Adsorption of quinoline yellow from aqueous solution by silica gel modified with cetylpyridinium chloride
DOI:
https://doi.org/10.15276/opu.2.64.2021.06Keywords:
quinoline yellow, silica, cetylpyridinium chloride, adsorption, spectrophotometryAbstract
In the current paper, adsorbent based on silica gel L 5/40 modified with cetylpyridinium chloride for the effective preconcentration of anionic food dye quinoline yellow from dilute aqueous solutions was proposed. The presence of cetylpyridinium cations on the silica gel surface was confirmed by the diffuse reflectance infrared fourier transform spectroscopy method. The adsorption conditions of quinoline yellow from dilute aqueous solutions with the proposed adsorbent were studied and optimized. It is shown that the use of modified silica gel allows efficient (>95 %) extraction of quinoline yellow from aqueous solutions. Under optimal sorption conditions (pH 2, sorbent dosage 0.2 g and sorption time is 15 min), the adsorption capacity of modified adsorbent was determined. It is shown that, with increasing temperature, a change in the isotherm type from the L-type to the H-type is observed. It was shown that adsorption isotherms were well described by the Langmuir equation. Thermodynamic studies have made it possible to establish the spontaneous sorption.The desorption of qunoline yellow from the surface of silica gel modified with cetylpyridinium chloride was studied. It is shown that when using solutions of sulfuric acid, sodium hydroxide and distilled water, desorption does not occur. It was shown that the most effective eluent is a 0.001 mol/L solution of sodium dodecyl sulfate in 0.1 mol/L ammonium hydroxide, and desorption of quinoline yellow occurs due to the destruction of ion pairs of dye anions with cetylpyridinium cations fixed on the surface. The data obtained can then be used to develop a test system for determination of quinoline yellow via corresponding colorimetric scales or for quantitative solid phase extraction and adsorption-spectroscopic quantification of quinoline yellow in some real samples.
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