pH值和无机盐添加剂对水热合成钨酸铋的影响  

Effect of pH value and inorganic salt additive on synthesis of bismuth tungstate by hydrothermal method

作　　者：丁益[1,2] 张奇才[2] 方辉[2] 方有春 

机构地区：[1]安徽建筑大学功能分子设计与界面过程重点实验室,合肥230022 [2]安徽建筑大学安徽省先进建筑材料重点实验室,合肥230601

出　　处：《功能材料》2015年第19期19080-19083,19088,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(21201004)

摘　　要：在170℃的温和水热条件下,用Na2WO4·2H2O、Bi(NO3)3·5H2O为原料,硝酸钠为添加剂辅助制备了三维(3D)花球状钨酸铋粉体。通过改变添加剂的浓度,发现硝酸钠在诱导花球状钨酸铋的生长和自组装过程中起到关键作用。在合适添加剂浓度的基础上,pH值的变化会对产物的物相和微观形貌有很大的影响。研究结果表明,当pH值≤10.8时,产物为Bi2WO6,当pH值=12.4时,产物转变为Bi3.84W0.16O6.24。当pH值=1.2,硝酸钠浓度为4 mol/L时,获得粉体的比表面积为33.427m2/g。Under a mild heat of 170 ℃,three-dimensional(3D)flower-like Bi2WO6 microspheres has been fabricated by a sodium nitrate assisted hydrothermal method using Na2WO4·2H2O and Bi(NO3)3·5H2O as precursors.It has been found that sodium nitrate played an important role in directing growth and self-assembly flower-like Bi2WO6 microspheres by changing the concentration of the additives.On the basis of appropriate of additive concentration demonstrated that the changing pH value carried a great effect on the morphology and the phase composition of Bi2WO6 microspheres.The results indicated the product had always been the Bi2WO6 when the pH value was less than 10.8.While transforming the pH=12.4,then the product was converted to Bi3.84W0.16O6.24 and the BET of the obtained powder was 33.427m2/g at pH=1.2and the 4mol/L sodium nitrate solution.

关 键 词：水热法 无机盐添加剂 钨酸铋 PH值 比表面积 

分 类 号：TB44[一般工业技术]