6533b823fe1ef96bd127e951

RESEARCH PRODUCT

Preparation and characterization of organofunctionalized bentonite clay bearing aminophosphonic groups in heavy metal uptake

Vladimir ZaitsevOlena ArtiushenkoIryna TomashchukTatiana KovalchukL.s. Kostenko

subject

ChemistryProcess Chemistry and TechnologyMetal ions in aqueous solution02 engineering and technology010501 environmental sciences021001 nanoscience & nanotechnologyGrafting01 natural sciencesPollutionMatrix (chemical analysis)MetalAdsorptionCovalent bondvisual_artBentonitevisual_art.visual_art_mediumChemical Engineering (miscellaneous)Fourier transform infrared spectroscopy0210 nano-technologyWaste Management and Disposal0105 earth and related environmental sciencesNuclear chemistry

description

Abstract 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.

yearjournalcountryeditionlanguage
2019-10-01Journal of Environmental Chemical Engineering
https://doi.org/10.1016/j.jece.2019.103434