钒酸铋黄色颜料的制备——推荐一个无机化学教学实验

该实验以Bi(NO_3)_3和NH_4VO_3为原料,采用液相沉淀法,制备钒酸铋黄色颜料。学生通过控制反应物初始浓度、溶液pH、温度与时间等条件制备分散性良好、颗粒细小、组成均匀的钒酸铋。实验涉及溶液配制、加热搅拌、简易回流、控温、调pH、检验、抽滤、洗涤、干燥等操作。钒酸铋是一种绿色环保的黄色颜料,且具有降解污染物的光催化性能,因此,该实验不仅对于提高学生无机制备实验能力具有很好的教学效果,还在实验教学中渗透了环保理念。

Preparation of Bismuth Vanadate Yellow Pigment:an Inorganic Chemistry Experiment Recommended

The preparation of bismuth vanadate yel ow pigment by the liquid-phase precipitation method using Bi(NO3)3 and NH4VO3 as raw materials is recommended as an inorganic chemistry experiment. Students are required to obtain smal and uniform BiVO4 yel ow pigment particles with good dispersity by control ing the initial concentration of reactants, the pH of solution, the reaction temperature and duration. The experimental procedures involve solution preparation, heating, stirring, simple reflux, temperature and pH control, ion test, the suction filtration, washing and drying. Bismuth vanadate not only is a kind of green environmental protection yel ow pigment, but also has the photocatalytic performance to degrade pol utants. Therefore, the experiment not only is beneficial to the improvement of students' preparation ability in inorganic chemistry experiment, but also imparts the environmental education in the experimental teaching.