Efficient Entrapment of Dye in Hollow Silica Nanoparticles: Direct Evidence Using Fluorescence Spectroscopy
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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.
KeywordsHollow silica Rhodamine B Entrapment Fluorescence spectroscopy Red shift Encapsulation
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.
- 1.Helmer R, Hespanhol I (1997) Water pollution control—a guide to the use of water quality management principles. E & FN Spon, LondonGoogle Scholar
- 2.Hildebrand H, Mackenzie K, Kopinke FD (2008) Novel nano-catalysts for wastewater treatment. Global NEST J 10:47–53Google Scholar
- 5.Tiwari DK, Behari J, Sen P (2008) Application of nanoparticles in waste water treatment. World App Sci J 3:417–433Google Scholar
- 22.Vaidya S, Thaplyal P, Ganguli AK (2011) Uptake of hydrophilic toxins in hollow silica shells obtained from core-shell nanostructures. Proc Indian Natn Sci Acad 77:99–103Google Scholar
- 30.de Boer JH (1958) The structure and properties of porous materials. Butterworth, LondonGoogle Scholar