Especially as an adsorbent for removal of water pollutants & through some light on encapsulation stabilization of water contaminant/pollutants by ZVI (zero valent iron).
Pls throw some light on encapsulation stabilization of water contaminant/pollutants by ZVI (zero valent iron)
The Department of Water Quality Control at the Institute for Environmental Engineering, Technical University Berlin, Germany and has been very active in this field.
To my knowledge ZVI (zero valent iron) is used on carbonaceous material like activated carbon to enhance the oxidation and reduction of pollutants present in the water. so the ZVI per se is not the actual absorbant but used to degrade absorbed pollutants.
pardon my typo, no need to go into a full rage rampage. I know the difference between AB and AD. You act as if you are infallible. so again,pardon my misspelling.
Sean, I am sure Ewa meant Fe(0). If you look closely, you will see the character after the Fe is an oval (zero), not a circle (Oh). Fe(0) becomes an adsorbent when it corrodes, but it is also (potentially) useful as a reductant (e.g., for chlorinated organic compounds).
Rajendra, I suggest you go to Google Scholar and do searches on ZVI, zero valent iron, and any other related terms you can think of.
Yongheng Huang at Texas A&M ([email protected]) has been working on ZVI for some time. He may even have a commercial application by now. He was doing pilot work at a power plant a few years ago.
For a short introductory review, see Elements, Vol. 6, pp. 395–400
Dear all,
Ewa is right. Metallic iron is a POTENTIAL reducing agent but not in aqueous solutions. I'll not (directly) refer you to my papers but to excellent papers on aqueous iron corrosion by N. Sato from 2000 to 2012...
(http://www.wiley-vch.de/books/sample/3527329307_c01.pdf)
Rajendra, I suggest you read Crane and Scott (2012) in J. Hazard. Mater (Special Issue on nano). you could additionally read Noubactep and Caré (2010) in the same journal.
Noubactep C., Caré S. (2010): On nanoscale metallic iron for groundwater remediation. J. Hazard. Mater. 182 (1-3), 923–927.
Noubactep C., Caré S., Crane R.A. (2012) : Nanoscale metallic iron for environmental remediation: prospects and limitations. Water Air Soil Pollut. 223 (3), 1363–1382.
Rajendra,
here is my answer: nano-ZVI is an efficient generator of adsorbing agents for contaminant removal (reducing agents are also generated but our goal is contaminant removal). The most suitable contaminants are those with high adsorptive capacities to iron corrosion products. But all other species will be removed by a co-precipitation mechanism (given the abundance of very reactive nZVI - even dispersed). The extent of contaminant removal depends (beside the affinity to iron corrosion products) on: (i) the kinetics of nZVI oxidation, (ii) the extent of water pollution and the contact time (mixing intensity in btach or flow rate in columns).
I would like to add that giving the adsorption/removal capacity of nZVI in mg of contaminant per g of nZVI (mg/g) like for pure adsorbents is a mistake. You can not define (experimentally obtained) a "capacity" before the used reactive material is depleted. For pure (non-reactive) adsorbents, there is no problem because the whole mass of adsorbent is available at the begining of the experiment.
Good luck!
Chicgoua
You might find of interest also the research conducted in the project "NanoRem - Taking Nanotechnological Remediation Processes from Lab Scale to End User Applications for the Restoration of a Clean Environment". It is a research project, funded through the European Commission FP7 which focuses on facilitating practical, safe, economic and exploitable nanotechnology for in situ remediation. See www.nanorem.eu for a project outline, partners and contact details as well as results coming up from the project.
http://www.nanorem.eu
Book A Risk/Benefit Appraisal for the Application of Nano-Scale Z...
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