反应温度对水热法制备的NaTaO_3粉体结构及光催化性能的影响  

Effects of Reaction Temperature on Structure and Photocatalytic Properties of NaTaO_3 Powders Prepared by Hydrothermal Method

作　　者：章薇[1] 谈国强[1] 夏傲[1] 任慧君[1] 

机构地区：[1]陕西科技大学材料科学与工程学院,西安710021

出　　处：《硅酸盐学报》2011年第11期1724-1728,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50872077);国家自然科学青年基金(51002-092);陕西省自然科学基金(2010JM6013);陕西科技大学研究生创新基金(SUST-A04)资助项目

摘　　要：以Ta2O5和NaOH为原料,采用水热法在120～180℃保温12 h合成NaTaO3粉体。利用X射线衍射、场发射扫描电子显微镜及透射电子显微镜表征NaTaO3的物相、形貌以及结构。研究了不同反应温度对粉体物相结构及光催化性能的影响。结果表明,在120～180℃保温均能合成出纯斜方相NaTaO3粉体,晶粒尺寸在200～720 nm,平均禁带宽度为3.9 eV,比表面积为2.0 m2/g左右;140℃时制备的NaTaO3粉体的光催化效果最好,紫外光照射210 min后罗丹明B的降解率达到92%以上。The NaTaO3 powders were prepared using Ta2O5 and NaOH as raw materials at 120–180 ℃ for 12 h by a hydrothermal method.The phase composition and morphology of the NaTaO3 powders were characterized by X-ray diffractometer,field emission scanning electron microscope and transmission electron microscope.The effect of reaction temperature on phase composition and photocatalytic properties of the NaTaO3 powders were investigated.The results show that the NaTaO3 powders with the pure ortho-rhombic phase in the grain size range from 200 to 720 nm can be synthesized at 120–180 ℃,and the average band gap and the spe-cific surface area were 3.9 eV and 2.0 m2/g,respectively.NaTaO3 powder prepared at 140 ℃ had an optimal photocatalytic effect.The degradation rate of rhodamine B could be 〉92% after 210 min under the ultraviolet light irradiation.

关 键 词：钽酸钠 水热法 反应温度 光催化 

分 类 号：TB44[一般工业技术] TQ135.13[化学工程—无机化工]