Journal
CHEMOSPHERE
Volume 184, Issue -, Pages 347-357Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2017.05.118
Keywords
Graphene sponge; Copper nanoparticles; Bactericidal filter; Membrane damage; Oxidative stress
Categories
Funding
- National Natural Science Foundation of China [51521006, 51579095, 51378190, 21675043]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT-13R17]
- Hunan province university innovation platform open fund project [14K020]
- Interdisciplinary Research Funds for Hunan University
- Scientific Research Foundation, State Education Ministry
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Nanotechnology has great potential in water purification. However, the limitations such as aggregation and toxicity of nanomaterials have blocked their practical application. In this work, a novel copper nanoparticles-decorated graphene sponge (Cu-GS) was synthesized using a facile hydrothermal method. Cu-GS consisting of three-dimensional (3D) porous graphene network and well-dispersed Cu nano particles exhibited high antibacterial efficiency against Esherichia coil when used as a bactericidal filter. The morphological changes determined by scanning electron microscope and fluorescence images measured by flow cytometry confirmed the involvement of membrane damage induced by Cu-GS in their antibacterial process. The oxidative ability of Cu-GS and intercellular reactive oxygen species (ROS) were also determined to elucidate the possible antibacterial mechanism of Cu-GS. Moreover, the concentration of released copper ions from Cu-GS was far below the drinking water standard, and the copper ions also have an effect on the antibacterial activity of Cu-GS. Results suggested that Cu-GS as a novel bactericidal filter possessed a potential application of water disinfection. (C) 2017 Elsevier Ltd. All rights reserved.
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