Mesoporous Silica Particles Functionalized With Poly(Glycidyl Methacrylate) Brushes Cross-linked With Ethanolamine to Potentially Enhance Pollutant Removal From Contaminated Water Systems
Water pollution caused by synthetic dyes and industrial effluents poses a significant environmental challenge. Among these dyes, methyl orange (MO), widely used in the textile and printing industries, stands out as one of the most persistent and toxic pollutants due to its complex aromatic structure...
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| Main Author: | |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2025-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/joch/3319150 |
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| Summary: | Water pollution caused by synthetic dyes and industrial effluents poses a significant environmental challenge. Among these dyes, methyl orange (MO), widely used in the textile and printing industries, stands out as one of the most persistent and toxic pollutants due to its complex aromatic structure and resistance to biodegradation. Its presence in aquatic environments leads to serious ecological and health concerns, underscoring the urgent need for developing efficient and selective adsorbent materials for effective wastewater treatment. In this study, mesoporous silica particles (MSPs) were synthesized and functionalized with poly(glycidyl methacrylate [GMA]) (PGMA) brushes cross-linked with ethanolamine (MSPs-PGMA-x-ETA) to enhance dye adsorption performance. The surfaces of silica particles were first modified with (3-glycidoxypropyl)trimethoxysilane (GPTS) and treated with concentrated hydrochloric acid to produce hydroxyl groups. Then, the surface was reacted with 2-bromo-2-methylpropionyl bromide to produce atom transfer radical polymerization (ATRP) initiator sites. A high grafting of PGMA brush was obtained, followed by cross-linking with ethanolamine (MSPs-PGMA-x-ETA), as an adsorbent. The newly developed sorbent was subject to thorough characterization through a variety of physicochemical techniques, including FTIR and TEM. These analyses provided detailed insights into the structural and chemical attributes of the sorbents. The adsorptive performance of the sorbent was evaluated under a range of experimental conditions, focusing on parameters such as the pH of the solution, the contact time with the dye, and the initial concentration of MO. The optimal adsorption capacity observed was ca. 63 mg·g−1 of MO at a dye concentration of 100 mg·L−1, with a contact time of 150 min being sufficient for effective dye removal. Extensive adsorption studies indicated that the process adhered to the Langmuir adsorption isotherm, suggesting that adsorption occurs via a monolayer formation on distributed sites across the MSPs-PGMA-x-ETA’s surface. Furthermore, the kinetics of the adsorption were best described by the pseudosecond-order model, indicating that the rate-determining step might involve chemisorption. |
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| ISSN: | 2090-9071 |