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进行了空气氧化Fe(OH)2悬浮液,络合剂(乙二胺、草酸、柠檬酸)作用下光催化氧化制备FeOOH的研究.结果表明:在室光下,一定量乙二胺、草酸、柠檬酸的加入有利于纯γ-FeOOH的生成;且随光强的增强,γ-FeOOH的晶化性降低.机理分析表明:可见光存在下,络合剂的加入,不仅使中间物绿锈GR(Ⅱ)结晶度变差,溶解加快;而且络合剂与Fe2+形成的配合物可吸收部分可见光,生成强氧化型的自由基,使反应初期Fe2+快速氧化为Fe3+,快的氧化速度利于生成低晶化度的γ-FeOOH。
The photocatalytic oxidation of FeOOH with air-oxidized Fe (OH) 2 suspension and complexing agent (ethylenediamine, oxalic acid and citric acid) was studied.The results showed that under room light, a certain amount of ethylenediamine and oxalic acid , And the addition of citric acid is conducive to the formation of pure γ-FeOOH; and with the increase of light intensity, the crystallinity of γ-FeOOH decreases.Mechanical analysis shows that: the presence of visible light, complexing agent addition, not only the intermediate green rust The crystallinity of GR (Ⅱ) is deteriorated and the dissolution is accelerated. Moreover, the complexes formed by the complexing agent and Fe2 + can absorb part of the visible light to form strongly oxidized free radicals, so that Fe2 + is rapidly oxidized to Fe3 + during the initial reaction, Low crystallinity γ-FeOOH.