Ag修饰TiO_2的制备及其在模拟太阳光下的光催化性能研究
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摘要
采用溶胶凝胶法制备了不同浓度Ag修饰TiO_2以及纯TiO_2,采用X射线衍射(XRD)、能谱分析(EDS)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)、紫外可见光谱(UV-Vis)、荧光光谱(PL)等测试技术对其进行了系统的表征。结果表明,纯TiO_2为锐钛矿/金红石混晶结构,Ag-TiO_2为锐钛矿结构,Ag加入细化了TiO_2晶粒尺寸,并且抑制了锐钛矿向金红石的转变,Ag元素加入后以单质形式存在。以罗丹明B溶液为目标污染物,研究了样品在模拟太阳光下的光催化性能,实验结果表明,Ag-TiO_2的光催化活性较纯TiO_2有明显提升,4%Ag-TiO_2降解率最高,3 h后对罗丹明B的降解率达到83.3%,比纯TiO_2降解率提高了68.6%,其反应速率常数k为0.00896 min-1,为纯TiO_2的3.12倍。
Ag-modified and pure TiO_2 were prepared via sol-gel method and characterized by XRD,EDS,XPS,SEM,UV-Vis and PL systematically. The results show that the crystal structure of pure TiO_2 is anatase/rutile mix phase and all the Ag-TiO_2 form anatase phase,in which Ag is metallic Ag~0. The crystallite size was refined and the transition from anatase to rutile was inhibited by Ag adding. The Rh B solution was used as target pollutant and the photocatalytic activity of prepared samples under simulated solar light was investigated. The experimental results show that the photocatalytic activity of TiO_2 was enhanced evidently via Ag adding and 4% Ag-TiO_2 exhibits best photocatalytic activity. The degradation of 4% Ag-TiO_2 after 3 h is 83. 3%,which is 1. 68 times higher than that of pure TiO_2. The reaction rate constant k of 4% Ag-TiO_2 is 0. 00896 min-1,which is 3. 12 times higher than that of pure TiO_2.
Ag-modified and pure TiO_2 were prepared via sol-gel method and characterized by XRD,EDS,XPS,SEM,UV-Vis and PL systematically. The results show that the crystal structure of pure TiO_2 is anatase/rutile mix phase and all the Ag-TiO_2 form anatase phase,in which Ag is metallic Ag~0. The crystallite size was refined and the transition from anatase to rutile was inhibited by Ag adding. The Rh B solution was used as target pollutant and the photocatalytic activity of prepared samples under simulated solar light was investigated. The experimental results show that the photocatalytic activity of TiO_2 was enhanced evidently via Ag adding and 4% Ag-TiO_2 exhibits best photocatalytic activity. The degradation of 4% Ag-TiO_2 after 3 h is 83. 3%,which is 1. 68 times higher than that of pure TiO_2. The reaction rate constant k of 4% Ag-TiO_2 is 0. 00896 min-1,which is 3. 12 times higher than that of pure TiO_2.
引文
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[2]高如琴,耿悦,李国亭等.Ag/Ti O2的制备及光催化性能研究[J].人工晶体学报,2016,45(9):2265-2268.
[3]Yao Y C,Dai X R,Hu X Y,et al.Synthesis of Ag-decorated Porous Ti O2Nanowires Through a Sunlight Induced Reduction Method and its Enhanced Photocatalytic Activity[J].Applied Surface Science,2016,387:469-476.
[4]Zhang Y,Wang T,Zhou M,et al.Hydrothermal Preparation of Ag-Ti O2Nanostructures with Exposed{001}/{101}Facets for Enhancing Visible Light Photocatalytic Activity[J].Ceramics International,2017,44(3):3118-3126.
[5]Alalm M G,Tawfik A,Ookawara S.Enhancement of Photocatalytic Activity of Ti O2by Immobilization on Activated Carbon for Degradation of Pharmaceuticals[J].Journal of Environmental Chemical Engineering,2016,4(2):1929-1937.
[6]黄凤萍,张双,王帅,等.稀土Nd掺杂纳米Ti O2的制备及光催化活性探讨[J].硅酸盐通报,2014,33(7):1643-1648.
[7]Gao Y P,Fang P F,Chen F T,et al.Enhancement of Stability of N-doped Ti O2Photocatalysts with Ag Loading[J].Applied Surface Science,2013,265(2):796-801.
[8]Govindhan P,Pragathiswaran C.Synthesis and Characterization of Ti O2/Si O2-Ag Nanocomposites Towards Photocatalytic Degradation of Rhodamine B and Methylene Blue[J].Journal of Materials Science Materials in Electronics,2016,27(8):8778-8785.
[9]胡学青.WO3颗粒修饰Ti O2纳米锥的制备及其光催化性能研究[J].人工晶体学报,2015,44(3):764-768.
[10]Shi T T,Hao X Y,Ma J Y,et al.Preparation of Ag2O/Ti O2/Fly-ash Cenospheres Composite Photocatalyst[J].Materials Letters,2016,183:444-447.
[11]Demirci S,Dikici T,Yurddaskal M,et al.Synthesis and Characterization of Ag Doped Ti O2Heterojunction Films and Their Photocatalytic Performances[J].Applied Surface Science,2016,390:796-801.
[12]Wei N,Cui H Z,Song Q,et al.Ag2O Nanoparticle/Ti O2Nanobelt Heterostructures with Remarkable Photo-response and Photocatalytic Properties Under UV,Visible and Near-infrared Irradiation[J].Applied Catalysis B:Environmental,2016,198:83-90.
[13]Lei X F,Xue X X,Yang H.Preparation and Characterization of Ag-doped Ti O2Nanomaterials and Their Photocatalytic Reduction of Cr(VI)Under Visible Light[J].Applied Surface Science,2014,321:396-403.
[14]杨慧娟,邵铭哲,周健兴,等.Ag2O/Ti O2异质结的光催化活性及耐光腐蚀性研究[J].人工晶体学报,2017,46(2):243-250.
[15]Spurr R A,Myers H.Quantitative Analysis of Anatase-Rutile Mixtures with an X-Ray Diffractometer[J].Analytical Chemistry,1957,29(5):760-762.
[16]Uvarov V,Popov I.Metrological Characterization of X-ray Diffraction Methods for Determination of Crystallite Size in Nano-scale Materials[J].Materials Characterization,2007,58(10):883-891.
[17]Cao Y S,Shi T Y,Tang T.Preparation of Ag-doped Ti O2Nanoparticles for Photocatalytic Degradation of Acetamiprid in Water[J].Journal of ChemicalTechnologyandBiotechnology,2008,83(4):546-552.
[18]方奕文,余林,叶飞,等.Ag改性Ti O2催化剂的制备、表征及其甲苯气相光催化降解性能[J].分子催化,2011,25(6):569-573.
[19]冯黛丽,冯妍卉,袁思伟,等.颗粒团聚对纳米尺度熔化行为的影响[J].工程热物理学报,2015,36(2):397-401.
[20]张莹,燕宁宁,朱忠其,等.Ag-Ti O2光催化剂的制备、性能及机理研究[J].功能材料,2013,44(2):172-176.
[21]许平昌,柳阳,魏建红,等.溶剂热法制备Ag/Ti O2纳米材料及其光催化性能[J].物理化学学报,2010,26(8):2261-2266.
[22]Gao Q,Wu X M,Ma Y H,et al.Effect of Sn4+Doping on the Photoactivity Inhibitionand Near Infrared Reflectance Property of Mica-titania Pigments for a Solar Reflective Coating[J].Ceramics International,2016,42(15):17148-17153.
[23]Yin H Y,Wang X L,Wang L,et al.Ag/Ag Cl Modified Self-doped Ti O2Hollow Sphere with Enhanced Visible Light Photocatalytic Activity[J].Journal of Alloys and Compounds,2016,657(5):44-52.
[24]Shafaei A,Nikazar M,Arami M.Photocatalytic Degradation of Terephthalic Acid Using Titania and Zinc Oxide Photocatalysts:Comparative Study[J].Desalination,2010,252(1):8-16.