ZAO粉体的制备及其在乙醇中的分散工艺研究

发布时间：2018-03-18 15:48

  本文选题：ZAO粉　切入点：共沉淀　出处：《化工新型材料》2017年04期 　论文类型：期刊论文

【摘要】：采用共沉淀法并以氨水作为沉淀剂制备ZAO粉体,研究了pH值、煅烧温度对ZAO粉体形貌、尺寸和晶体结构的影响,并研究了粉体在无水乙醇中的分散工艺。借助差热-热重分析、X射线衍射、透射电子显微镜和紫外可见分光光度计对所制ZAO粉体进行表征。结果表明:ZAO前驱体的平均粒径随着滴定终点pH值的增大而减小,pH值小于8时,形貌不规则,pH值为9和10时,呈球形状,ZAO粉体的晶粒尺寸随着pH值增加先增大后减小,Al元素的掺杂使得ZnO的晶胞收缩;采用该法制备的ZAO前驱体中的阴离子难以洗净,煅烧温度在800℃以上时杂质才分解完全,ZAO粉体的晶粒尺寸随着煅烧温度的增加而增加;ZAO粉体在无水乙醇中最佳的分散工艺为添加ZAO粉体质量分数8%(质量分数)的六偏磷酸钠超声50min。
[Abstract]:ZAO powders were prepared by coprecipitation method with ammonia as precipitant. The effects of pH value and calcination temperature on the morphology, size and crystal structure of ZAO powders were studied. The dispersion process of the powder in anhydrous ethanol was studied. The X-ray diffraction of the powder was analyzed by differential thermogravimetric analysis (DTA). The ZAO powders were characterized by transmission electron microscope (TEM) and UV-Vis spectrophotometer. The results show that the average particle size of the precursor decreases with the increase of the pH value of the titration end point, and the pH value is less than 8:00, and the morphology of the precursor is irregular at 9 and 10:00. With the increase of pH value, the crystal size of ZAO powder increases firstly and then decreases the doping of Al element, which results in the shrinkage of ZnO cell, and the anions in the precursor of ZAO prepared by this method are difficult to be washed out. When the calcination temperature is above 800 鈩，

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