改性MCM-41分子筛的合成与亚甲基蓝吸附性能

选用TEOS(正硅酸乙酯)做为硅源,CTAB(十六烷基三甲基溴化铵)做为表面活性剂,在碱性条件下水热合成MCM-41。实验采用3-氨丙基三甲基硅烷对MCM-41进行改性,成功得到氨基改性介孔材料NH2-MCM-41吸附剂,并使用X射线衍射(XRD)对其做了表征。考察了各种实验条件下,比如温度、吸附剂的量、pH、亚甲基蓝初始浓度等条件下MCM-41和NH2-MCM-41对水溶液中亚甲基蓝(MB)的吸附能力。MCM-41和氨基改性介孔材料NH2-MCM-41均为平面六方介孔结构。结果表明,温度和pH是影响MCM-41和NH2-MCM-41对亚甲基蓝吸附的最主要的因素。随着温度的升高,材料吸附能力增强,而过高或者过低的pH都会降低MCM-41和NH2-MCM-41对亚甲基蓝的吸附能力。

Ressearch on preparation of modified amino-functionalized MCM-41 molecular sieve and adsorption capability of methylene blue

MCM-41 mesoporous molecular sieves was synthesized under basic conditions by using TEOS as silicon source in the presence of CTAB as surfactant.The MCM-41 materials was further modified with 3-aminopropyl trimethylsilane and the amino modified mesoporous material NH₂-MCM-41 absorbent was obtained successfully.Then the NH₂-MCM-41 was characterized by X-ray diffraction（XRD）.The adsorption capability of MCM-41 and NH₂-MCM-41 on methylene blue（MB） in aqueous solution was investigated under various conditions,such as temperature,amount of adsorbent,pH,initial concentration of methylene blue.The structures of MCM-41 and the amino modified mesoporous material NH₂-MCM-41 were both planar hexagonal mesoporous structures.The results showed that the temperature and pH was the crucial importance in determining the adsorption capability of MCM-41 and NH₂-MCM-41.The adsorption capability of the materials will be improved as the the temperature increase.Furthermore,too much lower or higher pH would decrease the adsorption capability of the materials.