Synthesis of zeolite membranes on calcium silicate support and their bioactive response.
Synthesis of zeolite membranes on calcium silicate support and their bioactive response.
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DOI：
10.1007/s40204-018-0085-2
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发表时间：
2018-03
影响因子：
4.9
通讯作者：
García-Ruiz G
中科院分区：
文献类型：
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作者：
Medina-Ramírez A;Flores-Díaz AA;Ruiz Camacho B;García-Ruiz G
采用二次生长法制备了硅酸钙负载沸石膜。评价了功能化剂对均相沸石膜形成的化学性质。使用一种单体和两种阳离子聚合物：3-氨丙基三乙氧基硅烷（APS）、聚乙烯亚胺（PEI）和聚二烯丙基二甲基氯化铵（PDDA）。对载体进行化学官能化，然后用沸石晶体摩擦。W沸石以两种不同的Si/Al比用作沸石晶种。将官能化和摩擦的载体在150 °C下进行水热处理48小时。采用仿生方法，将均质沸石膜在37 °C的模拟体液（SBF）中浸泡21天，评价其生物活性。两种浸泡方法进行了评价。采用XRD和SEM技术对产物进行了表征。结果表明，PDDA的负载功能化和沸石的Si/Al比（大于1.8）增强了载体与沸石前驱体之间的相互作用，促进了沸石膜的形成。通过FTIR检测膜上PDDA官能团的存在。在模拟体液中浸泡后，沸石膜稳定，并在其表面形成Ca-P层。再浸渍法导致形成更富的Ca/P层（1.36）。这些发现允许产生具有硅酸钙和沸石材料的可控孔隙率的组合性质的沸石膜，使其潜在地可用于骨再生和药物释放。
The synthesis of calcium silicate supported zeolite membrane was carried out by second growth method. The chemical nature of the functionalizing agent on the formation of homogenous zeolite membrane was evaluated. One monomer and two cationic polymers were used: 3-aminopropyltriethoxysilane (APS), polyethylenimine (PEI) and polydiallyldimethylammonium chloride (PDDA). The support was subjected to chemical functionalization and then it was rubbed with zeolite crystals. The W zeolite was used as zeolite seed in two different Si/Al ratios. The functionalized and rubbed supports were submitted to hydrothermal treatment at 150 °C for 48 h. The bioactivity of the homogeneous zeolite membranes was evaluated by the biomimetic method through the membranes soaking in a simulated body fluid (SBF) at 37 °C for 21 days. Two immersion methods were evaluated. The products were characterized by XRD and SEM techniques. The results indicated that the supported functionalization with PDDA and the Si/Al ratio (higher than 1.8) of zeolite enhanced the interaction between the support and the zeolite precursor enhancing the formation of homogeneous zeolite membrane on the surface. The presence of the functional groups of PDDA on the membrane was detected by FTIR. After immersion in SBF, the zeolite membrane was stable and led to the formation of Ca–P layer on its surface. The re-immersion method led to the formation of richer Ca/P layer (1.36). These findings allowed generating a zeolite membrane with combined properties of calcium silicate and the controllable porosity of zeolitic material making it potentially useful for bone regeneration and drug releasing.