不同表面活性剂对合成介孔氧化镁晶体性质的影响

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

采用液相法,以Mg(NO_3)_2·6H_2O为镁源,NH_3·H_2O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 m^2·g^(-1)、0.67 cm^3·g^(-1)和18.56 nm。

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.