【摘要】 采用溶胶-凝胶法并用两种不同的工艺制备γ-氧化铝改性膜:其一为通过掺杂硼来制改性膜;其二为通过溶液浸渍钾盐溶液制得改性膜。考察了两种改性工艺对膜的微观结构、晶相组成和孔结构的影响。结果表明:采用溶胶内掺杂硼的改性工艺制得的膜,表面平整;由溶液浸渍工艺改性制得的膜微观表面凹凸不平,孔易被沉积成分所堵塞,但可使改性成分有效地富集于孔内部,并且两种工艺制得膜的晶相均为γ-氧化铝相与复合相,表明第二组分已被成功地引入到γ-氧化铝膜组分中。采用溶胶-凝胶法制备γ-Al2O3改性膜的孔结构明显优于由溶液浸渍工艺制得的改性膜的孔结构。更多还原

【Abstract】 The membranes were modified by two techniques:one （I） was that the boron dopedγ-Al₂O₃membranes were synthesized by doping H₃BO₃into Al（OH）₃sol, the other （II） was thatγ-Al₂O₃porous membranes were soaked in K₂CO₃solution to obtain the modified membranes. Then the effects of the modification techniques on the pore structure and the crystal phase were investigated. The results show that γ-Al₂O₃modification membranes are prepared by sol-gel. And the even and net structures have been obtained by technique. However, the membranes surfaces by technique are concave-convex, the pores are filled with modification composition. At the same time,γ-Al₂O₃phase and the composite phase existed in the γ-Al₂O₃modification membranes by the two techniques. Namely, the composite composition have been brought in the composition of γ-Al₂O₃membranes. The pore structures of Al-B membranes was superior to that of Al-K membranes.更多还原