Structural Modifications of Surfactant-Assisted Alumina and Their Effectiveness for the Removal of Dyes

Document Type: Research Article

Authors

Department of Chemistry, University of Karachi 75270, PAKISTAN

Abstract

The current study focuses on the development of the modified surface of the alumina by anionic surfactant sodium dodecyl sulfate. The synthesized Surfactant Modified Alumina (SMA) effectively associated with dye molecules and amended their properties. The triphenylmethane (CBB) and thiazine dyes (MB) were selected as a simulated dye wastewater system. The removal was carried out by adsorption method under the optimized amount of adsorbent dosage,
the concentration of adsorbate, contact time and temperature. The adsorption isotherm models like Langmuir, Freundlich and Dubinin Radushkevish were employed. The mechanism of the interaction represents the decolorized leuco dye molecules were formed after adsorption. Moreover, the thermodynamic parameters like (∆S°), (∆H°) and (∆G°) were calculated represents the endothermic and spontaneous nature of the adsorption process. The pH at the point of zero charges (pHPZC) was determined. The photocatalytic degradation of respective dye systems was also observed.
The surface morphology of (SMA) was determined by FTIR and SEM techniques. Whereas the pseudo-second-order kinetics model was followed in the present system. The Pearson Correlation Coefficient was conjointly applied. The removal efficiency was ascertained to be 99.50% for CBB(R-250) and 95.70% for (MB).

Keywords

Main Subjects


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