不同形貌WO_3的制备及其可见光催化性能研究
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摘要
采用直接微调pH的方法成功制备了WO_3棒、WO_3阵列和WO_3花三种形貌,并对其进行了TEM、XRD、Raman、FT-IR、N_2吸附-脱附、UV-Vis等表征。结果发现三种形貌中WO_3棒和WO_3阵列具有相同的晶型,且WO_3阵列的比表面积最大(18. 6 m~2/g),禁带宽度E_g最小,因此在可见光催化降解亚甲基蓝(MB)的实验中,WO_3阵列表现出了最高的催化活性,60 min后降解效率达到95%,表观反应速率常数k值达到4. 676×10~(-2),此值分别为WO_3花和WO_3棒k值的1. 55倍和2. 19倍。
WO_3 rods,arrays and flowers were successfully prepared by fine changing the p H values directly,and the products were characterized by TEM,XRD,Raman,FT-IR,N_2 adsorption-desorption and UV-Vis spectrum. The results showed that the WO_3 rods and WO_3 arrays have the same crystal phase in three morphologies,and the WO_3 arrays possess the biggest specific surface area( 18. 6 m~2/g) and smallest bandgap( Eg). And thus the WO_3 arrays show the best performance in catalytic degradation of methylene blue( MB) under visible light. Its degradation efficiency could reach 95% in 60 min,and the apparent rate constant(k) of reaction accordingly reachs to 4. 676 × 10~(-2),which is 1. 55 and 2. 19 times for that of WO_3 rods and flowers.
WO_3 rods,arrays and flowers were successfully prepared by fine changing the p H values directly,and the products were characterized by TEM,XRD,Raman,FT-IR,N_2 adsorption-desorption and UV-Vis spectrum. The results showed that the WO_3 rods and WO_3 arrays have the same crystal phase in three morphologies,and the WO_3 arrays possess the biggest specific surface area( 18. 6 m~2/g) and smallest bandgap( Eg). And thus the WO_3 arrays show the best performance in catalytic degradation of methylene blue( MB) under visible light. Its degradation efficiency could reach 95% in 60 min,and the apparent rate constant(k) of reaction accordingly reachs to 4. 676 × 10~(-2),which is 1. 55 and 2. 19 times for that of WO_3 rods and flowers.
引文
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[2]Byrne C,Subramanian G,Pillai S C.Recent Advances in Photocatalysis for Environmental Applications[J].Journal of Environmental Chemical Engineering,2018,6:3531-3555.
[3]Li X L,Lou T J,Sun X M,et al.Highly Sensitive WO3 Hollow-Sphere Gas Sensors[J].Inorganic Chemistry,2004,43(17):5442-5449.
[4]Bechinger C,Wirth E,Leiderer P.Photochromic Coloration of WO3 with Visible Light[J].Applied Physics Letters,1996,68(20):2834-2836.
[5]Lee S H,Deshpande R,Parilla P A,et al.Crystalline WO3 Nanoparticles for Highly Improved Electrochromic Applications[J].Advanced Materials,2006,18:763-766.
[6]Zhao Z G,Miyauchi M.Nanoporous-Walled Tungsten Oxide Nanotubes as Highly Active Visible-Light-Driven Photocatalysts[J].Angewandte Chemie International Edition,2008,47:7051-7055.
[7]Liu B,Wang J,Li H,et al.Facile Synthesis of Hierarchical Hollow Mesoporous Ag/WO3 Spheres with High Photocatalytic Pperformance[J].Journal of Nanoscience and Nanotechnology,2013,13:4117-4122.
[8]Wang Y,Wang X,Xu Y,et al.Simultaneous Synthesis of WO3 -xQuantum Dots and Bundle-Like Nanowires Using a One-Pot Template-Free Solvothermal Strategy and Their Versatile Applications[J].Small,2017,13:1603689-1603699.
[9]Choi H G,Jung Y H,Kim D K.Solvothermal Synthesis of Tungsten Oxide Nanorod/Nanowire/Nanosheet[J].J.Am.Ceram.Soc.,2005,88(6):1684-1686.
[10]Aslam I,Cao C,Waheed S K,et al.Synthesis of Three-Dimensional WO3 Octahedra:Characterization,Optical and Efficient Photocatalytic Properties[J].RSC Advances,2014,4:37914-37920.
[11]Gibot P,Comet M,Vidal L,et al.Synthesis of WO3 Nanoparticles for Superthermites by the Template Method from Silica Spheres[J].Solid State Sciences,2011,13:908-914.
[12]Sasidharan M,Gunawardhana N,Yoshio M,et al.WO3 Hollow Nanospheres for High-Lithium Storage Capacity and Good Cyclability[J].Nano Energy,2012,1:503-508.
[13]Gu Z,Zhai T,Gao B,et al.Controllable Assembly of WO3 Nanorods-Nanowires into Hierarchical Nanostructures[J].Journal of Physical Chemistry B,2006,110:23829-23836.
[14]Sun S,Wang W,Zeng S,et al.Preparation of Ordered Mesoporous Ag/WO3 and Its Highly Efficient Degradation of Acetaldehyde under VisibleLight Irradiation[J].Journal of Hazardous Materials,2010,178:427-433.
[15]Abe R,Takami H,Murakami N,et al.Pristine Simple Oxides as Visible Light Driven Photocatalysts:Highly Efficient Decomposition of Organic Compounds over Platinum-Loaded Tungsten Oxide[J].Journal of the American Chemical Society,2008,130:7780-7781.
[16]Irie H,Miura S,Kamiya K,et al.Efficient Visible Light-Sensitive Photocatalysts:Grafting Cu(II)Ions onto Ti O2and WO3 Photocatalysts[J].Chemical Physics Letters,2008,457:202-205.
[17]Mu W,Li M,Li X,et al.Guanidine Sulfate-Assisted Synthesis of Hexagonal WO3 Nanoparticles with Enhanced Adsorption Properties[J].Dalton Transactions,2015,44:7419-7427.
[18]Ha J H,Muralidharan P,Kim D K.Hydrothermal Synthesis and Characterization of Self-assembled h-WO3 Nanowires/Nanorods Using EDTASalts[J].Journal of Alloys and Compounds,2009,475:446-451.
[19]Salmaoui S,Sediri F,Gharbi N.Characterization of h-WO3 Nanorods Synthesized by Hydrothermal Process[J].Polyhedron,2010,29:1771-1775.
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