Shaking the nanomaterials out: New method to purify contaminated water

Shaking the nanomaterials out
After shaking, the oil and water in the vial separate, trapping unwanted nanomaterials in the bottom of the oil layer. Credit: Michigan Tech, Sarah Bird

Purifying water and greening nanotechnology could be as simple as shaking a vial of water and oil. At least that's the case for a new method to clean contaminated water full of unwanted nanomaterials.

Nano implies small—and that's great for use in , beauty products and smartphones—but it's also a problem. The tiny nanoparticles, nanowires, nanotubes and other nanomaterials that make up our technology eventually find their way into water. The Environmental Protection Agency says more 1,300 commercial products use some kind of nanomaterial. And we just don't know the full impact on health and the environment.

"These materials are very, very tiny and that means if you try to remove them and clean them out of , that it's quite difficult," says Dongyan Zhang, a research scientist at Michigan Technological University. She adds that techniques like filter paper or meshes often don't work.

Instead, shaking up oil and water traps the nanomaterials, which can be easily removed. The process clears out nearly 100 percent of nanowires, nanosheets, nanotubes and other one- and two-dimensional nanomaterials. Only zero-dimensional nanospheres are still too small to grab.

The study came out recently in the American Chemical Society's journal Applied Materials and Interfaces.

Nano implies small -- and that's great for use in medical devices, beauty products and smartphones -- but it's also a problem. All these tiny particles get into our water and are difficult to remove. Now, researchers Yoke Khin Yap and Dongyang Zhang have a novel and very simple way to take the nanomaterials out. Credit: Michigan Tech, Sarah Bird
Shaking the nanomaterials out
Physics researchers Yoke Khin Yap (not pictured), Dongyan Zhang and Bishnu Tiwari have come up with a simple way to remove nanomaterials from contaminated water. Just shake them out. Credit: Michigan Tech, Sarah Bird

Explore further

Polymerization of carbon cage structures to linear diamond-like structures inside carbon nanotubes

More information: Bishnu Tiwari et al. A Simple and Universal Technique To Extract One- and Two-Dimensional Nanomaterials from Contaminated Water, ACS Applied Materials & Interfaces (2015). DOI: 10.1021/acsami.5b07542
Citation: Shaking the nanomaterials out: New method to purify contaminated water (2015, December 10) retrieved 19 July 2019 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Feedback to editors

User comments

Dec 10, 2015
exactly what homeopathy is. https://en.wikipe...ilutions
Water memory

Dec 10, 2015
exactly what homeopathy is. https://en.wikipe...ilutions
Water memory

homeopathy is pseudoscience, as noted in your own link
The idea is pseudoscience, because at commonly used dilutions, no molecules of the original material are likely to remain.

Dec 10, 2015
How would this work to separate out viruses?

Homeopathy is pseudoscience until its proven, i.e., aspirin; however, it still worked before it was proven.
Several paths have been proven. More need to be proven and understood.

Dec 11, 2015
Homeopathy is pseudoscience until its proven, i.e., aspirin
you are confusing homeopathy with naturopathy. there is a difference

for a headache, a naturopath would chew or eat willow bark, which contains salicylic acid (or would take feverfew, which is Tanacetum parthenium Schulz-Bip. Family: Asteraceae (daisies) )

however, a homeopath would use something that causes headache's in healthy people to cure headache's in sick people while diluting the product so many times it would be essentially the same as taking a drink of water sans medication

that is why it is considered pseudoscience

i know this because my wife is a nurse and naturopath and studies it regularly

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more