Department of Nanobiotechnology, Biology Centre, ISB, CAS, Na Sadkach 7, 370 05 Ceske Budejovice, Czech Republic.
Regional Centre of Advanced Technologies and Materials, Czech Advanced Technology and Research Institute, Palacky University, Slechtitelu 27, 783 71 Olomouc, Czech Republic.
ACS Appl Mater Interfaces. 2021 May 26;13(20):23627-23637. doi: 10.1021/acsami.1c02154. Epub 2021 May 14.
At present, both native and immobilized nanoparticles are of great importance in many areas of science and technology. In this paper, we have studied magnetic iron oxide nanoparticles and their aggregates bound on woven cotton textiles employing two simple modification procedures. One modification was based on the treatment of textiles with perchloric-acid-stabilized magnetic fluid diluted with methanol followed by drying. The second procedure was based on the microwave-assisted conversion of ferrous sulfate at high pH followed by drying. The structure and functional properties of these modified textiles were analyzed in detail. Scanning electron microscopy of native and modified textiles clearly showed the presence of iron oxide nanoparticles on the surface of the modified cotton fibers. All of the modified textile materials exhibited light to dark brown color depending on the amount of the bound iron oxide particles. Magnetic measurements showed that the saturation magnetization values reflect the amount of magnetic nanoparticles present in the modified textiles. Small-angle X-ray and neutron scattering measurements were conducted for the detailed structural characterization at the nanoscale of both the native and magnetically modified textiles, and different structural organization of nanoparticles in the two kinds of textile samples were concluded. The textile-bound iron oxide particles exhibited peroxidase-like activity when the ,-diethyl--phenylenediamine sulfate salt was used as a substrate; this nanozyme activity enabled rapid decolorization of crystal violet in the presence of hydrogen peroxide. The deposition of a sufficient amount of iron oxide particles on textiles enabled their simple magnetic separation from large volumes of solutions; if necessary, the magnetic response of the modified textiles can be simply increased by incorporation of a piece of magnetic iron wire. The simplicity of the immobilized nanozyme preparation and the low cost of all the precursors enable its widespread application, such as decolorization and degradation of selected organic dyes and other important pollutants. Other types of textile-bound nanozymes can be prepared and used as low-cost catalysts for a variety of applications.
目前，在许多科学技术领域中，天然和固定化的纳米颗粒都具有重要意义。在本文中，我们研究了磁性氧化铁纳米颗粒及其在梭织棉织物上的聚集体，采用了两种简单的修饰方法。一种修饰方法是基于用甲醇稀释的过氯酸稳定的磁性流体处理纺织品，然后干燥。第二种方法是基于在高 pH 值下微波辅助转化硫酸亚铁，然后干燥。详细分析了这些改性纺织品的结构和功能特性。天然和改性纺织品的扫描电子显微镜清楚地显示了改性棉纤维表面存在氧化铁纳米颗粒。所有改性的纺织材料都呈现出从浅棕色到深棕色的颜色，具体取决于结合的氧化铁颗粒的数量。磁性测量表明，饱和磁化值反映了改性纺织品中存在的磁性纳米颗粒的数量。对天然和磁性改性纺织品进行了小角 X 射线和中子散射测量，以对纳米级结构进行详细的结构表征，并得出了两种纺织样品中纳米颗粒不同结构组织的结论。当使用二乙基对苯二胺硫酸盐作为底物时，纺织结合的氧化铁颗粒表现出过氧化物酶样活性；这种纳米酶活性使在存在过氧化氢的情况下，结晶紫迅速褪色。如果需要，只需添加一段磁性铁丝，就可以增加改性纺织品的磁性响应，从而在纺织品上沉积足够数量的氧化铁颗粒，实现从大量溶液中简单地磁性分离。固定化纳米酶的制备简单，所有前体的成本低廉，使其能够广泛应用于某些有机染料和其他重要污染物的脱色和降解。还可以制备其他类型的纺织结合纳米酶，并将其用作各种应用的低成本催化剂。
