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Title: Preventing maritime transport of pathogens: The remarkable antimicrobial properties of silver-supported catalysts for ship ballast water disinfection
Authors: Theologides, Christodoulos P. 
Theofilou, S. P. 
Anayiotos, Andreas 
Costa, Costas 
Keywords: Silver;Catalytic disinfection;Ballast water;Bacteria
Category: Environmental Engineering
Field: Engineering and Technology
Issue Date: 1-Jul-2017
Source: WATER SCIENCE AND TECHNOLOGY, Volume: 76, Issue: 3, Pages: 712-718, Published: JUL 2017
Journal: Water Science and Technology
Abstract: Ship ballast water (SBW) antimicrobial treatment is considered as a priority issue for the shipping industry. The present work investigates the possibility of utilizing antimicrobial catalysis as an effective method for the treatment of SBW. Taking into account the well-known antimicrobial properties of ionic silver (Ag+), five silver-supported catalysts (Ag/gamma-Al2O3) with various loadings (0.05, 0.1, 0.2, 0.5, and 1 wt%) were prepared and examined for the antimicrobial treatment of SBW. The bactericidal activity of the aforementioned catalysts was investigated towards the inhibition of Escherichia coli (Gram-negative) and Escherichia faecalis (Gram-positive) bacteria. Catalytic experiments were conducted in a three-phase continuous flow stirred tank reactor, used in a semi-batch mode. It was found that using the catalyst with the lowest metal loading, the inhibition of E. coli reached 95.8% after 30 minutes of treatment of an E. coli bacterial solution, while the inhibition obtained for E. faecalis was 76.2% after 60 minutes of treatment of an E. faecalis bacterial solution. Even better results (100% inhibition after 5 min of reaction) were obtained using the catalysts with higher Ag loadings. The results of the present work indicate that the prepared monometallic catalysts exert their antimicrobial activity within a short period of time, revealing, for the first time ever, that the field of antimicrobial heterogeneous catalysis using deposited ionic silver on a solid support may prove decisive for the disinfection of SBW.
ISSN: 0273-1223
Rights: © IWA Publishing 2017
Type: Article
Appears in Collections:Άρθρα/Articles

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