Feng Jing, Zou Linyi, Wang Yuting, Li Bowen, He Xiaofeng, Fan Zhuangjun, Ren Yueming, Lv Yanzhuo, Zhang Milin, Chen Dan
Key Laboratory of Superlight Materials & Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001, PR China.
Key Laboratory of Superlight Materials & Surface Technology of Ministry of Education, Harbin Engineering University, Harbin 150001, PR China.
J Colloid Interface Sci. 2015 Jan 15;438:259-267. doi: 10.1016/j.jcis.2014.10.004. Epub 2014 Oct 16.
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 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 2 h 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 (0.875 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).
通过三步法制备了边长为250 nm、比表面积为181.692 m²/g的六边形介孔MgO纳米片。首先，通过烧结Mg5(OH)2(CO3)4⋅4H2O获得MgO粉末，Mg5(OH)2(CO3)4⋅4H2O是使用碳酸氢铵作为沉淀剂通过湿沉淀法合成的。其次，将上述MgO在带有冷凝装置的三颈瓶中蒸馏2小时。最后，将蒸馏后的MgO在500-800°C下退火以形成介孔MgO纳米片。我们发现孔径分布和纳米片的厚度由步骤2中的蒸馏过程和步骤3中的退火温度决定。通过优化实验参数，在600°C退火的介孔二价MgO呈现出均匀的六边形结构，具有最大的孔体积（0.875 cm³/g）和最高的BET表面积（181.692 m²/g），以及对Ni(II)的最大吸附能力1684.25 mg/g。
