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. 2018 Jan 15;510:69-76. doi: 10.1016/j.jcis.2017.09.047. Epub 2017 Sep 14.
Mesoporous MgO nanosheets with a high adsorption rate and excellent adsorption capacity for removing Ni (II) were successfully synthesized by a hydrothermal and annealing method. The Mg(OH) was first synthesized by a hydrothermal process using magnesium powder as the starting material. MgO was then obtained by annealing the as-prepared Mg(OH) at 450°C. The advantage of the magnesium powder as the starting material is it slowly generated Mg. Thus, the low centration of Mg guaranteed a slow rate of forming Mg(OH), which benefited with a mesoporous structure. The effect of the hydrothermal time on the structure and adsorption performance was studied. The results showed that the MgO synthesized for 4h had the highest adsorption performance of 2217mg/g and the highest adsorption rate, which resulted in an efficient adsorption of 96% in 5min for Ni (II) with the concentration of 500mg/L.
介孔 MgO 纳米片具有高吸附速率和优异的吸附容量，可成功地通过水热和退火法合成以去除 Ni（II）。首先，使用镁粉作为起始原料通过水热法合成 Mg(OH)。然后，将所制备的 Mg(OH)在 450°C 下退火得到 MgO。以镁粉作为起始原料的优点是其可以缓慢地生成 Mg。因此，低浓度的 Mg 保证了形成 Mg(OH)的缓慢速率，这有利于形成介孔结构。研究了水热时间对结构和吸附性能的影响。结果表明，水热 4 小时合成的 MgO 具有最高的吸附性能（2217mg/g）和最高的吸附速率，在浓度为 500mg/L 的 Ni（II）溶液中，在 5 分钟内实现了 96%的高效吸附。
