不同晶体结构钽酸钠的制备及光催化性能的研究  

Study on the preparation of different crystal structure and photocatalytic property of sodium tantalate

作　　者：孔新刚[1,2] 郭章林[1] 黄剑锋[1] 李嘉胤[1] 介燕妮[1] 孙有权 

机构地区：[1]陕西科技大学材料科学与工程学院,陕西西安710021 [2]安徽德力日用玻璃股份有限公司,安徽凤阳233121

出　　处：《陕西科技大学学报（自然科学版）》2014年第6期61-66,共6页Journal of Shaanxi University of Science & Technology

基　　金：陕西省科技厅自然科学基金项目(2013JQ6012);中国博士后科学基金项目(2013M542314);陕西科技大学博士科研启动基金项目(BJ12-22);陕西省重点科技创新团队项目(2013KCT-06)

摘　　要：以六钽酸钠(Na8Ta6O19)为原料,采用水热法实现了烧绿石型Na2Ta2O6、钙钛矿型NaTaO3以及Na2Ta2O6/NaTaO3复合光催化剂的可控合成.通过X射线衍射、场发射扫描电子显微镜、紫外-可见漫反射光谱对样品进行了表征,研究了水热反应中碱浓度、溶剂类型、pH值等对钽酸钠晶体结构和形貌的影响.光催化降解亚甲基蓝结果表明,光催化降解活性顺序为Na2Ta2O6/NaTaO3>Na2Ta2O6>NaTaO3,复合相中Na2Ta2O6和NaTaO3之间形成了异质结,能够有效的抑制光生电子空穴对的复合.Pyrochlore structure （Na2 Ta2 O6 ） ,perovskite structure （NaTaO3 ） and composite of sodium tantalate （Na2 Ta2 O6/NaTaO3 ） photocatalysts were controllably synthesized using sodium hexatantalate （Na8 Ta6 O19 ） as precursor via hydrothermal method .The physical properties of the asprepared samples were characterized by Xray diffraction（XRD） ,field emission scanning electron microscope （FESEM ） and UVvis diffuse reflectance spectra （DRS） and the effects of the alkali concentration ,solvent type and pH on the crystal structure and morphology of the sodium tantalate were discussed .The photocatalytic degradation results of methylene blue indicated that the activity was in the following order ：Na2 Ta2 O6/NaTaO3 〉 Na2 Ta2 O6 〉 NaTaO3 .The highest photocatalytic activity of Na2 Ta2 O6/NaTaO3 can be attributed to that heterojunction was formed between the Na2 Ta2 O6 and NaTaO3 particles and the heterojunction significantly prevented the recombination of the electronhole pairs .

关 键 词：钽酸钠 复合相 水热 光催化 

分 类 号：O643[理学—物理化学]