摘要
在乙醇溶剂中制备纳米Ag2O时,发现有纳米Ag2O和纳米Ag 2种产物,进而通过XRD对其反应机理进行了研究。实验结果和理论分析表明,溶剂对制备纳米氧化银有很大影响,在乙醇溶剂中不能制备出纯的纳米氧化银;其反应机理为该反应首先是银离子与氢氧根离子反应生成氧化银沉淀,氧化银在碱性条件下将溶剂乙醇氧化为乙醛,而自身被还原为单质银;生成的乙醛又将银离子和氧化银还原为单质银,从而导致产物既有纳米氧化银又有纳米银;其中碱性介质是氧化银将乙醇氧化为乙醛的催化剂。
Two kinds of products, nano-Ag2O and nano-Ag were found in preparing nano-Ag20 by ethanol solvent;and then the mechanism of this reaction was investigated by XRD. The experimental results and theoretical analysis showed that the solvent has a great influence on the preparation of nano-silver oxide, and pure nano-Ag2O can not be obtained in ethanol solvent. And that this reaction mechanism is that first, silver ion reacts with hydroxyl ion and the precipitation of silver oxide is produced;under alkaline condition, ethanol solvent is oxidated to acetaldehyde by the silver oxide, and itself is reduced to silver; the silver ions and silver oxide are reduced to silver by acetaldehyde, resulting in two products：nano-silver oxide and nano-silver;in the reaction,the alkaline medium is the catalyst for oxidating ethanol to acetaldehyde by silver oxide.
出处
《应用化工》
CAS
CSCD
2012年第8期1321-1322,1326,共3页
Applied Chemical Industry
基金
国家自然科学基金(20773092)
山西省研究生优秀创新项目资助(20103038)
关键词
乙醇
纳米氧化银
反应机理
ethanol
nano-silver oxide
reaction mechanism
