ID
× COMMENTARYCOVER STORYIN THE NEWSNEWSFRONTSCHEMENTATOR + Show More
Chementator Briefs
Polyesters Customizing the macroscale properties of polyesters by using sidechain…
BUSINESS NEWSTECHNICAL & PRACTICALFEATURE REPORTFACTS AT YOUR FINGERTIPSTECHNOLOGY PROFILEENGINEERING PRACTICEENVIRONMENTAL MANAGEREQUIPMENT & SERVICESFOCUSNEW PRODUCTS + Show More SHOW PREVIEWS

Comment

Remove pollutants from wastewater with this nano-tailored coating

By Paul Grad |

Researchers from the Agency for Science, Technology and Research (A*STAR, Singapore; www.a-star.edu.sg) have developed low-cost, environmentally friendly iron-hydroxide coatings with unique fin-like shapes that absorb large amounts of pollutants, such as dyes, from drinking water, by means of a simple dipping procedure.

Iron hydroxides are being increasingly used instead of conventional activated charcoal (AC), because AC does not easily remove heavy metals and bulky organic compounds from water. Ion hydroxides, on the other hand, can form stable bonds to those pollutants. If iron particles are turned into nanomaterials their, active surface areas are increased, which enhances their chemical adsorption capability. However, it remains difficult to separate iron hydroxide particles from water, which is necessary due to their toxicity.

To overcome this drawback, the researchers synthesizing iron-hydroxide coatings with a hierarchy of structural features, from nano- to micrometer scales, by electrodeposition of aqueous metal ions onto nickel foam at mild voltages. Electron microscopy shows that the coating’s nanostructure has elongated, fin-like protrusions, which enable the immobilized nanoparticles to maintain a high active surface area for effective pollutant removal.

The researchers observed that this material safely traps and removes contaminants by immersion in dirty water, and can then be regenerated by means of a simple chemical treatment. For example, they tested the material in water contaminated by a Congo red dye. Within 30 min., the water turned almost colorless, with more than 90% of the dye attached to the special coating. Even though these coatings have some of the highest capacities ever reported, they are only operating at a fraction of their theoretical capacity, the researchers say.

Related Content
Highly reinforced low-VOC coatings
This company has introduced a new range of low-VOC coatings that provide 100%-solids epoxy lining performance. The coatings are reinforced…
Weftec 2017 Show Preview
From September 30 to October 4, the Water Environment Federation (Alexandria, Va.; www.wef.org), will host the Weftec 2017 Conference and…

Chemical Engineering publishes FREE eletters that bring our original content to our readers in an easily accessible email format about once a week.
Subscribe Now
Purdue University Saves $400,000 Annually with Local Vacuum Networks
Bag filter Housings/Vessels
Innovative Backwashable Media Filter
Automated Vertical Tower Filter Press
Visit VACUUBRAND at ACS in San Francisco!

View More

Live chat by BoldChat