Abstract
Hexagonal mesoporous MgO nanosheets with a side length of 250nm and specific surface area of 181.692m2/g were fabricated by a three-step process. Firstly, MgO powders were obtained by sintered Mg5(OH)2(CO3)4⋅4H2O, which was synthesized by a wet precipitation process using ammonium hydrogen carbonate as precipitants. Secondly, the above-MgO were distilled 2h in a three-necked bottle with condenser device. Lastly, we annealed the distilled-MgO at 500–800°C to form mesoporous MgO nanosheets. We found the pore size distribution and the thicknesses of nanosheets were determined by the distillation process in step 2 and annealed temperature in step 3. By optimizing the experimental parameters, the mesoporous dis-MgO annealed at 600°C displayed uniform hexagonal structure with the largest pore volume (0.875cm3/g) and highest BET surface area (181.692m2/g), as well as the maximum adsorption capability of 1684.25mg/g for Ni(II).
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