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Plasma treated activated carbon impregnated with silver nanoparticles for improved antibacterial effect in water disinfection

DSpace at IIT Bombay

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Title Plasma treated activated carbon impregnated with silver nanoparticles for improved antibacterial effect in water disinfection
 
Creator SRINIVASAN, NR
SHANKAR, PA
BANDYOPADHYAYA, R
 
Subject TITANIUM-DIOXIDE NANOPARTICLES
SURFACE GROUPS
NANOMATERIALS
ADSORPTION
TOXICITY
FIBERS
OXYGEN
AG
 
Description A strategy to selectively attach more Ag nanoparticles on the external surface of activated carbon (AC) is being proposed and used as an antibacterial medium for water disinfection. Ag nanoparticles were first synthesized under UV irradiation by reducing silver nitrate with sodium citrate; the latter serving the dual purpose of both a reducing and a capping agent. Transmission electron micrographs show that Ag particles have a mean diameter of 28 nm with a standard deviation of 5 nm. The AC was treated by an oxygen plasma to increase the number of polar functional groups on the surface. This carbon-surface modification treatment increased the number of Ag nanoparticles on the external surface of AC, compared to that inside pores. Fourier transform infra-red and X-ray photoelectron spectroscopy results show that the oxygen plasma treatment leads to an increase in oxygen-containing-functional groups, such as C-O and C=O, from 21.9% to 30.8%. Microbiological investigations by plate assay and shake flask tests confirmed the antibacterial nature of the AC-Ag hybrid, showing an order of magnitude increase in death rate constant from 3.72 to 41.88 h(-1) on plasma treatment (rate constant means rate of loss of viable cell). (c) 2013 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-10-14T17:33:26Z
2014-10-14T17:33:26Z
2013
 
Type Article
 
Identifier CARBON, 571-10
http://dx.doi.org/10.1016/j.carbon.2013.01.008
http://dspace.library.iitb.ac.in/jspui/handle/100/14578
 
Language en