Imperial College London
Alternate

ProfessorDarylWilliams

Faculty of Engineering, Department of Chemical Engineering

Professor of Particle Science
 
 
 
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Contact

 

+44 (0)20 7594 5611d.r.williams Website

 
 
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Location

 

439ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Mohd:2021:10.1016/j.chemosphere.2020.128072,
author = {Mohd, Azmi LH and Williams, D and Ladewig, B},
doi = {10.1016/j.chemosphere.2020.128072},
journal = {Chemosphere},
pages = {1--9},
title = {Polymer-assisted modification of metal-organic framework MIL-96 (Al): influence of HPAM concentration on particle size, crystal morphology and removal of harmful environmental pollutant PFOA},
url = {http://dx.doi.org/10.1016/j.chemosphere.2020.128072},
volume = {262},
year = {2021}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve >200% particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems.
AU  - Mohd,Azmi LH
AU  - Williams,D
AU  - Ladewig,B
DO  - 10.1016/j.chemosphere.2020.128072
EP  - 9
PY  - 2021///
SN  - 0045-6535
SP  - 1
TI  - Polymer-assisted modification of metal-organic framework MIL-96 (Al): influence of HPAM concentration on particle size, crystal morphology and removal of harmful environmental pollutant PFOA
T2  - Chemosphere
UR  - http://dx.doi.org/10.1016/j.chemosphere.2020.128072
UR  - https://www.sciencedirect.com/science/article/pii/S0045653520322670?via%3Dihub
UR  - http://hdl.handle.net/10044/1/82705
VL  - 262
ER  -
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