Abstract
Iron hydroxides have received high attention in the treatment of chromium (Cr) polluted wastewater. In this study, the obtained chemical (or biological) pincushion-schwertmannite spheres had a diameter of 2 − 5 μm (0.5–1 μm), and akaganéite rods had a length of 300–500 nm (100–150 nm) at an axial ratio of about 3. The average diameters (μm) of their agglomerated particles in solutions were 20.6–32.5 (only 0.480 for Aka-Chem). Schwertmannites and akaganéites were used to investigate Cr(VI) adsorption behaviors in aqueous solutions by batch experiments, under various reaction times, initial Cr(VI) and adsorbent levels, pH values, temperature and anions of NO3−, Cl−, CO32−, SO42−, and H2PO4−. Adsorption data well fitted to pseudo-second-order rate model (R2 = 0.999), and Langmuir (R2 = 0.954–0.988) and Freundlich (R2 = 0.984–0.996) isothermal models at pH 7.0. Maximum Cr(VI) adsorption capacities were 119/133 for Sch-Chem/Sch-Bio, and 14.6/83.6 for Aka-Chem/Aka-Bio. The H2PO4− than SO42−/CO32− had a stronger effect on Cr(VI) adsorption. Adsorbents with pHZPC of near to 4.0 still had a good Cr(VI) removal ability at pH 3.0–8.0. The possible Cr(VI) adsorption mechanisms by FTIR and XPS results for schwertmannite and akaganéite were electrostatic attractions and ion exchanges between hydroxyl (or sulfate) and chromate ions. The Cr(VI) adsorption of optimal schwertmannite and bioakaganéite was a spontaneous, endothermic and random process at the temperatures of 288–318 K. They had a good regeneration ability for Cr(VI) adsorption, and removal ratios could reach to about 80% of original values (60–70% in aqueous solution with 60 mg/L Cr(VI) and pH7.0, and 35–50% in wastewater with 120 mg/L Cr(VI) and about pH4.0), after three cycles. Herein, schwertmannite/bioakaganéite have a promising application in treatment of acidic/neutral wastewater with chromate.
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The authors disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: The authors received financial support by National Natural Science Foundations of China [41472034] and Natural Science General Fund of Jiangsu Province [BK20191444] for the research, authorship, and/or publication of this article.
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Huixin **ong: conceptualization, methodology, validation, supervision, funding acquisition, writing—review and editing. Yang Liu: investigation, visualization, formal analysis, writing—original draft. Shuyue Wang: investigation, methodology, validation. Shibei Zhu: investigation, data analysis.
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**ong, H., Liu, Y., Wang, S. et al. Schwertmannite and akaganéite for adsorption removals of Cr(VI) from aqueous solutions. Environ Sci Pollut Res 30, 62295–62311 (2023). https://doi.org/10.1007/s11356-023-26348-z
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DOI: https://doi.org/10.1007/s11356-023-26348-z