Silica Xerogel Modified with Cetyltrimethylammonium Bromide as an Effective Adsorbent for Methyl Orange Dye

Abstract:

The study of water treatment technologies has been growing due to mounting concerns regarding dye contamination. Adsorption-based technologies that use porous materials have been proven useful in water decontamination. However, porous silica xerogels have not been extensively explored as adsorbents for the methyl orange (MO) dye. In this study, the MO-adsorptive behavior of silica xerogels was investigated. Two silica xerogels were synthesized using tetraethyl orthosilicate, and one was modified with cetyltrimethylammonium bromide (CTAB). The adsorptive capacities of the unmodified silica xerogel (SiO₂-UN) and the CTAB-modified silica xerogel (SiO₂-CTAB) were compared. Results showed a better fit to the Langmuir isotherm model, with maximum adsorbed amounts of 1.52 mg g^-1 and 25.5 mg g^-1 for SiO₂-UN and SiO₂-CTAB, respectively. The higher value for SiO₂-CTAB is mainly attributed to the electrostatic interactions between MO and the ammonium groups present in the modified xerogel. A study of the porosities of both xerogels, using N₂ adsorption and desorption isotherms, indicated the samples were mesoporous. These findings suggest that SiO₂-CTAB exhibits favorable MO adsorption and could be employed in future wastewater treatment processes.

• Periodical: Materials Science Forum (Volume 1121)
• Pages: 85-96
• DOI: https://doi.org/10.4028/p-oD9JUF
• Online since: May 2024
• Authors: Gabriel V. Buzato, Pedro H.P. Olívio, Adriano L. Souza*
• Keywords: Adsorption, Cetyltrimethylammonium Bromide, Methyl Orange Dye, Silica Xerogels

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