Preparation and Characterization of Visible-light Irradiated TiO2/Bi4Ti3O12 Composite Powder
-
摘要: 以熔盐法制备的微米级片状Bi4Ti3O12为基体, 采用Ti(SO4)2水解结合后续热处理的方法制备了TiO2/Bi4Ti3O12复合粉, 研究了原料配比对复合粉晶体结构、形貌以及光催化降解脱色效果的影响。结果表明:该复合粉的形貌为微米级片状Bi4Ti3O12表面分布着纳米级的TiO2颗粒; 当原料中铋、钛物质的量比低于1∶6时, 复合粉对亚甲基蓝具有良好的吸附脱色效果, 钛含量过多时会导致水解产物的团聚, 降低复合粉的比表面积, 使其脱色效果变差; 当铋、钛物质的量比为1∶4时, 复合粉的比表面积为13.444 m2·g-1, 可见光光照4 h以内, 对亚甲基蓝的脱色率达到85%, 其光催化降解脱色速率高于Bi4Ti3O12的。
-
关键词:
- TiO2/Bi4Ti3O12复合粉 /
- 水解 /
- 可见光 /
- 脱色率
Abstract: With micro-sized Bi4Ti3O12 platelet prepared by molten salt method as the substrate, the TiO2/ Bi4Ti3O12 composite powders were prepared by the hydrolysis of titanium sulfate followed by heat treatment. The effects of raw material ratios on the crystal structure, morphology and photocatalytic degradation/decolorization performance of the composite powders were investigated. The results show that the composite powders showed the morphology of nano-scale TiO2 particles distributing on the surface of micro-scale Bi4Ti3O12 platelets. When the molar ratio of Bi/Ti in raw materials was lower than 1∶6, the adsorption decolorization effect of the composite powder on methylene blue was good. But a relatively high content of Ti could result in the agglomeration of the hydrolysis product and lowered the surface area of the composite powder, leading to the poor decolorization effect. When the molar ratio of Bi/Ti was equal to 1∶4, the BET surface area of the composite powder reached 13.444 m2·g-1, and the methylene blue decolorization rate reached 85% under visible light irradiation in 4 h. The photocatalytic degradation/decolorization rate was higher than that of pure Bi4Ti3O12.-
Keywords:
- TiO2/Bi4Ti3O12 composite powder /
- hydrolysis /
- visible light /
- decolorization rate
-
-
[1] 晏海学, 李承恩, 周家光, 等.高Tc铋层状压电陶瓷结构与性能[J].无机材料学报, 2000,15(2):209-220. [2] 石江涛,王秀峰,于成龙,等.温度及升温速率对熔盐法合成钛酸铋形貌可控的探讨[J].材料导报,2010,24(6): 88-90. [3] JARDIEL T,CABALLERO A C,VILLEGAS M, et al.Aurivillius ceramics: Bi4Ti3O12-based piezoelectrics[J].J Am Ceram Soc,2008,116:511-518. [4] FUJISHIMA A,HONDA K.Electrochemical photolysis of water at a semiconductor electrode[J].Nature,1972,238(5358):37-38. [5] YAO W F,XU X H,WANGH,et al.Photocatalytic property of perovskite bismuth titanate[J].Appl Catal B-Environ,2004,52(2):109-116. [6] WANG F,WANG J B,ZHONG X L,et al.Controllable synthesis and formation mechanism of nano- and micro- structures by a solvothermal method[J].Mater Lett,2014,121:22-25. [7] 杨群保,李永祥,殷庆瑞,等.钛酸铋纳米粉体的水热合成研究[J].无机材料学报,2002,17(6):1135-1140. [8] ZHANG J,BANG J H,TANG C,et al.Tailored TiO2-SrTiO3 heterostructure nanotube arrays for improved photoelectro-chemical performance[J].ACS Nano,2009,4(1):387-395. [9] 陈侃松,黎旸,田寒,等.Bi4Ti3O12/TiO2异质结的制备及其光催化性能[J].材料研究学报,2014,28(7):503-508. [10] 关凯书, 白皓然, 尹衍升,等.玻璃表面纳米TiO2薄膜的制备及光催化性能研究[J].机械工程材料, 2003,27(2):34-36. [11] CAO T P,LI Y J,WANG C H,et al.Bi4Ti3O12 nanosheets/TiO2 submicron fibers heterostructures:in situ fabrication and ligh visible light photocatalytic activity[J].J Mater Chem,2011,21(19):6922-6927. [12] 杨现锋,李勇,赵巍,等.烧结温度对片状Bi4Ti3O12晶体光催化性能的影响[J].材料热处理学报,2014,35(1):6-10. [13] ZHAO W,JIA Z,LEI E,et al.Photocatalytic degradation efficacy of Bi4Ti3O12 micro-scale platelets over methylene blue under visible light[J].J Phys Chem Solids,2013,74:1604-1607.
计量
- 文章访问数: 2
- HTML全文浏览量: 0
- PDF下载量: 0