Synthesis of high surface area, mesoporous MgO nanosheets with excellent adsorption capability for Ni(II) via a distillation treating

Hexagonal mesoporous MgO nanosheets with a side length of 250 nm and specific surface area of 181.692 m(2)/g were fabricated by a three-step process. Firstly, MgO powders were obtained by sintered Mg-5(OH)(2)(CO3)(4).4H(2)O, which was synthesized by a wet precipitation process using ammonium hydrogen carbonate as precipitants. Secondly, the above-MgO were distilled 2 h in a three-necked bottle with condenser device. Lastly, we annealed the distilled-MgO at 500-800 degrees 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 degrees C displayed uniform hexagonal structure with the largest pore volume (0.875 cm(3)/g) and highest BET surface area (181.692 m(2)/g), as well as the maximum adsorption capability of 1684.25 mg/g for Ni(II). (C) 2014 Elsevier Inc. All rights reserved.

通过三步法制备了边长为250 nm、比表面积为181.692 m²/g的六方介孔氧化镁纳米片。首先，以碳酸氢铵为沉淀剂，通过湿沉淀法合成Mg - 5(OH)₂(CO₃)₄·4H₂O，然后烧结得到氧化镁粉末。其次，将上述氧化镁在带有冷凝装置的三口瓶中蒸馏2小时。最后，将蒸馏后的氧化镁在500 - 800℃下退火以形成介孔氧化镁纳米片。我们发现纳米片的孔径分布和厚度由第二步的蒸馏过程和第三步的退火温度决定。通过优化实验参数，在600℃下退火的介孔蒸馏氧化镁呈现出均匀的六方结构，具有最大的孔体积（0.875 cm³/g）和最高的BET比表面积（181.692 m²/g），对Ni(II)的最大吸附量为1684.25 mg/g。（C）2014爱思唯尔公司。保留所有权利。