Bi_2O_3/Bi_2WO_6异质结的构建及其光催化降解性能
摘要
经由水热反应制备Bi_2O_3/Bi_2WO_6异质结.随后,通过XRD、SEM、DRS等手段对该异质结的晶相结构、形貌、光吸收范围等进行表征.实验结果表明当Bi_2O_3的负载量为10 wt%,可见光照射40 min的条件下,Bi_2O_3/Bi_2WO_6异质结催化剂对罗丹明B的降解率最高,可达99.4%.并且在5次重复利用后,异质结催化剂对罗丹明B的光催化降解率仍能达到88.9%,说明催化剂的稳定性很好.Bi_2O_3/Bi_2WO_6异质结的构建加快了光生载流子的分离和迁移,从而增强了光催化活性.此外,我们还提出了可能的光催化机理.
引文
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[2]Qian X F,Yue D T,Tian Z Y,et al.Carbon quantum dots decorated Bi2WO6 nanocomposite with enhanced photocatalytic oxidation activity for VOCs [J].Applied Catalysis B:Environmental,2016,193,16-21.
[3]Irmawati R,Nasriah M N N,Taufiq-Yap Y H,et al.Characterization of bismuth oxide catalysts prepared from bismuth trinitrate pentahydrate:Influence of bismuth concentration [J].Catalysis Today,2004,93-95:701-709.
[4]Lu X,Pu F,Xia Y,et al.Facile fabrication of porous thin films of Bi2O3/Bi2S3 nanocomposite semiconductors at gas/liquid interface and their photoelectrochemical performances [J].Applied Surface Science,2014,299(11):131-135.
[5]Kang S W,Rhee S W.Growth of bismuth oxide films by direct liquid injection-metal organic chemical vapor deposition with Bi (tmhd3 (tmhd:2,2,6,6-tetramethy-3,5-heptanedione) [J].Thin Solid Films,2004,468(1-2):79-83.
[6]Shen B,Yao X,Peng D,et al.Structure and dielectric properties of Bi2O3-ZnO-CaO-Ta2O5 ceramics [J].Ceramics International,2004,30(7):1207-1210.
[7]Zhu G,Que W,Zhang J.Synthesis and photocatalytic performance of Ag-loaded β-Bi2O3 microspheres under visible light irradiation [J].Journal of Alloys & Compounds,2011,509(39):9479-9486.
[8]Li Y Y,Liu J P,Huang X T,et al.Hydrothermal Synthesis of Bi2WO6 Uniform Hierarchical Microspheres [J].Crystal Growth & Design,2007,7(7):1350-1355.
[9]Fang D,Yan Z,Chen M Q.Flowerlike PtCl4/Bi2WO6,composite photocatalyst with enhanced visible-light-induced photocatalytic activity [J].Applied Surface Science,2011,257 (6):1972-1978.
[10]Zhu S,Yang C,Li F,et al.Improved photocatalytic Bi2WO6/BiOCl heterojunctions:One-step synthesis via an ionic-liquid assisted ultrasonic method and first-principles calculations [J].Molecular Catalysis,2017,435:33-48.
[11]Huang H,Cao R,Yu S,et al.Single-unit-cell layer established Bi2WO6 3D hierarchical architectures:Efficient adsorption,photocatalysis and dye-sensitized photoelectrochemical performance [J].Applied Catalysis B:Environmental,2017,219.
[12]Dumrongrojthanath P,Phuruangrat A,Thongtem S,et al.Hydrothermal preparation of visible-light-driven Br-doped Bi2WO6 [J].Materials Letters,2017,209:501-504.
[13]Jiang L B,Yuan X Z,Zeng G M,et al.In-situ synthesis of direct solid-state dual Z-scheme WO3/g-C3N4/Bi2O3 photocatalyst for the degradation of refractory pollutant [J].Applied Catalysis B:Environmental,2018,227:376–385.
[14]Guo Q Y,Huang Y F,Xu H,et al.The effects of solvent on photocatalytic properties of Bi2WO6/TiO2 heterojunction under visible light irradiation [J].Solid State Sciences,2018,78:95-106.
[15]杨水金,邹晨涛,王俊杰.Fe3+/Bi2MoO6光催化剂的制备及其光催化性能研究[J].徐州工程学院学报,2018,33(4):33-38.