硅镁胶的合成与吸附性能

Synthesis and Adsorption Behavior of Magnesium Silicate Gels

采用水热法,以Na2SiO3·9H2O和MgCl2·6H2O为原料合成一种新型硅镁胶(MgO.1.19 SiO2),并利用BET、SEM、FT-IR、XRD等物理分析方法对其焙烧前后进行了结构表征,同时研究了硅镁胶焙烧温度对碱性品绿吸附性能的影响。结果发现,700℃焙烧硅镁胶(C-Mg-Si gel-700)对碱性品绿吸附最好,吸附过程符合Langmuir等温吸附模型和伪二级动力学方程,最大平衡吸附量为598.95mg.g-1。

A novel Magnesium silicate gel（MgO·1.19SiO2） was synthesized by a mild hydrothermal route of Na2SiO3·9H2O and MgCl2·6H2O.The new material（Si-Mg gel） and its calcined product（C-Si-Mg gel） were characterized by BET,SEM,FT-IR and XRD.Effects of calcinations temperature on removal efficiency of basic brilliant green were studied.The results indicate that C-Si-Mg gel which was calcined at 700 ℃ behaved the best adsorbent performance.The equilibrium data were found to be well represented by the Langmuir isotherm equation.The best fit of the kinetic result was achieved by a pseudo second-order equation,with the maximum adsorption capacity up to 476.19mg·g-1.