Abstract
The artificial β-FeOOH rusts were synthesized by oxidation of FeCl 2 solutions and hydrolysis of FeCl 3 solutions. Various Na salts such as sulfate, biphosphate, nitrate, and silicate were added to the starting solutions at different anion/Fe molar ratios of 0–0.05. The XRD patterns of the products showed only the diffraction peaks of β-FeOOH. The crystallinity of the products was noticeably reduced by adding SO 4 2 - and HPO 4 2 - but slightly influenced by adding NO 3 - . The addition of SiO 3 2 - markedly crystallized the products by the hydrolysis of FeCl 3. The N 2 adsorption revealed that the products with SO 4 2 - were porous particles assembled by β-FeOOH subcrystals. SO 4 2 - and HPO 4 2 - strongly coordinating to Fe(III) markedly lowered the crystallinity of the products and remained in the formed particles.
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