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Functionalisation of mesoporous silica gel with 2-[(phosphonomethyl)-amino]acetic acid functional groups. Characterisation and application

journal contribution
posted on 2023-05-18, 02:32 authored by Caldarola, D, Mitev, DP, Marlin, L, Nesterenko, EP, Brett PaullBrett Paull, Onida, B, Bruzzoniti, MC, De Carlo, RM, Sarzanini, C, Nesterenko, PN
A new complexing adsorbent was prepared by chemical modification of mesoporous silica Kieselgel 60 (dp = 37–63 μm, average pore size 6 nm, specific surface area 425 m2 g−1) with 3-glycidoxypropyltrimethoxysilane and 2-[(phosphonomethyl)amino]acetic acid (PMA), commonly known as glyphosate. The prepared adsorbent was fully characterised using elemental analysis, thermal gravimetric analysis (TGA), acid–base potentiometric titration, Fourier Transform Infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption isotherms at 77 K (BET), scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS). The concentration of bonded PMA groups calculated from the nitrogen content was 0.38 mmol per gram. The adsorption of transition metal ions on PMA functionalised silica (HEPMAS) was studied from aqueous solutions having different pH and the following selectivity was established, Zn(II) < Co(II) < Cd(II) < Mn(II) < Ni(II) < Cu(II). The calculated values of distribution coefficients D for the adsorption of ecotoxic metal ions on HEPMAS are 5.0 × 104, 4.9 × 105 and 2.6 × 104 for Zn(II), Pb(II) and Cd(II), respectively.

History

Publication title

Applied Surface Science

Volume

288

Pagination

373-380

ISSN

0169-4332

Department/School

School of Natural Sciences

Publisher

Elsevier Science Bv

Place of publication

PO Box 211, Amsterdam, Netherlands, 1000 Ae

Rights statement

Copyright 2013 Elsevier B.V.

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  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences

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