Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Nanocellulose Sponges to Combat Oil Pollution

07.05.2014

Miracle cure made from plants and recycled paper

All industrial nations need large volumes of oil which is normally delivered by ocean-going tankers or via inland waterways to its destination.

The most environmentally-friendly way of cleaning up nature after an oil spill accident is to absorb and recover the floating film of oil. The Empa researchers Tanja Zimmermann and Philippe Tingaut, in collaboration with Gilles Sèbe from the University of Bordeaux, have now succeeded in developing a highly absorbent material which separates the oil film from the water and can then be easily recovered, “silylated” nanocellulose sponge.

In laboratory tests the sponges absorbed up to 50 times their own weight of mineral oil or engine oil. They kept their shape to such an extent that they could be removed with pincers from the water. The next step is to fine tune the sponges so that they can be used not only on a laboratory scale but also in real disasters. To this end, a partner from the industry is currently sought.

One step production – from cellulose plants

Nanofibrillated Cellulose (NFC), the basic material for the sponges, is extracted from cellulose-containing materials like wood pulp, agricultural by products (such as straw) or waste materials (such as recycled paper) by adding water to them and pressing the aqueous pulp through several narrow nozzles at high pressure. This produces a suspension with gel-like properties containing long and interconnected cellulose nanofibres.

When the water from the gel is replaced with air by freeze-drying, a nanocellulose sponge is formed which absorbs both water and oil. This pristine material sinks in water and is thus nott useful for the envisaged purpose.

The Empa researchers have succeeded in modifying the chemical properties of the nanocellulose in just one process step by admixing a reactive alkoxysilane moleculein the gel before freeze-drying. The nanocellulose sponge loses its hydrophilic properties, is no longer suffused with water and only binds with oily substances.

In the laboratory the “silylated” nanocellulose sponge absorbed test substances like engine oil, silicone oil, ethanol, acetone or chloroform within seconds. Nanofibrillated cellulose sponge, therefore, reconciles several desirable properties: it is absorbent, floats reliably on water even when fully saturated and is biodegradable.

Download images at https://flic.kr/s/aHsjX9EZTh

Dr. Philippe Tingaut, Wood, phone +41 58 765 4749, Philippe.Tingaut@empa.ch
Dr. Tanja Zimmermann, Wood, phone +41 58 765 4115, Tanja.Zimmermann@empa.ch

Rainer Klose | newswise
Further information:
http://www.empa.ch

More articles from Life Sciences:

nachricht Researchers study vital 'on/off switches' that control when bacteria turn deadly
19.09.2014 | University of Wisconsin-Madison

nachricht The link between circadian clock and stress
19.09.2014 | Julius-Maximilians-Universität Würzburg

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Anzeige

Anzeige

Event News

"Start-ups and spin-offs funding – Public and private policies", 14th October 2014

12.09.2014 | Event News

BALTIC 2014: Baltic Sea Geologists meet in Warnemünde

03.09.2014 | Event News

IT security in the digital society

27.08.2014 | Event News

 
Latest News

The link between circadian clock and stress

19.09.2014 | Life Sciences

Researchers study vital 'on/off switches' that control when bacteria turn deadly

19.09.2014 | Life Sciences

Monster galaxies gain weight by eating smaller neighbours

19.09.2014 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>