Manganese oxides are common environmental metal oxide minerals. They play significant roles in natural and engineered environments by controlling the fate and transport of a range of trace metals and organic and inorganic contaminants. The reactivity of Mn oxide minerals is highly influenced by their structure, which can be affected by cation adsorption and/or structural incorporation. Previous studies have mainly focused on the uptake of single metal species by Mn oxides, but very few studies have examined the uptake of multiple metal species by Mn oxides and the subsequent influence on the mineral structure. This study compared the adsorption of single versus multiple metal cations by a representative Mn oxide birnessite. Nine samples with varied concentrations of metal cations were prepared for each single metal and two multi-metal solutions. Inductively coupled plasma- mass spectrometry (ICP-MS) analysis was conducted to measure the adsorption of metal cations by birnessite, and the sorption isotherms were compared. X-ray diffraction (XRD) results showed that the reacted Mn oxides had less layer stacking and smaller layer size, suggesting the modification of metal adsorption on the structure of birnessite and likely subsequent reactivity.

Adsorption of multiple metal cations by Mn oxides

2019 Spring National Meeting

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