| Citation: | LI Gang，WANG Cong，XIE Kefeng，et al. Transformation of Cr(Ⅲ) in different redox environments[J]. Bulletin of Geological Science and Technology，2025，44（2）：1-13 doi: 10.19509/j.cnki.dzkq.tb20240407
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It is still unclear about the effects of redox fluctuations by Fe(Ⅱ)-containing clay minerals on the adsorption-desorption and valence transformation of Cr(Ⅲ).
In this work, Cr(Ⅲ) adsorption experiments were carried out by preparing montmorillonite in three different conditions (oxidized, reduced, and reduced-reoxidized) to determine the adsorption value, Fe(Ⅱ)/total Fe ratio, hydroxyl radical concentration, as well as valence changes. The montmorillonite solid materials before and after adsorption were characterized via X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared (FTIR).
The results revealed that the adsorption rate of Cr(Ⅲ) by oxidized and reduced montmorillonite increased with elevated pH, and that reduced montmorillonite had the highest adsorption rate due to its highest Fe content, with no valence change occurring in these two states. The adsorption rate of reduced-reoxidized montmorillonite was the lowest, which was due to the rapid activation of oxygen by Fe(Ⅱ), producing hydroxyl radicals. Cr(Ⅲ) was rapidly oxidized to Cr(Ⅵ), and the lower the pH, the higher the oxidation rate. Cr(Ⅵ) was reduced back to Cr(Ⅲ) by the reducing substance Fe(Ⅱ) after 8 hours. The high correlation between the consumption rate of Fe(Ⅱ) and the generation rate of hydroxyl radicals was verified by changes in the Fe(Ⅱ)/total Fe ratio and hydroxyl radical concentration, which altered the redox environment.
Experiments have shown that hydroxyl radicals are generated after reduction and reoxidation, which affects the adsorption and desorption of Cr(Ⅲ), and strongly oxidizing hydroxyl radicals can oxidize Cr(Ⅲ) to toxic Cr(Ⅵ), supporting the hypothesis that chromium reverts to yellowish color after redox fluctuations in the underground environment.
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