电化学溶解镁阳极制备纳米MgO粉体

PREPARATION OF THE NANO-SIZED MgO POWDER BY DISSOLUTION OF Mg ANODE

该文以"牺牲"阳极溶解法在0.04mol／L(Bu4N)Br的乙醇和乙酰丙酮混合溶液中,电流强度控制在0.2A,电解镁片6h,制得纳米氧化物粉体MgO的前驱体Mg(OEt)2-x(acac)xo控制pH=8.0左右,将含有前驱体的电解液直接水解。水解产物经洗涤、干燥后于500℃煅烧2h,制得纳米MgOg粉体。采用红外(IR)、差热-热重分析(TG-DTA)、X-射线衍射(XRD)、电子透射技术(TEM)等手段对前驱体和纳米MgO进行了表征。结果表明:制备得到的纳米粉体呈单分散结构,平均粒径在12nm左右。用此种方法比较容易制得所需产物,是一种合成纳米氧化物的很有前途的方法。

In this paper,the magnesium was electrolyzed at the current of 0.2A for 6h in ethanol and acetyl-acetone solution of 0.04mol/L(Bu4)NBr,and then the precursor Mg(OEt)2-x(acac)x of MgO was obtained by anodic dissolution.The xerogel of MgO was prepared by a direct sol-gel process of the electrolyte solution under pH=8.0.IR.spectrum,TG-DTA,XRD,and TEM were used to investigate the structure of the precursor and nano-sized MgO.The results show that nano-sized MgO with a narrow size distribution of around 12nm can be obtained at a low temperature of 500℃.This process may be recomeded as a promising method to synthesize the other nano-powder.