Inactivation of Bacteria in Water by Ferrate(VI): Efficiency and Mechanisms

Ferrate (Fe­(VI)) is an emerging green disinfectant and has received increasing attention nowadays. This study conducted systematic analyses of Fe­(VI) disinfection on six typical bacteria in different water matrices. The results showed that Fe­(VI) was more effective in inactivating Gram-negative (...

Full description

Saved in:
Bibliographic Details
Published in:Environmental science & technology 2023-12, Vol.57 (49), p.20893-20904
Main Authors: Mao, Yu, Chen, Zhuo, Lu, Yun, Cao, Ke-Fan, Wu, Yinhu, Hu, Hong-Ying
Format: Article
Language:English
Subjects:
Bacteria
Buffers
Cell membranes
Cell walls
Deactivation
Disinfectants
Disinfection
Disinfection & disinfectants
Gram-negative bacteria
Gram-positive bacteria
Inactivation
Iron - chemistry
Lipopolysaccharides
Oxidation-Reduction
Peptidoglycans
Phospholipids
Physico-Chemical Treatment and Resource Recovery
Proteins
Rate constants
Water
Water Pollutants, Chemical - analysis
Water Purification - methods
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Ferrate (Fe­(VI)) is an emerging green disinfectant and has received increasing attention nowadays. This study conducted systematic analyses of Fe­(VI) disinfection on six typical bacteria in different water matrices. The results showed that Fe­(VI) was more effective in inactivating Gram-negative (G−) bacteria than Gram-positive (G+) bacteria, and the disinfection performance of Fe­(VI) was better in a phosphate buffer than that in a borate buffer and secondary effluent. The inactivation rate constants of G– bacteria were significantly higher than those of G+ bacteria. The cell membrane damage of G– bacteria was also more severe than that of G+ bacteria after Fe­(VI) treatment. The cell wall structure, especially cell wall thickness, might account for the difference of the inactivation efficiency between G– bacteria and G+ bacteria. Moreover, it is revealed that Fe­(VI) primarily reacted with proteins rather than other biological molecules (i.e., phospholipids, peptidoglycan, and lipopolysaccharide). This was further evidenced by the reduction of bacterial autofluorescence due to the destruction of bacterial proteins during Fe­(VI) inactivation. Overall, this study advances the understanding of Fe­(VI) disinfection mechanisms and provides valuable information for the Fe­(VI) application in water disinfection.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.3c05118