Metal Hydroxide/Polymer Textiles for Decontamination of Toxic Organophosphates: An Extensive Study of Wettability, Catalytic Activity, and the Effects of Aggregation
Metal Hydroxide/Polymer Textiles for Decontamination of Toxic Organophosphates: An Extensive Study of Wettability, Catalytic Activity, and the Effects of Aggregation
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DOI：
10.1021/acsami.9b10440
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发表时间：
2019-08-28
影响因子：
9.5
通讯作者：
Jones, Wayne E., Jr.
中科院分区：
文献类型：
--
作者：
Dwyer, Derek B.;Liu, Jian;Jones, Wayne E., Jr.
静电纺丝纳米纤维（NF）与催化活性成分结合在化学防护服中获得了显着的兴趣。这是因为NF的期望性质与活性组分的去污能力相结合。在此，将一系列金属氢氧化物催化剂Ti（OH）（x）、Zr（OH）（4）和Ce（OH）（4）掺入三种不同的聚合物NF体系中。然后评价这些新的聚合物/金属氢氧化物复合NF对神经毒剂模拟物的催化活性。利用两种方法将金属氢氧化物掺入NF中。方法一使用直接掺入Ti（OH）（x）、Zr（OH）（4）和Ce（OH）（4）催化剂，而方法二使用经由前体分子掺入Ti（OH）（x）。通过方法一制备的复合NF由于催化剂的聚集减少而导致相对于相应的纯金属氢氧化物大大提高的反应速率，其中聚合物/Ce（OH）（4）复合NF在方法一材料中具有最快的反应速率。有趣的是，通过方法二制备的复合样品总体上产生了最快的反应速率。这是因为金属氢氧化物催化剂在整个NF中均匀分布。这种均匀分布产生了羟基修饰的NF表面，具有更多数量的暴露的催化活性位点。羟基修饰的NF表面还导致了意想不到的高度可降解的复合NF，这也被发现有助于观察到的反应速率。这些结果不仅在化学防护服上有很好的应用前景，而且在需要高渗透性膜材料的领域显示出巨大的应用潜力。这包括诸如分离器、隔膜和某些医疗应用等领域。
Electrospun nanofibers (NFs) incorporated with catalytically active components have gained significant interest in chemical protective clothing. This is because of the desirable properties of the NFs combined with decontamination capability of the active component. Here, a series of metal hydroxide catalysts Ti(OH)(x), Zr(OH)(4), and Ce(OH)(4) were incorporated into three different polymer NF systems. These new polymer/metal hydroxide composite NFs were then evaluated for their catalytic activity against a nerve agent simulant. Two methods were utilized to incorporate the metal hydroxides into the NFs. Method one used direct incorporation of Ti(OH)(x), Zr(OH)(4), and Ce(OH)(4) catalysts, whereas method two employed incorporation of Ti(OH)(x) via a precursor molecule. Composite NFs prepared via method one resulted in greatly improved reaction rates over the respective pure metal hydroxides due to reduced aggregation of catalysts, with polymer/Ce(OH)(4) composite NFs having the fastest reaction rates out of method one materials. Interestingly, composite samples prepared by method two yielded the fastest reaction rates overall. This is because of the homogeneous distribution of the metal hydroxide catalyst throughout the NF. This homogeneous distribution created a hydroxyl-decorated NF surface with a greater number of exposed active sites for catalysis. The hydroxyl-decorated NF surface also resulted in an unexpected highly wettable composite NF, which also was found to contribute to the observed reaction rates. These results are not only promising for applications in chemical protective clothing but also show great potential for application in areas which need highly wettable membrane materials. This includes areas such as separators, antifouling membranes, and certain medical applications.