TY - JOUR
T1 - Highly-efficient photocatalytic disinfection of Escherichia coli under visible light using carbon supported Vanadium Tetrasulfide nanocomposites
AU - Zhang, Baogang
AU - Zou, Shiqiang
AU - Cai, Ruquan
AU - Li, Min
AU - He, Zhen
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2018/5
Y1 - 2018/5
N2 - Reliable and effective water disinfectants are of paramount importance to address mounting health concerns in drinking water. Herein, Vanadium Tetrasulfide (VS4) nanocomposites supported by different carbon materials, including VS4/CP (carbon powder), VS4/rGO (reduced graphene oxides), VS4/CF (carbon fiber), and VS4/CNT (carbon nanotube), were synthesized, comprehensively characterized, and investigated as photocatalytic disinfectants. Among them, the cost-effective and lattice-structure VS4/CP exhibited the best disinfection performance for removing E. coli (Gram-negative) under both simulated visible light and sunlight, with a maximum inactivation rate of 9.7 log at 0.1 g L−1 in 30 min. However, it was not very effective to eliminate S. aureus (Gram-positive bacteria) with a disinfection rate of 1.7 log inactivation in 30 min. Consistent disinfection performance was confirmed with four successive stability tests and over a wide range of E. coli density (6 log to 9 log CFU ml−1). The potential disinfection mechanism was studied on a subcellular level, indicating that membrane damage (via mineralization, lipid peroxidation and collapsed membrane potential) and penetration-induced intracellular damage including DNA degradation and decreased ATP level could be the main inactivation principles. Further photochemical investigation suggested that [rad]O2−, h+ and e− were crucial active species, and an acidic/neutral environment would favor the photocatalytic disinfection. These results have demonstrated effectiveness and potential applications of the developed VS4/CP nanocomposites in water disinfection.
AB - Reliable and effective water disinfectants are of paramount importance to address mounting health concerns in drinking water. Herein, Vanadium Tetrasulfide (VS4) nanocomposites supported by different carbon materials, including VS4/CP (carbon powder), VS4/rGO (reduced graphene oxides), VS4/CF (carbon fiber), and VS4/CNT (carbon nanotube), were synthesized, comprehensively characterized, and investigated as photocatalytic disinfectants. Among them, the cost-effective and lattice-structure VS4/CP exhibited the best disinfection performance for removing E. coli (Gram-negative) under both simulated visible light and sunlight, with a maximum inactivation rate of 9.7 log at 0.1 g L−1 in 30 min. However, it was not very effective to eliminate S. aureus (Gram-positive bacteria) with a disinfection rate of 1.7 log inactivation in 30 min. Consistent disinfection performance was confirmed with four successive stability tests and over a wide range of E. coli density (6 log to 9 log CFU ml−1). The potential disinfection mechanism was studied on a subcellular level, indicating that membrane damage (via mineralization, lipid peroxidation and collapsed membrane potential) and penetration-induced intracellular damage including DNA degradation and decreased ATP level could be the main inactivation principles. Further photochemical investigation suggested that [rad]O2−, h+ and e− were crucial active species, and an acidic/neutral environment would favor the photocatalytic disinfection. These results have demonstrated effectiveness and potential applications of the developed VS4/CP nanocomposites in water disinfection.
KW - Escherichia coli
KW - Nanocomposites
KW - Photocatalytic disinfection
KW - Vanadium Tetrasulfide
KW - Visible light
UR - https://www.scopus.com/pages/publications/85032709859
U2 - 10.1016/j.apcatb.2017.10.065
DO - 10.1016/j.apcatb.2017.10.065
M3 - Article
AN - SCOPUS:85032709859
SN - 0926-3373
VL - 224
SP - 383
EP - 393
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -