Multi-response optimization of ultrasound-assisted competitive adsorption of dyes onto γ-Fe2O3 nanoparticles loaded on activated carbon: central composite design
The focus of this study is on the practical use of a reasonable and eco-friendly adsorbent such as γ-Fe2O3 nanoparticles loaded on activated carbon (γ-Fe2O3-NPs-AC) in fast ultrasound-assisted elimination of Thymol blue (TB) dyes and Azur B (AB) from aqueous solutions. The sorbent was characterized...
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Veröffentlicht in: | Desalination and water treatment 2023-05, Vol.295, p.217-226 |
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Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The focus of this study is on the practical use of a reasonable and eco-friendly adsorbent such as γ-Fe2O3 nanoparticles loaded on activated carbon (γ-Fe2O3-NPs-AC) in fast ultrasound-assisted elimination of Thymol blue (TB) dyes and Azur B (AB) from aqueous solutions. The sorbent was characterized by field-emission scanning electron microscope, X-ray diffraction and Fourier-transform infrared spectroscopy. The effects of pH, sorbent mass, sonication time, eluent volume, and contributions to the response correspond to simultaneous pre-enrichment, determination of TB and AB were optimized by response surface methodology, results were compared with the experimental values. While the superiority of the Langmuir model in explaining the equilibrium data has been demonstrated, pseudo-second-order kinetic equations are well established to describe the adsorption of AB and TB. The high adsorption capacity of the two-component system removes both dyes by more than 99% at high speed (70 mg/g for AB and 45 mg/g for TB) using a small amount of adsorbent. Due to its simplicity and speed, the developed method can successfully perform reproducible and accurate monitoring of analytes of interest from complex matrices. |
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ISSN: | 1944-3986 |
DOI: | 10.5004/dwt.2023.29578 |