新法合成碳酸锌纳米晶及其数据挖掘

Synthesis of Zinc Carbonate Nano-crystals with a Novel Method and Data Mining

以七水硫酸锌粉末与碳酸氢铵粉末作原料,在适量的表面活性剂(聚乙二醇-400)存在下,在室温下充分混合研磨得到反应混合物,洗去其中的可溶性无机盐后烘干,所得前驱体为结晶良好的纯相碳酸锌纳米晶,从而获得了一种简易的合成纳米氧化锌前驱体的新方法.基于均匀设计、回归分析及最优计算,对纳米碳酸锌合成实验中得到的小型数据库作数据挖掘,所获取的优化工艺条件为:反应物摩尔比nNH4HCO3:nZnSO47H2O=1:1,表面活性剂用量20mL,研磨时间40min.在此条件下合成的碳酸锌粉末及其在350℃煅烧2h所得到的氧化锌粉末的一次粒子的平均粒径分别约35和20nm.

Solid state reaction occurred when ZnSO47H2O and NH4HCO3 powders were mixed and grinded at room temperature with surfactant PEG-400 added. Then, the soluble inorganic salts were removed by washing with water, and the fully crystallized and pure nanometer zinc carbonate precursor was obtained after it was dried. This was a new and simple method for synthesizing precursor of zinc oxide. Based on the uniform design, stepwise regression and optimization calculation, data mining was conducted to the small database from synthesis of nanometer zinc carbonate. The optimization parameters of the experiment were gained: 1:1 in molecular ratio of NH4HCO3 to ZnSO47H2O(based on 10 mmol of Zn), 20 mL in volume of PEG-400, and 40 min in grinding time. Under such conditions, the average diameter of particles for the zinc carbonate powder was about 35 nm. The nanometer zinc oxide was obtained when the zinc carbonate was pyrolyzed at 350℃ for 2 h, and its average diameter of particles was about 20 nm.