,2006(1/2):100-110. |
| [26] | Zhu S B;Xu T G;Fu H B;Zhao J C Zhu Y F .[J].Environmental Science and Technology,2007,41:6234. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%