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FSM- 16,MCM- 4 1和 SBA- 15等具有高规则性的二维六角晶格结构的多孔硅可由不同的硅酸盐或有机硅氧化物结合表面活性剂制备而成 ,孔径的大小可根据表面活性剂的不同烷基链长和有机膨胀剂的添加量加以控制 ,最大可分别达到 10 0 ,10 0和 150 ,但其晶格的规则性则随孔径的增大而降低。我们发现了用层状硅酸盐Kanemite制备的 FSM- 16和来自硅酸钠的 MCM- 4 1,其表面阴离子度比用四甲氧基硅烷 ( TMOS)制备的 SBA- 15高得多。如将在等电点以下呈阳离子性的生物酶插入多孔硅中 ,则由于形成的离子间相互作用和氢键结合力 ,可得到结合得十分稳定的生物 /无机陶瓷结合体。特别是孔径比生物酶的尺寸 ( 4 6 )稍大的情况下结合最稳定 ,其结合量可达 2 0 % ,以此结合体作为有机酸化反应的催化剂 ,呈现了很高的反应活性。此方法在环境工程上将有十分广阔的应用前景。
Porous silicon with high regularity such as FSM-16, MCM-4 1 and SBA-15 having a two-dimensional hexagonal lattice structure can be prepared from different silicate or organosilicon oxide-binding surfactants, and the pore size can be Depending on the alkyl chain length of the surfactant and the amount of organic expansion agent added, the maximum can reach 10 0, 10 0 and 150, respectively. However, the regularity of the lattice decreases with the increase of the pore diameter. We have discovered that FSM-16, made with the layered silicate Kanemite and MCM-4 1 from sodium silicate, has a much higher surface anionicity than SBA-15 made with tetramethoxysilane (TMOS). If an enzyme that is cationic below the isoelectric point is inserted into the porous silicon, bio-inorganic ceramic conjugates that are well-bound can be obtained due to the formation of ionic interactions and hydrogen bonding forces. In particular, when the pore size is slightly larger than the size of the enzyme (46), the binding is most stable and the amount of binding is up to 20%. Thus, the conjugate exhibits high reactivity as a catalyst for the organic acidification reaction. This method will have a very broad application prospect in environmental engineering.