Featured Research

from universities, journals, and other organizations

Carbon nanotube sponge shows improved water clean-up

Date:
January 17, 2014
Source:
Institute of Physics
Summary:
A new carbon nanotube sponge capable of soaking up water contaminants, such as fertilizers, pesticides and pharmaceuticals, is more than three times more efficiently than previous efforts.

A carbon nanotube sponge capable of soaking up water contaminants, such as fertilisers, pesticides and pharmaceuticals, more than three times more efficiently than previous efforts has been presented in a new study published today.

Related Articles


The carbon nanotube (CNT) sponges, uniquely doped with sulphur, also demonstrated a high capacity to absorb oil, potentially opening up the possibility of using the material in industrial accidents and oil spill clean-ups.

The results have been published today, 17 January, in IOP Publishing's journal Nanotechnology.

CNTs are hollow cylindrical structures composed of a single sheet of carbon. Owing to their structure, CNTs have extraordinary thermal, chemical and mechanical properties that have led to an array of applications from body armour to solar panels.

They have been touted as excellent candidates for wastewater clean-up; however, problems have arisen when trying to handle the fine powders and eventually retrieve them from the water.

Lead author of the research Luca Camilli, from the University of Roma, said: "It is quite tricky using CNT powders to remove oil spilled in the ocean. They are hard to handle and can eventually get lost or dispersed in the ocean after they are released.

"However, millimetre- or centimetre-scale CNTs, as we've synthesised in this study, are much easier to handle. They float on water because of their porous structure and, once saturated with oil, can be easily removed. By simply squeezing them and releasing the oil, they can then be re-used."

In the new study, the researchers, from the University of Roma, University of Nantes and University of L'Aquila, bulked up the CNTs to the necessary size by adding sulphur during the production process―the resulting sponge had an average length of 20 mm.

The addition of sulphur caused defects to form on the surface of the CNT sponges which then enabled ferrocene, which was also added during the production process, to deposit iron into tiny capsules within the carbon shells.

The presence of iron meant the sponges could be magnetically controlled and driven without any direct contact, easing the existing problem of trying to control CNTs when added onto the water's surface.

The researchers demonstrated how the constructed CNT sponges could successfully remove a toxic organic solvent―dichlorobenzene―from water, showing that it could absorb a mass that was 3.5 times higher than previously achieved.

The CNT sponges were also shown to absorb vegetable oil up to 150 times of its initial weight and absorb engine oil to a slightly higher capacity than previous reported.

"The improved absorption properties of the sponge are down to the porous structure and the rough surface of the CNTs. Oils or solvent can easily be absorbed in the empty spaces amongst the CNTs, which is made easier by the rough surfaces," continued Camilli.

"The next stage of our research is to improve the synthesis process so that the sponges can be produced on a commercial scale. We must also study the toxicity of the sponges before any real-world applications can be realised."


Story Source:

The above story is based on materials provided by Institute of Physics. Note: Materials may be edited for content and length.


Journal Reference:

  1. L Camilli, C Pisani, E Gautron, M Scarselli, P Castrucci, F D’Orazio, M Passacantando, D Moscone, M De Crescenzi. A three-dimensional carbon nanotube network for water treatment. Nanotechnology, 2014; 25 (6): 065701 DOI: 10.1088/0957-4484/25/6/065701

Cite This Page:

Institute of Physics. "Carbon nanotube sponge shows improved water clean-up." ScienceDaily. ScienceDaily, 17 January 2014. <www.sciencedaily.com/releases/2014/01/140117090615.htm>.
Institute of Physics. (2014, January 17). Carbon nanotube sponge shows improved water clean-up. ScienceDaily. Retrieved March 6, 2015 from www.sciencedaily.com/releases/2014/01/140117090615.htm
Institute of Physics. "Carbon nanotube sponge shows improved water clean-up." ScienceDaily. www.sciencedaily.com/releases/2014/01/140117090615.htm (accessed March 6, 2015).

Share This


More From ScienceDaily



More Earth & Climate News

Friday, March 6, 2015

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Late Winter Storm Wreaks Havoc Across Eastern US

Late Winter Storm Wreaks Havoc Across Eastern US

AP (Mar. 5, 2015) — A strong cold front moving across the eastern U.S. has dumped deep snow in some regions, creating hazardous conditions from Kentucky to New England. (March 5) Video provided by AP
Powered by NewsLook.com
Keurig Co-Founder Says Company Has A Waste Problem

Keurig Co-Founder Says Company Has A Waste Problem

Newsy (Mar. 5, 2015) — Keurig co-founder John Sylvan told The Atlantic he doesn&apos;t even own a Keurig because they&apos;re too expensive and produce too much waste. Video provided by Newsy
Powered by NewsLook.com
Raw: Tourists Visit Rare Grey Whales in Mexico

Raw: Tourists Visit Rare Grey Whales in Mexico

AP (Mar. 4, 2015) — Once nearly extinct, grey whales now migrate in their thousands to Mexico&apos;s Vizcaino reserve in Baja California, in search of warmer waters to mate and give birth. Tourists flock to the reserve to see the whales, measuring up to 49 feet long. (March 4) Video provided by AP
Powered by NewsLook.com
Raw: Injured Miners Treated After Blast

Raw: Injured Miners Treated After Blast

AP (Mar. 4, 2015) — An explosion ripped through a coal mine before dawn Wednesday in war-torn eastern Ukraine, killing at least one miner, officials said. Graphic video of injured miners being treated in a Donetsk hospital. (March 4) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
 
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:  

Breaking News:

Strange & Offbeat Stories

 

Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:  

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile iPhone Android Web
Follow Facebook Twitter Google+
Subscribe RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins