Nanomaterials (Nov 2021)

Solution Blow Spun Silica Nanofibers: Influence of Polymeric Additives on the Physical Properties and Dye Adsorption Capacity

  • Rosiane Maria da Costa Farias,
  • Lucas Leite Severo,
  • Artur P. Klamczynski,
  • Eliton Souto de Medeiros,
  • Lisiane Navarro de Lima Santana,
  • Gelmires de Araújo Neves,
  • Gregory Melvin Glenn,
  • Romualdo Rodrigues Menezes

DOI
https://doi.org/10.3390/nano11113135
Journal volume & issue
Vol. 11, no. 11
p. 3135

Abstract

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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, Mw = 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 Mw 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 Mw 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.

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