Navigation Links
Exposing ZnO nanorods to visible light removes microbes
Date:5/12/2011

The practical use of visible light and zinc oxide nanorods for destroying bacterial water contamination has been successfully demonstrated by researchers at the Asian Institute of Technology (AIT). Nanorods grown on glass substrates and activated by solar energy have been found to be effective in killing both gram positive and gram negative bacteria a finding that has immense possibilities for affordable and environmentally friendly water purification techniques.

"Most studies so far either work on the use of ultraviolet light or involve a suspension of nanoparticles," revealed Prof. Joydeep Dutta, director of the Center for Excellence in Nanotechnology at AIT. The AIT research group has dispensed with both. Instead of using a suspension of nanoparticles, which have to be removed later after the water purification process, or relying on UV light, the group demonstrated a system featuring visible light and ZnO nanorods. "The key concept was to incorporate deliberate defects in ZnO nanorods by creating oxygen vacancies and interstitials, which then allows visible light absorption," he explained.

Environmentally friendly approach

Such ZnO nanorods grown on glass were tested on Escherichia coli and Bacillus subtilis bacteria, which are commonly used as model microbes. In the dark, ZnO dissolves slowly releasing zinc ions, which have anti bacterial properties, as it penetrates the bacterial cell envelope thereby thwarting the growth of microbes. Under well lit conditions, the effect is doubled with both photocatalysis and zinc ions playing their part in killing the microbes.

The implications of these experiments are enormous. "Since ZnO has now been tested under solar light, instead of the traditionally used UV light, the potential for commercial applications is huge, particularly since the levels of zinc ions removed from the rods to the water are safe for human consumption," added Dutta.

The team, which also includes Dr. Oleg V Shipin, Ajaya Sapkota, Dr. Alfredo J Anceno, Mr. Sunandan Baruah and Ms. Mayuree Jaisai, is continuing its work on photocatalysis for use in water decontamination.


'/>"/>

Contact: Prof. Joydeep Dutta
nano@ait.ac.th
Asian Institute of Technology
Source:Eurekalert

Related biology technology :

1. Nanorods developed in UC Riverside lab could greatly improve visual display of information
2. Slimmer, stickier nanorods give boost to 3-D computer chips
3. Purifying nanorods: Big success with tiny cleanup
4. Zare and Fisher Win the BBVA Foundation Frontiers of Knowledge Award in Basic Sciences for Rendering Molecules Visible and Analyzing Their Collective Behavior
5. Popular Science Awards Lyric “Invisible” Hearing Aid 2009 “Best of What's New” Award
6. Not all titanium dioxide is equal when it comes to splitting water with visible light
7. New screening techniques, treatments shed light on gastrointestinal disorders in children
8. Auxilium Pharmaceuticals, Inc. Announces First Quarter 2011 Financial Results and Operational Highlights
9. Caliper Owners Group and Investor Meeting to Highlight Technologies Enabling Personalized Medicine
10. Verenium to Present at MDB Capital Groups Bright Lights Conference
11. InterMune Reports First Quarter 2011 Financial Results and Business Highlights
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/9/2016)... , February 9, 2016 Three-Year ... Enables Children to Take Part in Life-Changing Camp ... new initiative designed to positively affect the lives of children born ... care. --> SHPG ) is announcing a new initiative ... diseases, as well as the future of rare disease care. ...
(Date:2/9/2016)... , Feb. 9, 2016 ... Inhibitors-Pipeline Insights, 2016", report provides in depth ... development activities around the Protein-Tyrosine Phosphatase 1B ... product profiles in various stages of development ... II, Phase III and Preregistration. Report covers ...
(Date:2/8/2016)... Pa. , Feb. 8, 2016 Should ... standard bone cement products to prevent infection after standard ... that the experts at ECRI Institute have been fielding ... Infection or Fighting Your Bottom Line?" ... Your Bottom Line?" --> While ...
(Date:2/8/2016)... , February 8, 2016 ... Private Limited, an innovation-driven oncology company developing next ... less toxic, today announced that chairman emeritus of ... invested in the company as part of the ... joining existing investors Navam Capital and Aarin Capital. ...
Breaking Biology Technology:
(Date:2/2/2016)... --Technology Enhancements Accelerate Growth of X-ray Imaging This ... computed radiography markets in Thailand , ... (TIM). It provides an in-depth analysis of ... regional market drivers and restraints. The study offers revenue ... attractiveness, both for digital and computed radiography. Market participants ...
(Date:2/1/2016)... smart wallet ( www.wocketwallet.com ) announces the launch of a new video ... Las Vegas , where Joey appeared at the Wocket ... Vegas , where Joey appeared at the Wocket booth to meet ... filmed at the Consumer Electronics Show (CES2016) in Las Vegas ... greet fans. --> --> The ...
(Date:1/22/2016)... DUBLIN , January 22, 2016 ... has announced the addition of the  ... to their offering. --> ... of the  "Global Behavioral Biometric Market ... --> Research and Markets ( http://www.researchandmarkets.com/research/4lmf2s/global_behavioral ...
Breaking Biology News(10 mins):