Enhanced adsorption of cationic Pb(II) and anionic Cr(VI) ions in aqueous solution by amino-modified nano-sized illite-smectite clay

Environmental Science and Pollution Research International
Zhenyuan LiYanmin Wang

Abstract

A raw illite-smectite mixed-layered clay (RI/S) was ground for preparing nano-sized I/S clay (NI/S) and subsequently amino-functionalized via grafting of 3-aminopropyltrithoxysilane (APTES) (NH2-RI/S and NH2-NI/S, respectively). The samples were characterized by particle size analysis, specific surface area measurement, X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared spectroscopy (FTIR), and 29Si nuclear magnetic resonance (29Si NMR). Compared to RI/S, NI/S has a narrow particle size distribution and appears in a platelet-like morphology due to the disintegration/exfoliation of RI/S after grinding. Based on the 29Si NMR spectra, the appearances of tri-silicate units indicate the chemically grafting of APTES molecules on NH2-RI/S and NH2-NI/S, respectively. NH2-NI/S can adsorb greater amounts of Pb(II) cations and Cr(VI) anions rather than NH2-RI/S since NH2-NI/S grafts more amounts of amine groups (-NH2). The isotherm data for adsorption of Pb(II) cations and Cr(VI) anions can be described by the Langmuir model at different temperatures (i.e., 10 °C, 30 °C, and 50 °C), respectively. The maximum adsorption amounts of...Continue Reading

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Citations

Jan 25, 2020·Environmental Science and Pollution Research International·Zhenyuan LiYanmin Wang
Aug 17, 2019·Environmental Science and Pollution Research International·Yiping SuZuotai Zhang
Sep 9, 2021·Environmental Science and Pollution Research International·Targol TeymourianElaheh Kowsari

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