Featured Research

from universities, journals, and other organizations

'Greener' aerogel technology holds potential for oil and chemical clean-up

Date:
February 25, 2014
Source:
University of Wisconsin-Madison
Summary:
A group of researchers is examining alternative materials that can be modified to absorb oil and chemicals without absorbing water. If further developed, the technology may offer a cheaper and 'greener' method to absorb oil and heavy metals from water and other surfaces.

Zheng uses tweezers to hold a sample of the aerogel that has been used to absorb red-dyed diesel fuel (right), while Gong holds a sample of unused aerogel (left).
Credit: Bryce Richter/University of Wisconsin Madison

Cleaning up oil spills and metal contaminates in a low-impact, sustainable and inexpensive manner remains a challenge for companies and governments globally.

But a group of researchers at the University of Wisconsin-Madison is examining alternative materials that can be modified to absorb oil and chemicals without absorbing water. If further developed, the technology may offer a cheaper and "greener" method to absorb oil and heavy metals from water and other surfaces.

Shaoqin "Sarah" Gong, a researcher at the Wisconsin Institute for Discovery (WID) and associate professor of biomedical engineering, graduate student Qifeng Zheng, and Zhiyong Cai, a project leader at the USDA Forest Products Laboratory in Madison, have recently created and patented the new aerogel technology.

Aerogels, which are highly porous materials and the lightest solids in existence, are already used in a variety of applications, ranging from insulation and aerospace materials to thickening agents in paints. The aerogel prepared in Gong's lab is made of cellulose nanofibrils (sustainable wood-based materials) and an environmentally friendly polymer. Furthermore, these cellulose-based aerogels are made using an environmentally friendly freeze-drying process without the use of organic solvents.

It's the combination of this "greener" material and its high performance that got Gong's attention.

"For this material, one unique property is that it has superior absorbing ability for organic solvents -- up to nearly 100 times its own weight," she says. "It also has strong absorbing ability for metal ions."

Treating the cellulose-based aerogel with specific types of silane after it is made through the freeze-drying process is a key step that gives the aerogel its water-repelling and oil-absorbing properties.

"So if you had an oil spill, for example, the idea is you could throw this aerogel sheet in the water and it would start to absorb the oil very quickly and efficiently," she says. "Once it's fully saturated, you can take it out and squeeze out all the oil. Although its absorbing capacity reduces after each use, it can be reused for a couple of cycles."

In addition, this cellulose-based aerogel exhibits excellent flexibility as demonstrated by compression mechanical testing.

Though much work needs to be done before the aerogel can be mass-produced, Gong says she's eager to share the technology's potential benefits beyond the scientific community.

"We are living in a time where pollution is a serious problem -- especially for human health and for animals in the ocean," she says. "We are passionate to develop technology to make a positive societal impact."

Gong and her colleagues have featured their findings in the Journal of Materials Chemistry A.

A video demonstration of the aerogel can be viewed at https://vimeo.com/83866048


Story Source:

The above story is based on materials provided by University of Wisconsin-Madison. Note: Materials may be edited for content and length.


Journal Reference:

  1. Qifeng Zheng, Zhiyong Cai, Shaoqin Gong. Green synthesis of polyvinyl alcohol (PVA)–cellulose nanofibril (CNF) hybrid aerogels and their use as superabsorbents. Journal of Materials Chemistry A, 2014; 2 (9): 3110 DOI: 10.1039/C3TA14642A

Cite This Page:

University of Wisconsin-Madison. "'Greener' aerogel technology holds potential for oil and chemical clean-up." ScienceDaily. ScienceDaily, 25 February 2014. <www.sciencedaily.com/releases/2014/02/140225112938.htm>.
University of Wisconsin-Madison. (2014, February 25). 'Greener' aerogel technology holds potential for oil and chemical clean-up. ScienceDaily. Retrieved September 17, 2014 from www.sciencedaily.com/releases/2014/02/140225112938.htm
University of Wisconsin-Madison. "'Greener' aerogel technology holds potential for oil and chemical clean-up." ScienceDaily. www.sciencedaily.com/releases/2014/02/140225112938.htm (accessed September 17, 2014).

Share This



More Earth & Climate News

Wednesday, September 17, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Raw: Scientists Examine Colossal Squid

Raw: Scientists Examine Colossal Squid

AP (Sep. 16, 2014) Squid experts in New Zealand thawed and examined an unusual catch on Tuesday: a colossal squid. It was captured in Antarctica's remote Ross Sea in December last year and has been frozen for eight months. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Researchers Explore Shipwrecks Off Calif. Coast

Researchers Explore Shipwrecks Off Calif. Coast

AP (Sep. 16, 2014) Federal researchers are exploring more than a dozen underwater sites where they believe ships sank in the treacherous waters west of San Francisco in the decades following the Gold Rush. (Sept. 16) Video provided by AP
Powered by NewsLook.com
Isolated N. Korea Asks For International Help With Volcano

Isolated N. Korea Asks For International Help With Volcano

Newsy (Sep. 16, 2014) Mount Paektu volcano in North Korea is showing signs of life and there's not much known about it. Video provided by Newsy
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:
from the past week

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