水热法制备V~(5+)掺杂钼酸铋光催化剂及其性能研究
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摘要
以硝酸铋和钼酸铵为反应原料,V2O5为掺杂源,采用水热法制备V5+掺杂钼酸铋光催化剂,并通过在可见光下光催化剂降解罗丹明B溶液,评价V5+掺杂对钼酸铋性能的影响。采用X射线衍射(XRD)、扫描电镜(SEM)、X射线光电子能谱仪(XPS)及光致发光(PL)表征手段来考察掺杂量对钼酸铋物相、晶貌尺寸、结晶度、光吸收性能、光生电子-空穴复合等的影响。结果表明,掺杂V5+未改变钼酸铋的片状形貌,但其片状尺寸明显变小且厚度变薄,光吸收性能增强,光生电子-空穴复合率下降;与纯钼酸铋相比,V5+掺杂能显著提高钼酸铋的光催化活性,在可见光光照50min后,1. 0%V5+掺杂的效果最好,对罗丹明B的脱色率可达73%,较之纯钼酸铋提高了21%。
V~(5+)doped Bi_2MoO_6 photocatalyst was prepared by hydrothermal method with bismuth nitrate and ammonium molybdate as rawmaterials and V2 O5 as doping source. The effect of V~(5+)dopig on the photocatalytic performanceof Bi_2MoO_6 was determined through the photodegradation of Rhodamine B solution under visible light. Several techniques,including X-ray diffraction( XRD),scanning electron microscopy( SEM),X-ray photoelectron spectroscopy( XPS),and photoluminescence( PL) characterization methods were used to investigate the effect of V~(5+)doping on the phase,crystallite size,light absorption properties,photoelectron-hole recombinationof the bismuth molybdate. The results showthat the doping of V~(5+)did not change the structure and the sheet morphology of bismuth molybdate,but enhanced the light absorption performance and decreased the photoelectron-hole recombination rate as compared with pure Bi_2MoO_6.Bi_2MoO_6 with 1. 0% V~(5+)doping exhibited the highest photocatalytic activity with the degradation rate of rhodamine B( Rh B) being 73%,which is21% higher than that of pure Bi_2MoO_6.
V~(5+)doped Bi_2MoO_6 photocatalyst was prepared by hydrothermal method with bismuth nitrate and ammonium molybdate as rawmaterials and V2 O5 as doping source. The effect of V~(5+)dopig on the photocatalytic performanceof Bi_2MoO_6 was determined through the photodegradation of Rhodamine B solution under visible light. Several techniques,including X-ray diffraction( XRD),scanning electron microscopy( SEM),X-ray photoelectron spectroscopy( XPS),and photoluminescence( PL) characterization methods were used to investigate the effect of V~(5+)doping on the phase,crystallite size,light absorption properties,photoelectron-hole recombinationof the bismuth molybdate. The results showthat the doping of V~(5+)did not change the structure and the sheet morphology of bismuth molybdate,but enhanced the light absorption performance and decreased the photoelectron-hole recombination rate as compared with pure Bi_2MoO_6.Bi_2MoO_6 with 1. 0% V~(5+)doping exhibited the highest photocatalytic activity with the degradation rate of rhodamine B( Rh B) being 73%,which is21% higher than that of pure Bi_2MoO_6.
引文
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[3] Yuchen Hao,Xiaoli Dong,Shangru Zhai. et al. Hydrogenated Bismuth M olybdate Nanoframe for Efficient Sunlight-Driven Nitrogen Fixation from Air[J].Chemistry-A European Journal,2016,22(52):18722-18728.
[4] Nguyen Thanh-Binh,Jean-Luc Dubois,Serge Kaliaguine. Ammoxidation of acrolein to acrylonitrile over bismuth molybdate catalysts Applied Catalysis A[J].General,2016,520:7-12.
[5] Sittikorn Jonjana,Anukorn Phuruangrat,Titipun Thongtem,et al. Synthesis,analysis and photocatalysis of AgBr/Bi2MoO6nanocomposites[J]. 2016,172:11-14.
[6] Jie Zhao,Zhendong Liu,Qifang Lu. Electrospun 1D SiO2doped Bi2M oO6microbelts for highly efficient photocatalytic applications[J]. Dyes and Pigments,2016,134:553-561.
[7]强小丹,高春燕,王丹军,等. Fe3+掺杂Bi2M oO6光催化剂的合成及其活性研究[J].应用化工,2012,4(9):1553-1556.
[8] A. A. Alemi,R. Kashfi,B. Shabani. Preparation and characterization of novel Ln(Gd3+,Ho3+and Yb3+)-doped Bi2M oO6w ith Aurivillius layered structures and photocatalytic activities under visible light irradiation[J]. Journal of Molecular Catalysis A:Chemical,2014,392:290-298.
[9] Xing Ding,WingKei Ho,Jian Shang,et al. Self doping promoted photocatalytic removal of no under visible light w ith Bi2M oO6:Indispensable role of superoxide ions[J]. Applied Catalysis B:Environmental,2016,182:316-325.
[10] Shengyao Wang,Xianglong Yang,Xuehao Zhang,et al. A plate-on-plate sandw iched Z-scheme heterojunction photocatalyst:BiOBr-Bi2M oO6w ith enhanced photocatalytic performance[J]. Applied Surface Science,2017,391:194-201.
[11] Zhijie Zhang,Tingting Zheng,Jiayue Xu,et al. Carbon quantum dots/Bi2M oO6composites w ith photocatalytic H2evolution and near infrared activity[J]. Journal of Photochemistry and Photobiology A:Chemistry,2017,346:24-31.
[12] Zuoshan Wang,Shala Bi,Yingpeng Wan,et al. Optical properties of a new Bi38M o7O78semiconductor w ith fluorite-typeδ-Bi2O3structure[J]. Applied Surface Science,2017,399:506-514.
[13]徐鹏,李佑稷,刘晨,等.钒掺杂介孔二氧化钛的制备及可见光催化性[J].高等学校化学学报,2014,35(9):1954-1961.
[14] Rajesh Adhikari,Gobinda Gyawali,Sung Hun Cho,R. et al. Er3+/Yb3+co-doped bismuth molybdate nanosheets upconversion photocatalyst with enhanced photocatalytic activity[J]. Journal of Solid State Chemistry,2014,209:74-81.
[15] Rajesh Adhikari,Bhupendra Joshi,R. Narro-García,et al. M icrow ave hydrothermal synthesis and infrared to visible upconversion luminescence of Er3+/Yb3+codoped bismuth molybdate nanopow der,[J]. Journal of Luminescence,2014,145:866-871.
[16]刘昱君.钼酸铋的制备、表征及其降解污染物性能的研究[D].大连:大连海事大学,2017:9-13.