不同表面活性剂对合成介孔氧化镁晶体性质的影响

采用液相法,以Mg(NO3)2·6H2O为镁源,NH3·H2O为沉淀剂,研究了不同表面活性剂对介孔MgO晶体性质的影响.采用XRD、FT-IR、SEM、BET和CO2-TPD等手段对介孔MgO晶相组成、骨架结构、微观形貌、孔结构及表面化学性质进行了分析表征.研究结果表明,不同表面活性剂对介孔MgO晶体物化性质影响较大.以非离子型PEG-2000为表面活性剂制得产品表面碱强度和碱总量均大于以阴离子型SDS、阳离子型CTAB制得的产品.以非离子型PEG-2000为表面活性剂制备得到的介孔MgO同时具有弱碱、中强碱特征,碱总量为0.192 mmol·g-1,比表面积、孔容和平均孔径分别为145.42 m2·g-1、0.67 cm3·g-1和18.56 nm.

Effect of Various Surfactants on the Crystal Properties of Mesoporous MgO Crystal

Effect of various surfactants on the crystalline properties of mesoporous MgO was investigated via liquid phase method with Mg(NO3)2·6H2O as Magnesium source and NH3·H2O as preapitant.crystalline phase, skeletal structure, morphology, pore structure and surface alkalinity of these obtained products were characterized by XRD, FT-IR, SEM, BET and CO2-TPD techniques.The results indicate that various surfactants pose significant impact on the physicochemical properties of mesoporous MgO.The base strength and content of the synthesized products from nonionic PEG-2000 are higher than those samples obtained by using anionic SDS and cationic CTAB as the surfactant.The products obtained from nonionic PEG-2000 possessed distinct properties with weak base and medium base, total base amount of 0.192 mmol·g-1, specific surface area of 145.42 m2·g-1, pore volume of 0.67 cm3·g-1 and average pore diameter of 18.56 nm.