Effect of thermal and mechano-chemical activation on the photocatalytic efficiency of ZnO for drugs degradation
Effect of thermal and mechano-chemical activation on the photocatalytic efficiency of ZnO for drugs degradation
复制标题
热和机械化学活化对 ZnO 药物降解光催化效率的影响
DOI：
10.1007/s12272-016-0789-6
复制
发表时间：
2016
影响因子：
6.7
通讯作者：
A. Eliyas
中科院分区：
文献类型：
--
作者：
N. Kaneva;A. Bojinova;K. Papazova;D. Dimitrov;K. Zaharieva;Z. Cherkezova;A. Eliyas
在过去的几年中，由于药物即使在低浓度下也能持续输入并持续存在于水生生态系统中，因此被认为是新兴污染物。它们已在世界各地的环境基质中检测到，表明使用传统方法无法有效地从水和废水中去除它们。在这项研究中，我们提出了在紫外光照射下通过 ZnO 光催化净化水中的对乙酰氨基酚和氯霉素。商用 ZnO 粉末经过热活化（在不同温度 - 100、200、300、400 和 500 °C 下退火 1 小时）和机械活化（处理 5、15、20、30、40 和 60 分钟）。机械激活是通过改变空气中或乙醇和甲醇悬浮液中的气氛来进行的。通过 X 射线衍射和扫描电子显微镜研究了所研究材料（样品的相组成、结构和粒径）和形态的变化。在 100 °C 退火的 ZnO 粉末表现出最高的光催化效率和染料降解速率常数，这是由于纳米晶尺寸较小且表面发达。对乙酰氨基酚和氯霉素的降解率随着机械活化时间的延长而增加，最多 30 分钟，然后降低。通过实验确定机械激活的最佳温度和时间。
Over the past few years, pharmaceutical drugs have been considered as emerging pollutants due to their continuous input and persistence in the aquatic ecosystem even at low concentrations. They have been detected worldwide in environmental matrices, indicating their ineffective removal from water and wastewaters using conventional methods. In this study we present photocatalytic purification of water from Acetaminophen and Chloramphenicol by ZnO upon UV-light illumination. Commercial ZnO powders are activated thermally (annealed at different temperatures—100, 200, 300, 400 and 500 °C for 1 h) and mechanically (treated for 5, 15, 20, 30, 40 and 60 min). The mechonoactivation is performed varying the atmosphere in air, or in suspension of ethanol and methanol. The changes in the studied material (phase composition, structure and particle size of the samples) and morphology have been investigated by means of X-ray diffraction and Scanning electron microscopy. The ZnO powders annealed at 100 °C show highest photocatalytic efficiency and rate constant of dye degradation, which is due to the smaller size of nanocrystallites and their better developed surface. The degradation rate of Acetaminophen and Chloramphenicol increases with time of mechanical activation up to 30 min and then decreases. The optimal temperature and time of mechanoactivation are experimentally established.
影响因子：
3.7
作者：
Kaftelen, Hulya;Ocakoglu, Kasim;Erdem, Emre
通讯作者：
Erdem, Emre