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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Innovative research work for the society

Excellent work done by the Dr. Rana and his team for the removal of heavy metal from the drinking water. Safe drinking water is one of the basic necessities for the society. Current commercial method to remove heavy metals tends to be costly, and not efficient enough. The application of nanofibrous MOF membrane has shown a new avenue for removal of toxic heavy metal and make the water drinkable. The technology is in the process of commercialisation and definitely a boon for the society. Congratulations to Dr. Rana and his team and wish you best for future research.

Wed Nov 28 01:33:25 UTC 2018

Ritesh Tailor wrote:

Innovative work for water treatment

Dr. Johnson, Dr. Dipak Rana and his group have a great contribution in developing a quality membrane for the treatment of polluted water. Their discovery of Nanofibrous MOF membrane has opened an excellent approach to deal with heavy metal water pollution. The multiple interactions e.g. ion exchange, electrostatic interactions, pore filling and surface adsorption nature of the membrane has provided an ultra-high adsorption property. The important part of their research is the re-usability of the membrane with adequate capacity for drinkable water treatment which makes it more attractive for commercialization point of view. Authors are still expecting to get improvement over their current innovative discovery. A big congratulation to an amazing talented group. Wish you all the best for future.

Sat Nov 24 18:04:41 UTC 2018

Sandipan Dutta wrote:

Nanofibrous MOF for water purification

Interesting work done by the authors is an important addition to technological options to clean contaminated water. Reported regeneration and filtering efficiency self explains its potential. Congratulations to Dr. Rana and the team for excellent work.

Tue Nov 13 15:36:56 UTC 2018

Narayan Sinha wrote:

Excellent research on removal of heavy metal ions from aqueous solution

Accessibility of clean water is a basic human right. However, billions of people in the world do not have the access of potable water and they are forced to live by drinking unsafe water which causes them illness and life-threatening diseases. Among others, heavy metal (e.g., lead, mercury, arsenic, etc.) contamination is one of the major areas of water pollution. Therefore, a large number of scientists in all over world are focused on the development of methodologies and technologies for improved water purification systems. Very recently, Dr. Rana and co-workers (University of Ottawa) have reported an efficient method based on nanofibrous MOF material which can remove toxic metal ions like mercury and lead ions from non-drinkable aqueous solution, making it drinkable, clean water. The adsorption quality of the membrane is very high and even after four cycles of adsorption and desorption, still more than 90% adsorption quality of the nanofibrous MOF membrane is retained. I personally think that it a great research work. I strongly recommend Dr. Rana and his group members to use this methodology in the water purification systems and try to commercialize their material.

Wed Nov 07 16:59:31 UTC 2018

pankaj kaware wrote:

A new perspective of Green Technology by Dr. Dipak Rana and colleagues

From the perspective of the world-wide problem of safe drinking water due to contamination of groundwater by leached out heavy metals ions (HMIs), this innovative research is very welcomed. Human body needs some heavy metals like iron (e.g. hemoglobin, cytochrome), zinc (e.g. Zn finger proteins), copper (e.g. Cu proteins), manganese (e.g. Mn-dependent superoxide dismutase), cobalt (e.g. cobalamin, B12), molybdenum (Mo oxo transferase), etc., however, the toxicity increases when present in higher amount, for example exposure to mercuric salt could have toxicological effects on gastrointestinal tract and kidney, lead(II) has been demonstrated to cross blood-brain barrier that effects the central nervous system. The developed metal organic frameworks (MOFs) with nano-fibrous adsorbent has been found to a high absorption capacity of 53.1 mg/g (MOF-808) to 42.6 mg/g (F-300) for Hg+2, and 30.2 mg/g (MOF-808) to 17.2 mg/g (F-300) for Pb+2, respectively. Furthermore, the activated MOF-808 with nano-fibrous adsorbent has also been found to be a high absorption capacity of 43.9 mg/g for Cd+2 and 56.7 mg/g for Zn+2. Therefore, I sincerely believe the research will have a new contribution to the field of abatement of HMIs contamination problem of drinking water.

Tue Aug 28 00:43:31 UTC 2018

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