Glauconite clay-functionalized chitosan nanocomposites for efficient adsorptive removal of fluoride ions from polluted aqueous solutions

Abstract

<p>We herein have developed a mild approach for the fabrication of glauconite clay (G)-modified chitosan (CS) nanocomposites by the combination of a simple blending and crosslinking method.</p>

Adsorptive Removal of Manganese Ions From Polluted Aqueous Media by Glauconite Clay- Functionalized Chitosan Nanocomposites: Adsorption, Kinetic, Isotherm, and Thermodynamic Investigations

“…In our earlier studies, we reported on the preparation of glauconite clay (G), cross-linked chitosan/glauconite clay (GL-CS/G), EDTA-chitosan modified glauconite (EDTA-GL-CS/G), and surfactant-modified chitosan/glauconite (CTAB-CS/G and SDS-CS/G) composites (2). We also reported previously on the characterization of these materials using different techniques including Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), nitrogen physical adsorption (BET), atomic absorption spectrophotometry (AA), and thermal gravimetric analysis (TGA).…”

“…The Langmuir and Freundlich isotherm constants are listed in Table (2). Furthermore, qm can be computed from the Freundlich isotherm model according to Eqn.…”

“…Obviously, from the data listed in Table (2), the adsorption process can be described well Besides, the negatively charged hydrophilic heads (sulfonate groups (-OSO3-)) of the anionic SDS surfactant might increase the negative surface potentially when they pointed towards the bulk of the solution; and consequently resulting in a strong electrostatic attraction of Mn(II) ions.…”

“…Heavy metals are considered one of the main sources of industrial wastewater pollution, which seriously menace the human health and the biological environment. It is necessary to remove the inorganic pollutants from wastewater before being discharged into the environment due to their high stability and non-degradable nature (1,2). Although some heavy metals such as manganese, copper, iron, and zinc are essential for human health under particular concentrations, but above these concentrations they become toxic and cause various health problems (3).…”

Сорбционные Свойства Модифицированного Глауконита

“…Хитозан модифицировали этилендиаминтетрауксусной кислотой, глутаровым альдегидом, додецилсульфатом натрия и цетилтриметиламмоний бромидом. Максимальное значение адсорбционной емкости 9.03 мг/г показал последний сорбент [13]. Представлены результаты исследования селективности сорбции цезия природным и поверхностно-модифицированным глауконитом в зависимости от концентраций солей калия и аммония.…”