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• W4313442973 endingPage "109170" @default.
• W4313442973 startingPage "109170" @default.
• W4313442973 abstract "The adsorption behavior of As(III) and As(V) on natural schwertmannite (NSCH) was investigated using batch experiments and spectroscopic observations. NSCH showed comparable As adsorption capacities to synthetic schwertmannite (SSCH); particularly, a much higher affinity toward As(III) than toward As(V) was observed at pH 7, suggesting that NSCH is a promising As(III) adsorbent. As(III) adsorption increased with increasing pH and decreasing ionic strength (IS); effects of pH and IS on As(V) adsorption were opposite and negligible, respectively. These results indicated that the adsorption behaviors of As(III) and As(V) are significantly affected by the solution pH, IS, and As species. Speciation modeling and X-ray spectroscopic analyses revealed limited adsorption of As(V) on NSCH through the formation of only the bidentate binuclear corner-sharing inner-sphere complex, which was suppressed at a pH above the pHPZC because of the electrostatic repulsion between the anionic As(V) and the negatively charged NSCH surface. Compared to As(V), a greater amount of As(III) was adsorbed on NSCH, forming both bidentate mononuclear edge-sharing and bidentate binuclear corner-sharing inner-sphere complexes, including minor outer-sphere complexes. Some of the adsorbed As(III) was oxidized to As(V) during adsorption. Owing to the strong surface complexation, less than 4% of As(III) and As(V) were desorbed, indicating that stable As fixation is possible. These findings provided valuable information for the recycling of acid mine drainage sludge and its use in eco-friendly and cost-effective As attenuation." @default.
• W4313442973 created "2023-01-06" @default.
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• W4313442973 date "2023-02-01" @default.
• W4313442973 modified "2023-10-10" @default.
• W4313442973 title "Characterization of arsenic (III and V) adsorption on natural schwertmannite formed in acid coal mine drainage: Batch studies and spectroscopic observations" @default.
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• W4313442973 doi "https://doi.org/10.1016/j.jece.2022.109170" @default.
• W4313442973 hasPublicationYear "2023" @default.
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