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Antibacterial and photocatalytic activity of TiO2 and ZnO nanomaterials in phosphate buffer and saline solution

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Abstract

We studied antibacterial and photocatalytic activity of anatase TiO2 and ZnO in phosphate buffer and saline solution. We found that the different anions in the suspension medium (chloride and phosphate) significantly affected the following suspension properties: the stability of nanoparticle suspension, the release of metal ions from the nanoparticles, and the production of the reactive oxygen species by the nanoparticles. As a result, antibacterial activity and photocatalytic dye degradation were also affected. However, the effect of the suspension medium was different for ZnO and TiO2. Obtained results are discussed.

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Acknowledgments

Financial support from the project RGC CRF CityU6/CRF/08 and the Strategic Research Theme, University Development Fund, Small Project Funding of the University of Hong Kong, and National Natural Science Foundation of China (NSFC 11204185) is acknowledged. The authors would like to thank ALS Technichem (HK) Pty Ltd for providing the metal content analysis.

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Authors and Affiliations

  1. Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong

    Alan Man Ching Ng, Mu Yao Guo, Yu Hang Leung & Aleksandra B. Djurišić

  2. Department of Physics, South University of Science and Technology of China, Shenzhen, China

    Alan Man Ching Ng, Xu Hu & Shuk Yin Tong

  3. School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong

    Charis May Ngor Chan & Frederick Chi Chung Leung

  4. Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, Hong Kong

    Wai Kin Chan

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  1. Alan Man Ching Ng
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  2. Charis May Ngor Chan
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  3. Mu Yao Guo
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  4. Yu Hang Leung
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  5. Aleksandra B. Djurišić
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  6. Xu Hu
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Correspondence to Aleksandra B. Djurišić.

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Ng, A.M.C., Chan, C.M.N., Guo, M.Y. et al. Antibacterial and photocatalytic activity of TiO2 and ZnO nanomaterials in phosphate buffer and saline solution. Appl Microbiol Biotechnol 97, 5565–5573 (2013). https://doi.org/10.1007/s00253-013-4889-7

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  • DOI: https://doi.org/10.1007/s00253-013-4889-7

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