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Efficient Entrapment of Dye in Hollow Silica Nanoparticles: Direct Evidence Using Fluorescence Spectroscopy

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Abstract

Using hollow silica nanoparticles we demonstrate a simple and highly efficient way of removing hydrophilic dye (Rhodamine B) from water by encapsulation within these hollow spheres. The hollow silica spheres were obtained by using a surfactant templated procedure. Using fluorescence spectroscopy, we also show the evidence of the dye being absorbed within the hollow core of the silica shell (which is crucial for many applications) and differentiate from the adsorption of dye on the surface of the silica shell. It was found that that up to 94 % of the hydrophilic dye could be entrapped using these hollow shells within 72 h of exposure. Fluorescence spectroscopy shows a red shift in the dye encapsulated in the hollow silica which is due to aggregation of the dye and enables us to follow quantitatively the uptake of the dye molecules by the silica shells with time. The evidence for the encapsulation of the dye in these hollow spheres was reinforced by carrying out a comparative study, using solid silica particles.

Evidence of encapsulation of dye in hollow silica by fluorescence spectroscopy

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Acknowledgment

A.K.G. thanks the Department of Science & Technology, Govt. of India, and DEITY, Govt. of India, for financial support. A.B.. thanks UGC for a fellowship.

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Authors and Affiliations

  1. Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India

    Arabinda Baruah, Sandeep Kumar & Ashok K. Ganguli

  2. Department of Chemistry, Hindu College, University of Delhi, Delhi, 110007, India

    Sonalika Vaidya

  3. Institute of Nano Science & Technology, Habitat Centre, Phase- X, Sector-64, Mohali, Punjab, 160062, India

    Ashok K. Ganguli

Authors
  1. Arabinda Baruah
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  2. Sandeep Kumar
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  3. Sonalika Vaidya
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  4. Ashok K. Ganguli
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Corresponding author

Correspondence to Ashok K. Ganguli.

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Figure S1

PXRD pattern of hollow silica particles. (DOCX 64 kb)

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Baruah, A., Kumar, S., Vaidya, S. et al. Efficient Entrapment of Dye in Hollow Silica Nanoparticles: Direct Evidence Using Fluorescence Spectroscopy. J Fluoresc 23, 1287–1292 (2013). https://doi.org/10.1007/s10895-013-1262-2

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  • DOI: https://doi.org/10.1007/s10895-013-1262-2

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