Bi_2O_3/Bi_2WO_6异质结光催化剂的制备及其活性
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摘要
采用一步水热法,制备了具有高效光催化活性的Bi_2O_3/Bi_2WO_6异质结催化剂。利用X射线衍射(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线光电子能谱(XPS)和N_2物理吸附(BET)等技术对催化剂样品进行表征,分析了不同Bi_2O_3负载量Bi_2O_3/Bi_2WO_6催化剂样品的催化活性并进行了光催化机理探究。结果表明:Bi_2O_3/Bi_2WO_6具有典型的异质结构,Bi_2O_3负载于Bi_2WO_6片层结构的表面,两者紧密结合并且没有破坏彼此的物相结构;相比于单体Bi_2WO_6,Bi_2O_3/Bi_2WO_6能有效促进光生电子和空穴的分离,其禁带宽度仅为2.47eV,具有良好的可见光吸收性能。模拟太阳光活性考察,2h内Bi_2O_3摩尔分数10%的Bi_2O_3/Bi_2WO_6对10mg/L罗丹明B溶液光降解效率可高达91.1%。
A series of Bi_2O_3-containing Bi_2WO_6 catalysts were prepared by one-step hydrothermal synthesis method.The catalytic activity of different Bi_2O_3-loaded samples and the photocatalytic mechanism were analyzed by XRD,SEM,TEM,XPS and BET techniques.Results show that Bi_2O_3/Bi_2WO_6 is of typical heterostructure.Bi_2O_3 locates on the surface of the Bi_2WO_6 sheet structure,and these two phases are in close contact without breaking the phase structure of each other.Compared with the monomer Bi_2WO_6,Bi_2O_3/Bi_2WO_6 shows promising performance in the separation of photogenerated electrons and holes,with the band gap of only 2.47 eV,which has good absorption properties of visible light.Under visible-light irradiation,the photodegradation rate of RhB(10mg/L)is 91.1% on Bi_2O_3/Bi_2WO_6 with 10% molar fraction of Bi_2O_3 for 2h.
A series of Bi_2O_3-containing Bi_2WO_6 catalysts were prepared by one-step hydrothermal synthesis method.The catalytic activity of different Bi_2O_3-loaded samples and the photocatalytic mechanism were analyzed by XRD,SEM,TEM,XPS and BET techniques.Results show that Bi_2O_3/Bi_2WO_6 is of typical heterostructure.Bi_2O_3 locates on the surface of the Bi_2WO_6 sheet structure,and these two phases are in close contact without breaking the phase structure of each other.Compared with the monomer Bi_2WO_6,Bi_2O_3/Bi_2WO_6 shows promising performance in the separation of photogenerated electrons and holes,with the band gap of only 2.47 eV,which has good absorption properties of visible light.Under visible-light irradiation,the photodegradation rate of RhB(10mg/L)is 91.1% on Bi_2O_3/Bi_2WO_6 with 10% molar fraction of Bi_2O_3 for 2h.
引文
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[3]NAKATA K,FUJISHIMA A.TiO2,photocatalysis:Design and applications[J].Journal of Photochemistry&Photobiology C Photochemistry Reviews,2012,13(3):169-189.
[4]SHI J,CHEN J,FENG Z,et al.Photoluminescence characteristics of TiO2 and their relationship to the photoassisted reaction of water/methanol mixture[J].Journal of Physical Chemistry C,2017,111(2):693-699.
[5]邢光建,李钰梅,赵铮,等.不同形貌的钨酸铋纳米材料的制备及其光催化性能[J].人工晶体学报,2010,39(5):1265-1271.(XING Guangjian,LI Yumei,ZHAO Zheng,et al.Preparation and photocatalytic properties of bismuth tungsten oxide nanomaterials with different morphologies[J].Journal of Synthetic Crystals,2010,39(5):1265-1271.)
[6]GAO E,WANG W,SHANG M,et al.Synthesis and enhanced photocatalytic performance of grapheneBi2WO6 composite[J].Physical Chemistry Chemical Physics,2011,13(7):2887-2893.
[7]唐洁,展红全,江向平,等.不同酸性助剂水热合成钨酸铋的制备及光催化性能研究[J].人工晶体学报,2013,42(6):1092-1097.(TANG Jie,ZHANHongquan,JIANG Xiangping,et al.Preparation and photocatalytic activity of Bi2WO6 by hydrothermal method with differrent acid-assited[J].Journal of Synthetic Crystals,2013,42(6):1092-1097.)
[8]TAKEDA H,NISHIDA T,OKAMURA S,et al.Crystal growth of bismuth tungstate Bi2WO6,by slow cooling method using borate fluxes[J].Journal of the European Ceramic Society,2005,25(12):2731-2734.
[9]冯翔,史非,刘敬肖,等.WO3-TiO2复合光催化材料的水热合成及其光催化性能[J].材料导报,2013,27(22):37-40.(FENG Xiang,SHI Fei,LIU Jingxiao,et al.Hydrothermal synthesis and photocatalytic activity of WO3-TiO2 composite photocatalyst[J].Materials Review,2013,27(22):37-40.)
[10]SHANG M,WANG W,ZHANG L,et al.3DBi2WO6/TiO2hierarchical heterostructure:Controllable synthesis and enhanced visible photocatalytic degradation performances[J].J Phys Chem C,2009,113(33):14727-14731.
[11]邱明艳,张天永,李彬,等.异质结纳米光催化材料研究进展[J].材料导报,2012,25(5):48-51.(QIUMingyan,ZHANG Tianyong,LI Bin,et al.Recent research progress on heterostructure nanophotocatalysts[J].Materials Review,2012,25(5):48-51.)
[12]LI Z Q,CHEN X T,XUE Z L.Microwave-assisted synthesis and photocatalytic properties of flower-like Bi2WO6and Bi2O3-Bi2WO6 composite[J].Journal of Colloid&Interface Science,2013,394(4):69-77.
[13]PENG Y,YAN M,CHEN Q G,et al.Novel onedimensional Bi2O3-Bi2WO6 p-n hierarchical heterojunction with enhanced photocatalytic activity[J].Journal of Materials Chemistry A,2014,2(22):8517-8524.
[14]ZHANG N,CIRIMINNA R,PAGLIARO M,et al.Nanochemistry-derived Bi2WO6 nanostructures:Towards production of sustainable chemicals and fuels induced by visible light[J].Chemical Society Reviews,2015,45(38):5276-5287.
[15]BIAN Zhenfeng,ZHU J,WANG Shaohua,et al.Selfassembly of active Bi2O3/TiO2visible photocatalyst with ordered mesoporous structure and highly crystallized anatase[J].Journal of Physical Chemistry C,2008,112(16):6258-6262.
[16]KUVAREGA A T,RUI W M K,MAMBA B B.Nitrogen/palladium-codoped TiO2 for efficient visible light photocatalytic dye degradation[J].Journal of Physical Chemistry C,2011,115(45):22110-22120.
[17]HE Z,SHI Y,GAO C,et al.BiOCl/BiVO4 p-n heterojunction with enhanced photocatalytic activity under visible-light irradiation[J].Journal of Physical Chemistry C,2014,118(1):389-398.
[18]CHOI H,STATHATOS E,DIONYSIOU D D.Photocatalytic TiO2 films and membranes for the development of efficient wastewater treatment and reuse systems[J].Desalination,2015,202(1):199-206.
[19]XU C,WEI X,REN Z,et al.Solvothermal preparation of Bi2WO6 nanocrystals with improved visible light photocatalytic activity[J].Materials Letters,2009,63(26):2194-2197.
[20]TIAN Y,CHANG B,LU J,et al.Hydrothermal synthesis of graphitic carbon nitride-Bi2WO6heterojunctions with enhanced visible light photocatalytic activities[J].Powder Technology,2014,267(15):126-133.
[21]CHANGLIN Y U,YANG K,JIMMY C Y U,et al.Hydrothermal synthesis and photocatalytic performance of Bi2WO6/ZnO heterojunction photocatalysts[J].Journal of Synthetic Crystals,2011,41(1):171-176.