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Chloride ion-driven transformation from Ag3PO4 to AgCl on the hydroxyapatite support and its dual antibacterial effect against Escherichia coli under visible light irradiation

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Abstract

Visible light-driven photocatalytic inactivation of Escherichia coli was performed using hydroxyapatite-supported Ag3PO4 nanocomposites (Ag3PO4/HA). The antibacterial performance was evaluated by the methods of zone of inhibition plates and minimum inhibitory concentration test. X-ray diffraction (XRD) and transmission electron microscopy (TEM) were employed to investigate the instability and transformation of the nanocomposite by comparing the crystalline, phase, and the morphology before and after exposure to Luria-Bertani culture medium under visible light irradiation. Ag3PO4 nanoparticles on the support were found to be shortly transformed into AgCl due to high chloride concentration of Luria-Bertani culture medium. The AgCl/HA nanocomposite showed both excellent intrinsic antibacterial performance contributed by the released silver ions and visible light-induced photocatalytic disinfection toward E. coli cells. This dual antibacterial function mechanism was validated by trapping the hydroxyl free radical and detecting the silver ions during the photocatalytic antibacterial process. The morphological change of E. coli cells in different reaction intervals was obtained by scanning electron microscopy (SEM) to complementally verify photocatalytic inactivation of E. coli. This work suggests that an essential comparison study is required for the antibacterial materials before and after the photocatalytic inactivation of bacterial cells using Ag3PO4 nanoparticles or Ag3PO4-related nanocomposites in mediums containing high-concentration chloride ions.

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Acknowledgments

Financial support for this work was provided by the National Nature Science Foundation of China (21203067), International Science and Technology Cooperation Program of China (2014DFE90040), and Zhejiang Province Science and Technology Innovation Team (2013TD12).

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Authors and Affiliations

  1. Research Institute of Eco-environmental Science, School of Civil Engineering and Architecture, Zhejiang University of Science and Technology, Hangzhou, 310023, China

    Xiaoting Hong, Shengdao Shan, Mingyue Mo & Xiaoli Yuan

  2. School of Chemistry and Environment, South China Normal University, Guangzhou, 510006, China

    Min Li

  3. Department of Mechanical Convergence Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul, 133-791, Republic of Korea

    K. S. Hui

Authors
  1. Xiaoting Hong
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  2. Min Li
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  3. Shengdao Shan
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  4. K. S. Hui
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  5. Mingyue Mo
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  6. Xiaoli Yuan
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Correspondence to Xiaoting Hong or Mingyue Mo.

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Responsible editor: Philippe Garrigues

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Hong, X., Li, M., Shan, S. et al. Chloride ion-driven transformation from Ag3PO4 to AgCl on the hydroxyapatite support and its dual antibacterial effect against Escherichia coli under visible light irradiation. Environ Sci Pollut Res 23, 13458–13466 (2016). https://doi.org/10.1007/s11356-016-6530-7

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  • DOI: https://doi.org/10.1007/s11356-016-6530-7

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