Antibacterial activities of mechanochemically synthesized perovskite strontium titanate ferrite metal oxide

Li Zhang; Pei Yun Tan; Chee Lap Chow; Chiew Keat Lim; Ooi Kiang Tan; Man Siu Tse; Chun Chau Sze

doi:10.1016/j.colsurfa.2014.05.032

Antibacterial activities of mechanochemically synthesized perovskite strontium titanate ferrite metal oxide

Li Zhang^*, Pei Yun Tan, Chee Lap Chow, Chiew Keat Lim, Ooi Kiang Tan, Man Siu Tse, Chun Chau Sze

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

35 Citations (Scopus)

Abstract

This work explored strontium titanate ferrite (SrTi_1-xFe_xO_3-δ or STF_x in short) metal oxide as an effective antibacterial agent and investigated its bactericidal mechanism. The perovskite STF_x nanoparticles (x=0, 0.2, 0.4, 0.6, 0.8 and 1) were successfully synthesized with high energy ball milling approach. The feasibility of utilizing this material for antibacterial application was studied on Escherichia coli (E. coli) in the presence of dispersed STF_0.8 nanoparticles in water. Excellent bactericidal effect has been observed by killing all the E. coli (~10⁵CFU/mL) within 15min in both light and dark conditions, excluding photocatalysis as the major contributing mean of bactericidal effect. Mechanism study via surface charge characterization, fluorescence microscope observation, inductively coupled plasma measurement and SEM examination has revealed that the positive surface charge, high pH environment, Sr²⁺ dissociation and nano-size of STF_0.8 metal oxide could have collectively contributed to its excellent bactericidal effect. These results have increased the potential to apply STF_x in water purification for microorganism destruction.

Original language	English
Pages (from-to)	169-175
Number of pages	7
Journal	Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume	456
Issue number	1
DOIs	https://doi.org/10.1016/j.colsurfa.2014.05.032
Publication status	Published - Aug 20 2014
Externally published	Yes

ASJC Scopus Subject Areas

Surfaces and Interfaces
Physical and Theoretical Chemistry
Colloid and Surface Chemistry

Keywords

Antibacterial
Mechanism
Metal oxide-bacteria interaction
Photocatalysis
Strontium titanate ferrite

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10.1016/j.colsurfa.2014.05.032

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title = "Antibacterial activities of mechanochemically synthesized perovskite strontium titanate ferrite metal oxide",

abstract = "This work explored strontium titanate ferrite (SrTi1-xFexO3-δ or STFx in short) metal oxide as an effective antibacterial agent and investigated its bactericidal mechanism. The perovskite STFx nanoparticles (x=0, 0.2, 0.4, 0.6, 0.8 and 1) were successfully synthesized with high energy ball milling approach. The feasibility of utilizing this material for antibacterial application was studied on Escherichia coli (E. coli) in the presence of dispersed STF0.8 nanoparticles in water. Excellent bactericidal effect has been observed by killing all the E. coli (~105CFU/mL) within 15min in both light and dark conditions, excluding photocatalysis as the major contributing mean of bactericidal effect. Mechanism study via surface charge characterization, fluorescence microscope observation, inductively coupled plasma measurement and SEM examination has revealed that the positive surface charge, high pH environment, Sr2+ dissociation and nano-size of STF0.8 metal oxide could have collectively contributed to its excellent bactericidal effect. These results have increased the potential to apply STFx in water purification for microorganism destruction.",

keywords = "Antibacterial, Mechanism, Metal oxide-bacteria interaction, Photocatalysis, Strontium titanate ferrite",

author = "Li Zhang and Tan, {Pei Yun} and Chow, {Chee Lap} and Lim, {Chiew Keat} and Tan, {Ooi Kiang} and Tse, {Man Siu} and Sze, {Chun Chau}",

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AU - Zhang, Li

AU - Tan, Pei Yun

AU - Chow, Chee Lap

AU - Lim, Chiew Keat

AU - Tan, Ooi Kiang

AU - Tse, Man Siu

AU - Sze, Chun Chau

PY - 2014/8/20

Y1 - 2014/8/20

N2 - This work explored strontium titanate ferrite (SrTi1-xFexO3-δ or STFx in short) metal oxide as an effective antibacterial agent and investigated its bactericidal mechanism. The perovskite STFx nanoparticles (x=0, 0.2, 0.4, 0.6, 0.8 and 1) were successfully synthesized with high energy ball milling approach. The feasibility of utilizing this material for antibacterial application was studied on Escherichia coli (E. coli) in the presence of dispersed STF0.8 nanoparticles in water. Excellent bactericidal effect has been observed by killing all the E. coli (~105CFU/mL) within 15min in both light and dark conditions, excluding photocatalysis as the major contributing mean of bactericidal effect. Mechanism study via surface charge characterization, fluorescence microscope observation, inductively coupled plasma measurement and SEM examination has revealed that the positive surface charge, high pH environment, Sr2+ dissociation and nano-size of STF0.8 metal oxide could have collectively contributed to its excellent bactericidal effect. These results have increased the potential to apply STFx in water purification for microorganism destruction.

AB - This work explored strontium titanate ferrite (SrTi1-xFexO3-δ or STFx in short) metal oxide as an effective antibacterial agent and investigated its bactericidal mechanism. The perovskite STFx nanoparticles (x=0, 0.2, 0.4, 0.6, 0.8 and 1) were successfully synthesized with high energy ball milling approach. The feasibility of utilizing this material for antibacterial application was studied on Escherichia coli (E. coli) in the presence of dispersed STF0.8 nanoparticles in water. Excellent bactericidal effect has been observed by killing all the E. coli (~105CFU/mL) within 15min in both light and dark conditions, excluding photocatalysis as the major contributing mean of bactericidal effect. Mechanism study via surface charge characterization, fluorescence microscope observation, inductively coupled plasma measurement and SEM examination has revealed that the positive surface charge, high pH environment, Sr2+ dissociation and nano-size of STF0.8 metal oxide could have collectively contributed to its excellent bactericidal effect. These results have increased the potential to apply STFx in water purification for microorganism destruction.

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KW - Photocatalysis

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Antibacterial activities of mechanochemically synthesized perovskite strontium titanate ferrite metal oxide

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Keywords

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