Ag纳米颗粒修饰对La掺杂ZnO纳米棒光催化性能的影响

兰州理工大学学报 ›› 2021, Vol. 47 ›› Issue (1): 28-35.

Ag纳米颗粒修饰对La掺杂ZnO纳米棒光催化性能的影响

于富成, 南冬梅, 王博龙, 李圆梦, 刘正艳, 何玲

兰州理工大学材料科学与工程学院, 甘肃兰州 730050

收稿日期:2020-07-04 出版日期:2021-02-28 发布日期:2021-03-11
作者简介:于富成(1972-),男,辽宁庄河人,博士,副教授.

The effect of Ag nanoparticles modification on photocatalytic properties of La-doped ZnO nanorods

YU Fu-cheng, NAN Dong-mei, WANG Bo-long, LI Yuan-meng, LIU Zheng-yan, HE Ling

College of Materials Science and Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, China

Received:2020-07-04 Online:2021-02-28 Published:2021-03-11

摘要/Abstract

摘要： 采用水热法和光沉积制备Ag纳米颗粒修饰的La掺杂ZnO纳米棒,并通过光催化降解甲基橙(MO)溶液,考查了La掺杂浓度和Ag修饰对ZnO纳米棒光催化性能的影响.结果表明:La掺杂和Ag修饰能够提高ZnO纳米棒的光催化性能.La掺杂改变了ZnO纳米棒的结晶质量,La—O键的形成使ZnO晶体的本征吸收边红移且吸收强度增加,同时,La掺杂可提高ZnO电子浓度和形成杂质能级,Ag纳米颗粒的修饰提高了La掺杂ZnO光生电子与空穴对的分离效率,增加了载流子的寿命.与纯ZnO纳米棒相比,La掺杂和Ag修饰的ZnO纳米棒表现出良好的光催化性能.

关键词: 水热法, La掺杂ZnO棒, Ag纳米颗粒修饰, 光催化

Abstract: Ag nanoparticles decorated by La-doped ZnO nanorods were prepared in this study by hydrothermal method followed by a photo-deposition process. Effects of La-doping content and Ag modification on the photocatalytic performance of ZnO nanorods were investigated by photocatalytic degradation of methyl orange (MO) solution. The experiment results show that the photocatalytic performance of ZnO nanorods is much enhanced by La-doping and the decoration of Ag nanoparticles. La-doping changes the crystal quality, and the formed La—O bond makes the intrinsic absorption edge red-shift and increases the absorption intensity. Simultaneously, La-doping improves the electron concentration and impurity level of ZnO crystal. The decoration of Ag nanoparticles on the surface of La-doped ZnO nanorods inhibits the recombination of photo-generated electrons and holes, and the exciton life is thereby prolonged. Ag decorated La-doped ZnO nanorods show more effective photocatalytic performance than that of pure ZnO nanorods.

Key words: Hydrothermal method, La-doped ZnO nanorods, Ag nanoparticles decoration, photocatalysis

中图分类号:

TB34

于富成, 南冬梅, 王博龙, 李圆梦, 刘正艳, 何玲. Ag纳米颗粒修饰对La掺杂ZnO纳米棒光催化性能的影响[J]. 兰州理工大学学报, 2021, 47(1): 28-35.

YU Fu-cheng, NAN Dong-mei, WANG Bo-long, LI Yuan-meng, LIU Zheng-yan, HE Ling. The effect of Ag nanoparticles modification on photocatalytic properties of La-doped ZnO nanorods[J]. Journal of Lanzhou University of Technology, 2021, 47(1): 28-35.

参考文献

[1] LIU Wen,SUN Weiling,BORTHWICK G L,et al.Simultaneous removal of Cr(Ⅵ) and 4-chlorophenol through photocatalysis by a novel anatase/titanate nanosheet composite:Synergetic promotion effect and autosynchronous doping[J].J Hazard Mater,2016,317:385-393.
[2] DING Wenqiang,ZHAO Lidan,YAN Hongguang,et al.Bovine serum albumin assisted synthesis of Ag/Ag₂O/ZnO photocatalyst with enhanced photocatalytic activity under visible light[J].Colloids and Surfaces A,2018,88:277-285.
[3] WANG Yuxin,YANG Yiqiong,XI Limin,et al.A simple hydrothermal synthesis of flower-like ZnO microspheres and their improved photocatalytic activity[J].Materials Letters,2016,180:55-58.
[4] 于富成,宋天云,许博宇,等.CuO包覆ZnO颗粒的光催化性能[J].兰州理工大学学报,2019,45(4):22-26.
[5] VERMA K C,KOTNALA R K.Oxygen vacancy induced by La and Fe into ZnO nanoparticles to modify ferromagnetic ordering[J].Journal of Solid State Chemistry,2016,237:211-218.
[6] QIN Rui,MENG Fanming,Muhammad Wasim Khan,et al.Fabrication and enhanced photocatalytic property of TiO₂-ZnO composite photocatalysts[J].Materials Letters,2019,240:84-87.
[7] YU Fucheng,Hu Hailong,WANG Bolong,et al.Effects of Al doping on defect behaviors of ZnO thin film as a photocatalyst[J].Materials Science-Poland,2019,37(3):437-445.
[8] SAHIL GOEL,NIDHI SINHA,HARSH YADAV,et al.Experimental investigation on the structural,dielectric,ferroelectric and piezoelectric properties of La doped ZnO nanoparticles and their application in dye-sensitized solar cells[J].Physica E:Low-dimensional Systems and Nanostructures,2017,91:72-81.
[9] WANG Bolong,YU Fucheng,LI Haishan,et al.The preparation and photocatalytic properties of Na doped ZnO porous flm composited with Ag nano-sheets[J].Physica E:Low-dimensional Systems and Nanostructures,2020,117:113712.
[10] INTARASUWAN K,AMORNPITOKSUK P,SUWANBOON S,et al.Effect of Ag loading on activated carbon doped ZnO for bisphenol a degradation under visible light[J].Advaced Powder Technology,2018,29(11):2608-2615.
[11] CHITHIRA P R,TENY T J.Correlation among oxygen vacancy and doping concentrationin controlling the properties of cobalt doped ZnO nanoparticles[J].Journal of Magnetism and Magnetic Materials,2020,496:165928.
[12] LIU Yangsi,GAO Wei,ZHANG Chao,et al.In situ formation of Ag/ZnO heterostructure arrays during synergistic photocatalytic process for SERS and photocatalysis[J].Journal of the Taiwan Institute of Chemical Engineers,2018,88:277-285.
[13] 于富成,丁会云,耿武,等.Mg掺杂对ZnO纳米棒阵列的形貌及光学性能的影响[J].兰州理工大学学报,2017,43(4):33-36.
[14] LIN Jiajun,LI Shengtao,HE Jinqiang,et al.Zinc interstitial as a universal microscopic origin for the electrical degradation of ZnO-based varistors under the combined DC and temperature condition[J].Journal of the European Ceramic Society,2017,37(11):3535-3540.
[15] STOJADINOVIC S,TADIC N,VASILIC R.Formation andcharacterization of ZnO films on zinc substrate by plasma electrolytic oxidation[J].Surface and Coatings Technology,2016,307:650-657.
[16] TAKAKI H,INOUE S,MATSUMURA.Defects control in the synthesis of low-dimensional zinc oxide[J].Chemical Physics Letters,2017,684:113-116.
[17] KUIRI P K,PRAMANIK S.Large enhancement of UV luminescence emission of ZnO nanoparticles by coupling excitons with Ag surface plasmons[J].Journal of Applied Physics,2018,123(15):1-4.
[18] SUN Yongjiao,ZHAO Zhenting,LI Gang,et al.Synthesis and characterization of Ag@ZnO nanostructure for photocatalytic degradation of rhodamine B:influence of calcination temperature and Ag content[J].Applied Physics A,2017,123(2):1-16.
[19] OPPONG S B,ANKU W W,SHUKLA S K.et al.Synthesis and characterisation of neodymium doped-zinc oxide-graphene oxide nanocomposite as a highly efficient photocatalyst for enhanced degradation of indigo carmine in water under simulated solar light[J].Res Chem Intermediat,2017,43(1):481-501.
[20] HIMANSHU R,SUPARNA B,PRANAYEE D.Photocatalytic activity of Ag/ZnO core-shell nanoparticles with shell thickness as controlling parameter under green environment[J].Materials Research Express,2017,4(2):1-16.