Enhanced Visible-Light-Driven Photocatalytic Bacterial Inactivation by Ultrathin Carbon-Coated Magnetic Cobalt Ferrite Nanoparticles
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摘要Ultrathin hydrothermal carbonation carbon (HTCC)-coated cobalt ferrite (CoFe2O4) composites with HTCC coating thicknesses between 0.62 and 4.38 nm were fabricated as novel, efficient, and magnetically recyclable photocatalysts via a facile, green approach. The CoFe2O4/HTCC composites showed high magnetization and low coercivity, which favored magnetic separation for reuse. The results show that the close coating of HTCC on CoFe2O4 nanoparticles enhanced electron transfer and charge separation, leading to a significant improvement in photocatalytic efficiency. The composites exhibited superior photocatalytic inactivation toward Escherichia coli K-12 under visible-light irradiation, with the complete inactivation of 7 log10 cfu·mL–1 of bacterial cells within 60 min. The destruction of bacterial cell membranes was monitored by field-effect scanning electron microscopy analysis and fluorescence microscopic images. The bacterial inactivation mechanism was investigated in a scavenger study, and •O2, H2O2, and h+ were identified as the major reactive species for bacterial inactivation. Multiple cycle runs revealed that these composites had excellent stability and reusability. In addition, the composites showed good photocatalytic bacterial inactivation performance in authentic water matrices such as surface water samples and secondarily treated sewage effluents. The results of this work indicate that CoFe2O4/HTCC composites have great potential in large-scale photocatalytic disinfection operations.
著者Tianqi Wang, Zhifeng Jiang, Taicheng An, Guiying Li, Huijun Zhao, Po Keung Wong
期刊名稱Environmental Science and Technology
出版年份2018
月份4
日期17
卷號52
期次8
出版社American Chemical Society
出版地Washington DC
頁次4774 - 4784
國際標準期刊號0013-936X
電子國際標準期刊號1520-5851
語言美式英語
關鍵詞Photocatalysis, Magnetic catalyst, Bacterial inactivation, Ultrathin carbon, Ferrite nanoparticle

上次更新時間 2020-30-09 於 00:46