Farias Rosiane Maria da Costa, Severo Lucas Leite, Klamczynski Artur P, Medeiros Eliton Souto de, Santana Lisiane Navarro de Lima, Neves Gelmires de Araújo, Glenn Gregory Melvin, Menezes Romualdo Rodrigues
Laboratory of Materials Technology (LTM), Department of Materials Engineering, Federal University of Campina Grande (UFCG), Av. Aprígio Veloso 882, Campina Grande 58429-900, Brazil.
Western Regional Research Center, United States Department of Agriculture, Agricultural Research Service, Albany, CA 94710, USA.
Nanomaterials (Basel). 2021 Nov 20;11(11):3135. doi: 10.3390/nano11113135.
The physical properties of porous silica nanofibers are an important factor that impacts their performance in various applications. In this study, porous silica nanofibers were produced via solution blow spinning (SBS) from a silica precursor/polymer solution. Two polyvinylpyrrolidone (PVP, M = 360,000 and 1,300,000) were chosen as spinning aids in order to create different pore properties. The effect of their physical properties on the adsorption of methylene blue (MB) in an aqueous solution was explored. After forming, the nanofibers were calcined to remove the organic phase and create pores. The calcined nanofibers had a large amount of micro and mesopores without the use of additional surfactants. The molecular weight of the PVP impacted the growth of silica particles and consequently the pore size. High M PVP inhibited the growth of silica particles, resulting in a large volume of micropores. On the other hand, silica nanofibers with a high fraction of mesopores were obtained using the lower M PVP. These results demonstrate a simple method of producing blow spun silica nanofibers with defined variations of pore sizes by varying only the molecular weight of the PVP. In the adsorption process, the accessible mesopores improved the adsorption performance of large MB molecules.
多孔二氧化硅纳米纤维的物理性质是影响其在各种应用中性能的重要因素。在本研究中，通过溶液吹纺（SBS）法从二氧化硅前驱体/聚合物溶液制备了多孔二氧化硅纳米纤维。选择两种聚乙烯吡咯烷酮（PVP，分子量分别为360,000和1,300,000）作为纺丝助剂，以产生不同的孔性质。探讨了它们的物理性质对水溶液中亚甲基蓝（MB）吸附的影响。成型后，对纳米纤维进行煅烧以去除有机相并形成孔隙。煅烧后的纳米纤维在不使用额外表面活性剂的情况下具有大量的微孔和介孔。PVP的分子量影响二氧化硅颗粒的生长，进而影响孔径。高分子量的PVP抑制二氧化硅颗粒的生长，导致大量微孔的形成。另一方面，使用低分子量的PVP获得了具有高比例介孔的二氧化硅纳米纤维。这些结果表明，通过仅改变PVP的分子量，可提供一种制备具有特定孔径变化的吹纺二氧化硅纳米纤维的简单方法。在吸附过程中，可及介孔改善了大MB分子的吸附性能。
