不同形貌氧化锌的微波水热法制备及其光催化性能

采用微波水热法在乙二醇的辅助下,制备出一系列不同形貌的氧化锌(Zn O)纳米/微米颗粒。扫描电子显微镜测试结果表明,乙二醇的加入量对样品的形貌有着非常显著的影响,通过控制乙二醇的加入量,可以得到不规则片状、六方棱柱孪晶、梭子形和球形等形貌的Zn O纳米/微米颗粒。从微波反应器检测压力结果可以看出,乙二醇的加入量对反应体系的压力影响非常显著,这起到了调控纳米晶生长速度的效果进而得到不同形貌的样品。在此基础上,系统测试了样品在氙灯照射下光催化降解罗丹明B的能力,结果表明,乙二醇加入量大于12 m L时的球状样品光催化效率要远高于其他样品,在50 min内能完成对罗丹明B的降解。

Microwave Hydrothermal Synthesis and Photocatalytic Properties of ZnO Nano-/Microparticles

ZnO with various morphologies has been obtained by microwave hydrothermal method with the assistance of ethylene glycol(EG). By adjusting the concentration of EG in the system, the morphology of sample can be tuned from irregular disks to twin crystal rods, to shuttle shape, and finally to sphere shape. It is founded that the concentration of EG plays an important role in adjusting system pressure, which significantly influence the reaction speed and final shape of products. The photocatalytic activity of as-prepared ZnO with different morphologies in aqueous solution was investigated by bleaching dye rhodamine B under Xe lamp. The sphere shape sample possesses the most efficient photocatalytic properties, which can completely photodegradate rhodamine B in 50 min.