Preparation and characterization of organofunctionalized bentonite clay bearing aminophosphonic groups in heavy metal uptake
| Autor: | Vladimir Zaitsev, Olena Artiushenko, Iryna Tomashchuk, Tatiana Kovalchuk, L.S. Kostenko |
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| Rok vydání: | 2019 |
| Předmět: |
Chemistry
Process Chemistry and Technology Metal ions in aqueous solution 02 engineering and technology 010501 environmental sciences 021001 nanoscience & nanotechnology Grafting 01 natural sciences Pollution Matrix (chemical analysis) Metal Adsorption Covalent bond visual_art Bentonite visual_art.visual_art_medium Chemical Engineering (miscellaneous) Fourier transform infrared spectroscopy 0210 nano-technology Waste Management and Disposal 0105 earth and related environmental sciences Nuclear chemistry |
| Zdroj: | Journal of Environmental Chemical Engineering. 7:103434 |
| ISSN: | 2213-3437 |
| Popis: | Bentonite (Bnt) with covalently immobilized N-propylaminodi(methylenephosphonic) groups (Bnt-ADPA) was obtained through a two-step synthesis including aminosilanization and phosphorylation of resulting aminobentonite through Moedritzer-Irani reaction. The grafting of an aminosilane layer in the interplanar space of the bentonite was investigated by XRD, and the presence of N and P-containing groups was confirmed by FTIR, 31P and 29Si MAS NMR. The immobilization of the organic functional groups increased the interplanar distance in bentonite matrix at 52% that essentially improved filtration properties compared to raw bentonite. The number of surface acid groups was evaluated to 0.8 mmol g−1. The obtained adsorbent showed high affinity for heavy metal ions according to pH1/2 sequence Fe (III) (2.3) 97%) elimination of Pb (II) and a significant (59–65%) decrease of the amount of Cu(II) and Zn(II). According to the X-ray fluorescence analysis of the filter, Bnt-ADPA also retained Ca (II), Mn (II) and Sr (II) ions. |
| Databáze: | OpenAIRE |
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