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Novel Crayfish Shell Biochar Nanocomposites Loaded with Ag-TiO2 Nanoparticles Exhibit Robust Antibacterial Activity

Author:
Zeng, Yifan, Xue, Yingwen, Long, Li, Yan, Jinpeng
Source:
Water, air, and soil pollution 2019 v.230 no.2 pp. 50
ISSN:
0049-6979
Subject:
Escherichia coli, antibacterial properties, biochar, nanocomposites, nanoparticles, nanosilver, silver, silver nitrate, solar radiation, titanium dioxide, water treatment
Abstract:
A fast sol-dipping-gel method was applied to load Ag and TiO₂ nanoparticles on the surface of crayfish shell biochar to make an inexpensive and novel nanocomposite. Tetra-n-butyl titanate (Ti(OC₄H₉)₄) and silver nitrate (AgNO₃) were used as the nanoparticle precursors. Crayfish shell was pyrolyzed to produce the biochar host. Paper-disk diffusion method was applied to measure antibacterial activities of the nanocomposites to E. coli. The maximum loading rate of TiO₂ and Ag nanoparticles on the biochar reached 7.54% and 3.20%, respectively. Results of long-term antibacterial effect experiment showed that the Ag-TiO₂-biochar had robust antibacterial activity and could be reused for multiple times. The inactivation of E. coli of initial concentration of 10⁵ CFU/mL by Ag-TiO₂-biochar under solar light reached around 99% of sterilization ratio in 5 min. In addition, the antibacterial ability of the nanocomposite was better in light than that in dark due to the presence of TiO₂. Findings of this study suggest that the novel nanocomposite is a promising material for water treatment units and household water purifiers.
Agid:
6303469