摘要
针对传统的超细氧化锌粉体制备过程存在设备要求严格、操作条件复杂和需外加分散剂等问题,采用以阳离子交换膜为隔膜的两室电化学沉淀法,控制阴极电流密度在50～150 A/m2,阴极产生的OH-与通过阳离子交换膜迁移进入阴极室的Zn2+相结合得到氢氧化锌沉淀。该沉淀物经过350℃焙烧2 h后得到氧化锌粉体。由TEM和XRD分析可知:氧化锌粉体颗粒随着阴极电流密度增加而逐渐降低,当阴极电流密度达到150 A/m2时,获得的氧化锌粉体粒度为50～80 nm,为六方晶系结构。实验研究表明:该两室电化学沉淀法具有操作条件简单、设备要求不高、不需外加化学分散剂等优点,是制备超细氧化锌粉体的有效方法。
Aimed at addressing the disadvantages occurring in the conventional preparation of ultrafine zinc oxide powder,such as sophisticated equipment,complex operating conditions and additional dispersing agents,this paper introduces how to obtain zinc hydroxide precipitation in cathode chamber of two-chamber electrobath divided by cation-exchange membrane,by controlling the current densities at 50~150 A/m2 on cathode,and combining hydroxyl ion generated by electrolyzing sodium chloride solution in cathode chamber with zinc ion migrating into anode chamber.Ultra-fine particles of zinc oxide are prepared by calcining precipitate for two hours at the temperature of 350 ℃.The TEM and XRD analysis shows that the zinc oxide powder exhibits a gradually reducing size due to an increasing electrolyzing density on cathode.Zinc oxide nanoparticles obtained with electrolyzing density of 150 A/m2 have the diameter of 50~80 nm and zinc oxide shows a hexagonal crystal system.The experiment results show that the two-chamber electrochemical precipitation,boasting advantages,such as an easier operating condition,less sophisticated equipment,and freedom from chemical dispersants,works as a more effective method designed for preparing ultrafine zinc oxide powder.
出处
《黑龙江科技学院学报》
CAS
2012年第6期567-570,584,共5页
Journal of Heilongjiang Institute of Science and Technology
关键词
电化学方法
氧化锌
纳米粉体
electrochemical method
zinc oxide
ultra-fine powder
