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

Citation

Caldarola, D and Mitev, DP and Marlin, L and Nesterenko, EP and Paull, B and Onida, B and Bruzzoniti, MC and De Carlo, RM and Sarzanini, C and Nesterenko, PN, Functionalisation of mesoporous silica gel with 2-[(phosphonomethyl)-amino]acetic acid functional groups. Characterisation and application, Applied Surface Science, 288 pp. 373-380. ISSN 0169-4332 (2014) [Refereed Article]

Copyright Statement

Copyright 2013 Elsevier B.V.

DOI: doi:10.1016/j.apsusc.2013.10.035

Abstract

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.

Item Details

Item Type:Refereed Article
Keywords:chemically modified silica, glyphosate, 2-[(phosphonomethyl)amino]acetic acid, functionalisation, metal removal, chelation
Research Division:Chemical Sciences
Research Group:Analytical Chemistry
Research Field:Separation Science
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Chemical Sciences
Author:Caldarola, D (Mr Dario Caldarola)
Author:Mitev, DP (Dr Dimitar Mitev)
Author:Paull, B (Professor Brett Paull)
Author:Nesterenko, PN (Professor Pavel Nesterenko)
ID Code:93670
Year Published:2014
Web of Science® Times Cited:10
Deposited By:Austn Centre for Research in Separation Science
Deposited On:2014-08-12
Last Modified:2017-10-27
Downloads:0

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