Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 381, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2019.121006
Keywords
Photocatalysis; E. coli inactivation; CuBi2O4/Bi2MoO5; Visible light irradiation; p-n heterojunction
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Funding
- National Natural Science Foundation of China [21476183]
- Natural Science Basic Research Plan in Shaanxi Province of China [2018JM5020]
- Open Research Fund of State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Chinese Academy of Sciences [T151702]
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Here, a novel CuBi2O4/Bi2MoO6 (CBO/BMO) p-n heterojunction was fabricated and exhibited markedly improved photocatalytic inactivation capacity of E. coli cells under visible light excitation (lambda > 420 nm) compared with pure CuBi2O4 and Bi2MoO(6). The CBO/BMO-0.5 hybrid displayed the highest photoinactivation ability which could completely inactivate the E. coli cells within 4h. The mechanism of photocatalytic disinfection towards E. coli of CBO/BMO heterojunctions was attributed to the disruption of cell-membrane, leakage and damage of cellular content including total protein and DNA as verified with SEM, fluorescence-base dead/live stain, sodium dodecyl sulfate polyacrylamide gel electropheresis (SDS-PAGE) and agarose gel electrophoresis (AGE). Additionally, the scavenge experiments showed that the reactive species h(+), e(-) and center dot O-2(-) play the predominant role in the photocatalytic system of CBO/BMO hybrids. The improved photocatalytic activity of CBO/BMO composites was mainly attributed to the promotion of spatial separation and migration rate of photoproduced electron-hole pairs, enhancement of visible light absorption and more generation of reactive species (center dot O-2(-)) on the interface of catalyst and water which was demonstrated by nitroblue tetrazolium (NBT) and EPR. Our work indicated that construction of CuBi2O4/Bi2MoO6 p-n heterostructure photocatalyst is a promising environmental friendly alternative method to deal with the biohazards of pathogenic microorganisms.
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