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• W1981036317 abstract "Manganese oxide (MnOx(s)) occurs naturally in soil and has a high affinity for trace metals adsorption. In this work, we quantified the factors (pH; flow rate; use of oxidants such as bleach, H2O2, and O3; initial Mn(II) concentrations; and two types of geologic media) affecting MnOx(s) coatings onto Ottawa and aquifer sand using batch and column experiments. The batch experiments consisted of manual and automated titration, and the column experiments mimicked natural MnOx(s) adsorption and oxidation cycles as a strategy for in situ adsorption. A Pb solution of 50 mg L−1 was passed through MnOx(s)–coated sand at a flow rate of 4 mL min−1 to determine its adsorption capacity. Batch experimental results showed that MnOx(s) coatings increased from pH 6 to 8, with maximum MnOx(s) coating occurring at pH 8. Regarding MnOx(s) coatings, bleach and O3 were highly effective compared with H2O2. The Ottawa sand had approximately twice the MnOx(s) coating of aquifer sand. The sequential increase in initial Mn(II) concentrations on both sands resulted in incremental buildup of MnOx(s). The automated procedure enhanced MnOx(s) coatings by 3.5 times compared with manual batch experiments. Column results showed that MnOx(s) coatings were highly dependent on initial Mn(II) and oxidant concentrations, pH, flow rate, number of cycles (h), and the type of geologic media used. Manganese oxide coating exceeded 1700 mg kg−1 for Ottawa sand and 130 mg kg−1 for aquifer sand. The Pb adsorption exceeded 2200 mg kg−1 for the Ottawa sand and 300 mg kg−1 for the aquifer sand." @default.
• W1981036317 created "2016-06-24" @default.
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• W1981036317 date "2013-11-01" @default.
• W1981036317 modified "2023-09-27" @default.
• W1981036317 title "Formation of Manganese Oxide Coatings onto Sand for Adsorption of Trace Metals from Groundwater" @default.
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• W1981036317 doi "https://doi.org/10.2134/jeq2013.04.0142" @default.
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