Ultralight MgO and Its Efficient Adsorption to Pb2+ and Mn2+ (E-pub Ahead of Print)
Pei Xie ,
Jun Li .
In this work, the precipitation combined with vacuum drying and supercritical CO2 drying was applied to preparation of Mg(OH)2 which was thermally decomposed to MgO. Results showed that the constant dropping rate of Mg(NO3)2 solution into NaOH aqueous solution under 90 oC with a relatively high pH of 10.1 led to the MgO powder with high specific surface area and large pore volume with both vacuum drying and supercritical drying.
Among the produced MgO, the pore volume1.45 cm3/g from the vacuum drying was is the highest, and the bulk density 0.0247 g/ml from the supercritical drying is the lowest in the reported literature. Particularly, the MgO produced from the supercritical drying showed high adsorption of Pb2+ (as high as 3635 mg/g at pH=6 and 25oC) and Mn2+ (as high as 861 mg/g at pH=6 and 25oC). The adsorption isotherms and adsorption kinetics of Pb2+ and Mn2+ adsorption on the MgO were discussed.
Keywords: Magnesium oxide, supercrital drying, lead, manganese, adsorption
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