Abstract
Silica nano hollow sphere was successfully modified to βCD-SNHS as a new adsorbent to remove methylene blue (MB) (as a model) from aqueous solution. Adsorption behaviors of dyes (MB) onto βCD-SNHS were studied from equilibrium and kinetic viewpoints. The equilibrium data could be well described by several isotherms. The βCD-SNHS nanoparticles contributed to the enhancement of the adsorption capacities because of the strong abilities of the hydroxyl groups and the inner cores of the hydrophobic cavity in βCD to form complexes with organic pollutants. Thus, the synthesized βCD-SNHS particles can be a potential material for in situ remediation of contaminated surface and ground water. The prepared nanoparticle adsorbents were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and N2 adsorption–desorption measurement (BET). The prepared nanoparticles have 40–100nm diameters.Host–guest interactions between cyclodextrin and organic molecules had a great contribution to the adsorption of organic pollutants. These nanoparticles could be applied in the elimination, enrichment and detection of some environmental pollutants. The equilibrium data were modeled using seven isotherm models and fit well to the Toth model. The kinetic results were followed to modified pseudo-n-order (MPnO). The adsorption of MB onto βCD-SNHS was found to be dependent on pH.
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