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The effects of calcium ions (Ca 2+ ) on the surface characteristics and adsorptive properties of hydrous manganese dioxide (δMnO 2 ), taking arsenic and humic acid as model pollutants, were systematically investigated. The FTIR spectra and SEM/EDX analyses indicate coordination between Ca 2+ and the surface hydroxyls (Mn–OH) of δMnO 2 , which leads to an increase of...
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