摘要
用氯化铁和氢氧化钠溶液为原料制得了块状β-FeOOH气凝胶，构成气凝胶的基本粒子为长约18um、直径约5um的棒状粒子，制备过程包括聚合铁水凝胶的制备和超临界干燥两部分．初步研究了溶液羟铁摩尔比（OH-／Fe(3+)）对气凝胶密度和比表面的影响，应用BET、TEM、XRD和Mossbauer谱等手段对气凝胶样品进行了表征．结果表明，气凝胶样品是由β-FeOOH超细微粒构成的具有连续网络结构的多孔性块状固体，随着溶液的羟铁摩尔比（OH-／Fe(3+)）的增大，气凝胶的密度增大，比表面减小．
Monolithic β- FeOOH aerogels which consist of rodlike particles with lengths of about 18nm and diameters of about 5nm were prepared from aqueous ferric chloride and sodium hydroxide. Material synthesis involved preparation of iron polymer aquogel followed by supercritical drying. The effects of the molar ratio of OH- /Fe3+ on the density and the specific Surface area of the aerogel samples were studied. The aerogel samples were characterized with BET, TEM, XRD and Nossbauer techniques. The results show that the aerogel samples were coherent nanosized porous monolithic solids which consist of β-FeOOH ultrafine particles. By increasing the molar ratio of OH- / Fe3+. the final density of the aerogels increased with a concomitant decrease specific surface area.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1997年第1期48-51,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
关键词
β-FeOOH
气凝胶
制备
表征
β-FeOOH, Aerogel, Preparation, Characterization, Molar ratio of OH-/ Fe^(3+)
