The synthesis and microstructure of goethite particles precipitated in highly alkaline media
作者:Mira Ristić、Ivana Opačak、Svetozar Musić
DOI:10.1016/j.jallcom.2013.01.027
日期:2013.5
Iron choline citrate was used as the starting chemical in the synthesis of long goethite rods in highly alkaline media. Goethite particles were characterized by 57Fe Mossbauer, XRD, FT-IR, UV/Vis/NIR and FE-SEM. The phase composition and morphology of goethite particles did not change for up to 14 days of heating their suspension at 90 °C. However, upon autoclaving the suspension at 160 °C, the phase
柠檬酸胆碱铁被用作在高碱性介质中合成长针铁矿棒的起始化学品。针铁矿颗粒通过 57Fe Mossbauer、XRD、FT-IR、UV/Vis/NIR 和 FE-SEM 进行表征。针铁矿颗粒的相组成和形态在 90 °C 下加热悬浮液长达 14 天没有变化。然而,在 160 °C 下对悬浮液进行高压灭菌后,通过溶解/再结晶机制发生相变针铁矿 → 赤铁矿,如 FE-SEM 所证实。在空气中将针铁矿颗粒在 300°C 下加热 2-4 小时后,形成了具有原始针铁矿颗粒形态保留的赤铁矿。由于固态重排的共同影响,包括残留 OH 基团的损失和烧结,在 800 °C 下形成的赤铁矿颗粒显示出形态的变化。