Zero valent iron means unoxidized iron, i.e. it is the same, opposite to iron oxide particles. See no use for phosphates, ammonia and nitrates. Opposite iron oxides will bind phosphates.

Thank you Dr. Sobisch for your response.

According to my literature survey, based on characteristics of Iron Nano particles there is a chance to treat/remove phosphate and nitrates form water.

I want to know that is it possible to use both of them or not, and as you said, there's no different between 'Zero-valent Iron Nano Particles' and 'Iron Nano Particles'.

Could you please tell me what kind of elements or substances (both solid or liquid) we can use to remove/decrease the amount of pollutants (especially Nitrogen and Phosphorus) from water?

Regards

Salar

Dear Salar,

to remove nitrogen and phosphorus from wastewater most efficient are options to allow for reuse as fertilizer. One promising alternative is struvite precipitation under controlled conditions. I would recommend you to read the different issues of the Scope newsletter.

Removal through iron phosphate results in poorly available phosphate.

nZVI reduces nitrate but the reaction is not suited for typical water purification as the product is ammonia.

As nZVI oxidise it forms different hydroxides that can bind phosphor as well the iron ions can precipate as phosphates.

Considering that nZVI are not cheap to produce these reactions are not currently relevant for large scale water treatment.

Article Fate of nitrogen species in nitrate reduction by nanoscale z...

Excuse me, where can i buy Zero valent iron?

Dear Leo

There are lots of companies that provide metal products including Iron. The followings links are some of them:

1)

http://www.sigmaaldrich.com/catalog/product/aldrich/267953?lang=en®ion=US

2)

http://metal-powders-compounds.micronmetals.com/viewitems/high-purity-metal-powders-compounds/iron?

3)

http://www.nanoiron.cz/en/products

4)

http://mknano.com/about.asp

Hope that helps.