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Composite polyester membranes with embedded dendrimer hosts and bimetallic Fe/Ni nanoparticles: synthesis, characterisation and application to water treatment

Malinga, S. P. and Arotiba, O. A. and Krause, R. W. M. and Mapolie, S. F. and Diallo, M. S. and Mamba, B. B. (2013) Composite polyester membranes with embedded dendrimer hosts and bimetallic Fe/Ni nanoparticles: synthesis, characterisation and application to water treatment. Journal of Nanoparticle Research, 15 (6). Art. No. 1698. ISSN 1388-0764 . https://resolver.caltech.edu/CaltechAUTHORS:20130627-145213384

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Abstract

This study describes the preparation, characterization and evaluation of new composite membranes with embedded dendrimer hosts and Fe/Ni nanoparticles. These new reactive membranes consist of films of cyclodextrin–poly(propyleneimine) dendrimers (β-CD–PPI) that are deposited onto commercial polysulfone microporous supports and crosslinked with trimesoyl chloride (TMC). The membranes were subsequently loaded with Fe/Ni nanoparticles and evaluated as separation/reactive media in aqueous solutions using 2,4,6-trichlorophenol as model pollutant. The morphology and physicochemical properties of the composite membranes were characterised using high-resolution transmission electron microscopy (HR-TEM), atomic force microscopy and measurements of contact angle, water intake, porosity and water permeability. The sorption capacity and catalytic activity of the membranes were evaluated using ion chromatography, atmospheric pressure chemical ionisation-mass spectrometry and UV–Vis spectroscopy (UV–Vis). The sizes of the embedded Fe/Ni nanoparticles in the membranes ranged from 40 to 66 nm as confirmed by HR-TEM. The reaction rates for the dechlorination of 2,4,6-trichlorophenol ranged from 0.00148 to 0.00250 min^(−1). In all cases, we found that the reaction by-products consisted of chloride ions and mixtures of compounds including phenol (m/z = 93), 2,4-dichlorophenol (m/z = 163) and 4-chlorophenol (m/z = 128). The overall results of this study suggest that β-CD–PPI dendrimers are promising building blocks for the synthesis of composite and reactive membranes for the efficient removal of chlorinated organic pollutants from water.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/s11051-013-1698-y DOIUNSPECIFIED
http://link.springer.com/article/10.1007%2Fs11051-013-1698-yPublisherUNSPECIFIED
Additional Information:© 2013 Springer Science+Business Media Dordrecht. Received: 27 November 2012; Accepted: 4 May 2013; Published online: 21 May 2013. The author would like to thank the University of Johannesburg new generation scholarship for funding.
Funders:
Funding AgencyGrant Number
University of Johannesburg UNSPECIFIED
Subject Keywords:beta-Cyclodextrin; Fe/Ni nanoparticles; Poly (propyleneimine) dendrimer; Polysulfone; 2,4,6-Trichlorophenol
Issue or Number:6
Record Number:CaltechAUTHORS:20130627-145213384
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20130627-145213384
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:39128
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:28 Jun 2013 15:07
Last Modified:03 Oct 2019 05:04

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