膜法纯化液相沉淀法合成的纳米Fe_2O_3水合物

Purification of the nanosized ferric oxide hydrates prepared by the liquid-phase precipitation

采用超滤膜分离技术纯化由液相沉淀法合成的纳米氧化铁水合物,考察超滤膜材质及截留分子量(MWCO)、膜分离过程操作参数对透过通量大小及稳定性的影响;并研究膜污染机制及相应的清洗方案。结果表明,纯化效果好、效率高,且污染膜易于清洗,可重复使用,膜法纯化不失为一有效的纯化新途径。

In this work the ultrafiltration （UF） membrane separation technology was applied to the purification of the nanosized ferric oxide hydrates prepared by means of liquid-phase precipitation. The influence of mem- brane molecular weight cut off （MWCO） and the operational parameters on the UF membrane permeate flux and the running stability was studied. The membrane fouling and membrane cleaning were also studied. The characteristic of high flux and easy cleaning has led us to conclude that the UF separation technology is an efficient method for the purification of the nanosized ferric oxide hydrates.