TY - JOUR
T1 - Ultra-effective integrated technologies for water disinfection with a novel 0D-2D-3D nanostructured rGO-AgNP/Bi2Fe4O9 composite
AU - Hu, Zhong Ting
AU - Liang, Yen Nan
AU - Zhao, Jun
AU - Zhang, Yingdan
AU - Yang, En Hua
AU - Chen, Jianmeng
AU - Lim, Teik Thye
N1 - Funding Information:
The authors would like to acknowledge financial support from Centre of Infrastructure, School of Civil and Environmental Engineering, Nanyang Technological University, Singapore (M060030001). The authors are grateful to the laboratory staff of the Central Environmental Science and Engineering Laboratory (CESEL) and FACTS (Facility for Analysis, Characterisation Testing and Simulation) for their kind assistance.
Publisher Copyright:
© 2018 Published by Elsevier B.V.
PY - 2018/7/5
Y1 - 2018/7/5
N2 - Emerging technologies for water disinfection is being developed to reduce waterborne disease efficiently. Herein, we report a novel bactericidal technology incorporating 0D-2D-3D nanostructured rGO-Ag/Bi2Fe4O9 (BFOA-G) composites which exhibited ultra-effective disinfection efficacies towards Gram-negative E. coli and P. aeruginosa, and Gram-positive S. aureus. Owing to the synergistic action among BFO (Bi2Fe4O9), AgNPs (Ag nanoparticles) and rGO (reduced graphene oxide) within BFOA-G, the H2O2/Vis/BFOA-G system (Vis, 420 < λ < 630 nm) showed remarkable bactericidal performance of approaching 100% efficacy (≥6 logs) of E. coli in 20 min with the inhibition of Ag+ leaching (usually achieving 3 logs of bacterial reduction around 1–4 h in photocatalytic disinfection). This system is defined as “integrated technology” that involves varied disinfection processes/mechanisms of rGO-assisted Ag+ release, Ag-assisted Fenton reaction, Ag/rGO co-assisted photocatalysis and Ag-assisted photo-Fenton oxidation. This novel BFOA-G was produced by incorporating the in-situ synthesized 0D-3D Ag-BFO (AgNP size of 5–20 nm) with 2D rGO via a facile evaporation process at 75 °C. The bacterial cell membrane damage caused by reactive oxygen species (ROSs) was verified by staining the cells using Live/Dead Baclight Kit. This study provides new insights into potential of nanostructured composites for developing innovative water disinfection technologies.
AB - Emerging technologies for water disinfection is being developed to reduce waterborne disease efficiently. Herein, we report a novel bactericidal technology incorporating 0D-2D-3D nanostructured rGO-Ag/Bi2Fe4O9 (BFOA-G) composites which exhibited ultra-effective disinfection efficacies towards Gram-negative E. coli and P. aeruginosa, and Gram-positive S. aureus. Owing to the synergistic action among BFO (Bi2Fe4O9), AgNPs (Ag nanoparticles) and rGO (reduced graphene oxide) within BFOA-G, the H2O2/Vis/BFOA-G system (Vis, 420 < λ < 630 nm) showed remarkable bactericidal performance of approaching 100% efficacy (≥6 logs) of E. coli in 20 min with the inhibition of Ag+ leaching (usually achieving 3 logs of bacterial reduction around 1–4 h in photocatalytic disinfection). This system is defined as “integrated technology” that involves varied disinfection processes/mechanisms of rGO-assisted Ag+ release, Ag-assisted Fenton reaction, Ag/rGO co-assisted photocatalysis and Ag-assisted photo-Fenton oxidation. This novel BFOA-G was produced by incorporating the in-situ synthesized 0D-3D Ag-BFO (AgNP size of 5–20 nm) with 2D rGO via a facile evaporation process at 75 °C. The bacterial cell membrane damage caused by reactive oxygen species (ROSs) was verified by staining the cells using Live/Dead Baclight Kit. This study provides new insights into potential of nanostructured composites for developing innovative water disinfection technologies.
KW - AgNPs
KW - Nanostructured composites
KW - Pathogen inactivation
KW - Reduced graphene oxide
KW - Visible-light-driven catalysis
UR - http://www.scopus.com/inward/record.url?scp=85042941198&partnerID=8YFLogxK
U2 - 10.1016/j.apcatb.2018.01.047
DO - 10.1016/j.apcatb.2018.01.047
M3 - Journal article
AN - SCOPUS:85042941198
SN - 0926-3373
VL - 227
SP - 548
EP - 556
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
ER -
