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- W3199826077 abstract "In this work, sodium bentonite was silylated with 3-aminopropyltrimethoxysilane (APTMS) under microwave irradiation at 50 °C at different times (5, 10 and 15 min). Silylation was performed in presence and absence of ethylene glycol. Infrared and 29Si NMR spectroscopies were used to monitor the grafting process, while the degree of functionalization was calculated by using CHN elemental analysis and thermogravimetry. X-ray diffraction and transmission electron microscopy (TEM) were carried out to evaluate alterations in the basal spacing. The silylation degree of bentonite was higher at short reaction time. The modified solids were used to remove Cu(II) from aqueous solutions. Parameters such as contact time and initial cation concentration for the Cu(II) were investigated. Fast copper retention occurred in the pristine and silylated solids with saturation time of 40 min and maximum adsorption capacity of 1.54 mmol g−1 for organofunctionalized sample. The adsorption equilibrium data were fitted using the Langmuir and Freundlich isotherms. Zeta potential measurements, UV–vis spectra and X-ray spectroscopy were used to understand the adsorption mechanism. The silylated solids obtained by microwave irradiation behaved as good sorbents for rapid Cu(II) removal from aqueous solution." @default.
- W3199826077 created "2021-09-27" @default.
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- W3199826077 date "2021-12-01" @default.
- W3199826077 modified "2023-09-25" @default.
- W3199826077 title "Aminopropyl bentonites obtained by microwave-assisted silylation for copper removal" @default.
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- W3199826077 doi "https://doi.org/10.1016/j.colsurfa.2021.127557" @default.
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