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Enhancement of antibacterial efficiency at silver electrodeposited on coconut shell activated carbon by modulating pulse frequency

Enhancement of antibacterial efficiency at silver electrodeposited on coconut shell activated carbon by modulating pulse frequency
Enhancement of antibacterial efficiency at silver electrodeposited on coconut shell activated carbon by modulating pulse frequency
The natural antibacterial activity of silver represents an alternative to deal with the ever increasing pathogenic breakouts related with contaminated water resources. In this study, silver was deposited on the surface of activated carbon (AC) particles via pulsed electrodeposition (PED) employing an electrochemical reactor operating at fixed and fluidized bed regimes. Silver-coated activated carbon (Ag/AC) particles were prepared at different current pulse frequency values. Antimicrobial properties of the produced material were tested against two well-known foodborne pathogens, i.e., Escherichia coli O157:H7 and Salmonella typhimurium. The results demonstrate a strong influence of the applied current pulse frequency on both the bactericidal efficiency and the specific surface of silver deposited on the activated carbon. Antibacterial results demonstrate up to eight orders of magnitude decrease in the CFU cm−3 (colony-forming units per cm3) against both microorganisms in just 20 min contact time. Additional chronoamperometry transient data were fitted to the Scharifker-Hills nucleation model for the electrodeposition of silver at a rotating disk electrode, revealing an instantaneous nucleation growth processes. The Ag/AC particles were characterized by field emission scanning electron microscopy (FE-SEM), specific surface area (SBET), Raman spectroscopy, energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), demonstrating the existence of crystalline phase formation of a preferential (200) plane growth with silver and silver oxide being present.
Fluidized bed Packed bed Pulsed electrodeposition, Salmonella typhimurium Scharifker-Hills model
1432-8488
Ortiz-Ibarra, Hector
4ece9987-a0c0-4e3f-be68-39f13203818e
Torres-Vitela, Refugio
972dba3e-2976-4baf-b1d1-3e97ca517f44
Gomez-Salazar, Sergio
b2c8160f-8b26-4db9-ba90-60bc6a03e0ef
Casillas, Norberto
39ced5c0-db14-4439-9615-07627a385252
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2
Ortiz-Ibarra, Hector
4ece9987-a0c0-4e3f-be68-39f13203818e
Torres-Vitela, Refugio
972dba3e-2976-4baf-b1d1-3e97ca517f44
Gomez-Salazar, Sergio
b2c8160f-8b26-4db9-ba90-60bc6a03e0ef
Casillas, Norberto
39ced5c0-db14-4439-9615-07627a385252
Ponce De Leon Albarran, Carlos
508a312e-75ff-4bcb-9151-dacc424d755c
Walsh, Frank C.
309528e7-062e-439b-af40-9309bc91efb2

Ortiz-Ibarra, Hector, Torres-Vitela, Refugio, Gomez-Salazar, Sergio, Casillas, Norberto, Ponce De Leon Albarran, Carlos and Walsh, Frank C. (2017) Enhancement of antibacterial efficiency at silver electrodeposited on coconut shell activated carbon by modulating pulse frequency. Journal of Solid State Electrochemistry. (doi:10.1007/s10008-017-3795-9).

Record type: Article

Abstract

The natural antibacterial activity of silver represents an alternative to deal with the ever increasing pathogenic breakouts related with contaminated water resources. In this study, silver was deposited on the surface of activated carbon (AC) particles via pulsed electrodeposition (PED) employing an electrochemical reactor operating at fixed and fluidized bed regimes. Silver-coated activated carbon (Ag/AC) particles were prepared at different current pulse frequency values. Antimicrobial properties of the produced material were tested against two well-known foodborne pathogens, i.e., Escherichia coli O157:H7 and Salmonella typhimurium. The results demonstrate a strong influence of the applied current pulse frequency on both the bactericidal efficiency and the specific surface of silver deposited on the activated carbon. Antibacterial results demonstrate up to eight orders of magnitude decrease in the CFU cm−3 (colony-forming units per cm3) against both microorganisms in just 20 min contact time. Additional chronoamperometry transient data were fitted to the Scharifker-Hills nucleation model for the electrodeposition of silver at a rotating disk electrode, revealing an instantaneous nucleation growth processes. The Ag/AC particles were characterized by field emission scanning electron microscopy (FE-SEM), specific surface area (SBET), Raman spectroscopy, energy dispersive X-ray spectroscopy (EDS), and X-ray diffraction (XRD), demonstrating the existence of crystalline phase formation of a preferential (200) plane growth with silver and silver oxide being present.

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More information

Accepted/In Press date: 4 October 2017
e-pub ahead of print date: 23 October 2017
Keywords: Fluidized bed Packed bed Pulsed electrodeposition, Salmonella typhimurium Scharifker-Hills model

Identifiers

Local EPrints ID: 417298
URI: http://eprints.soton.ac.uk/id/eprint/417298
ISSN: 1432-8488
PURE UUID: efc33418-13ee-4ffb-a7bd-978ecf95080f
ORCID for Carlos Ponce De Leon Albarran: ORCID iD orcid.org/0000-0002-1907-5913

Catalogue record

Date deposited: 29 Jan 2018 17:30
Last modified: 07 Oct 2020 01:51

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