Purifying Water with Nanofibrous MOF Membranes

  • Author: Irene Maluenda
  • Published: 02 March 2018
  • Copyright: Wiley-VCH Verlag GmbH & Co. KGaA
  • Source / Publisher: Journal of Materials Chemistry A/Royal Society of Chemistry
  • Associated Societies: Royal Society of Chemistry (RSC), UK
thumbnail image: Purifying Water with Nanofibrous MOF Membranes

Water contaminated with heavy metals is an important environmental concern, especially due to the metals’ cumulative effect in organisms. Metal-organic frameworks (MOFs) are coordination networks of metal ions or clusters linked using organic ligands. The combined effects of the organic and inorganic moieties allow tuning the size of the pores and provide high surface area to mass ratios while ensuring that the material is chemically and structurally stable.


Dipak Rana and colleagues, University of Ottawa, Canada, have developed an efficient membrane containing MOFs that can efficiently remove Pb2+ and Hg2+ ions by filtration of contaminated water solutions. MOF 808, containing Zr6 clusters, and the Fe-based MOF-F300 were enmeshed in nanofibers of polyacrylonitrile (PAN) and polyvinylidene fluoride (PVDF).


The team concluded that the adsorption of the metals was due to a combination of competitive ion exchange, electrostatic interactions, and pore filling of the MOFs. Removal of Hg2+ and Pb2+ was achieved under controlled acid conditions. The experiments demonstrated that the total negative charge of the deprotonated COOH groups at the metal clusters drags the positive metal ions from the surface into the pore cavity. This was shown by a continuous decrease of the pH as the heavy metal ions promoted the release of protons.


 

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2 Comments

GOVIND SETHIA wrote:

Purifying Water with MOF Membranes

Excellent piece of work from Rana and Matsuura research Group from the University of Ottawa.

The beauty of the work is the cumulative effect of competitive ion exchange, electrostatic interactions, and pore-filling of the MOFs for the removal of heavy metals. Utilizing different phenomenon and developing a hybrid system is a brilliant approach for the effective water treatment.

With increasing demand for clean water, no doubt in future clean water is going to be our next oil, and the demand for the easy, energy efficient and economic clean water technologies will only be a solution to fulfil this requirement for the increasing industrialization and world population.

Tue Apr 24 06:19:27 UTC 2018

Tarun Tapan Roy wrote:

Metal-organic frameworks supported on nanofibers to remove heavy metals

Removal of heavy metal ions (like Hg2+ and Pb2+) from contaminated water with the membrane containing Fe(III) and Zr(IV) based metal-organic frameworks that enmeshed in polyacrylonitrile and polyvinylidene fluoride electro-spun nanofibers have successfully developed by Rana e tal. This filtration technique will be more useful than ion exchange, electrostatic interaction and other traditional methods. So, I have strongly recommended this adsorption technique to publish in daily newspapers to aware public.

Fri Apr 20 07:58:01 UTC 2018

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