Imperial College London
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Emeritus ProfessorNigelGraham

Faculty of Engineering, Department of Civil and Environmental Engineering

Senior Research Investigator
 
 
 
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Contact

 

n.graham Website

 
 
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Assistant

 

Miss Judith Barritt +44 (0)20 7594 5967

 
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Location

 

406Skempton BuildingSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Wang:2020:10.1016/j.cej.2019.123769,
author = {Wang, J and Yu, W and Graham, NJD and Jiang, L},
doi = {10.1016/j.cej.2019.123769},
journal = {Chemical Engineering Journal},
pages = {1--14},
title = {Evaluation of a novel polyamide-polyethylenimine nanofiltration membrane for wastewater treatment: Removal of Cu2+ ions},
url = {http://dx.doi.org/10.1016/j.cej.2019.123769},
volume = {392},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - This paper describes a novel approach for enhancing membrane technology for the removal of heavy metal cations in contaminated waters. A simple method of forming a positively charged polyamide (PA) nanofiltration (NF) membrane has been developed by attaching a layer of hyperbranched polyethylenimine (PEI) to the PA surface, involving the linking of PEI amino groups to the PA surface carboxyl groups. The nature of the PEI modified PA membrane, in terms of surface morphology, zeta potential and hydrophobicity was found to depend on the PEI molecular weight (MW), and the PEI concentration and membrane exposure time during preparation. In turn, the nature of the modified membrane determined its performance in terms of hydraulic flux and metal ion rejection. In tests using a model solution of 5 mg/L Cu2+ and a 70,000 MW PEI membrane the Cu rejection was >90%, with only a modest reduction in flux compared to blank water. The Cu2+ rejection was found to be a combination of electrostatic repulsion and adsorption, with the relative proportions depending on the nature of the PEI modified PA membrane. In addition, the Cu2+ rejection and membrane flux were found to be sustainable over repeated filtration cycles, and the rejection was not adversely affected by the presence of humic acid in solution (5 mg/L).
AU  - Wang,J
AU  - Yu,W
AU  - Graham,NJD
AU  - Jiang,L
DO  - 10.1016/j.cej.2019.123769
EP  - 14
PY  - 2020///
SN  - 1385-8947
SP  - 1
TI  - Evaluation of a novel polyamide-polyethylenimine nanofiltration membrane for wastewater treatment: Removal of Cu2+ ions
T2  - Chemical Engineering Journal
UR  - http://dx.doi.org/10.1016/j.cej.2019.123769
UR  - https://www.sciencedirect.com/science/article/pii/S1385894719331845?via%3Dihub
UR  - http://hdl.handle.net/10044/1/75837
VL  - 392
ER  -
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