Exposure of Microcystis aeruginosa to hydrogen peroxide and titanium dioxide under visible light conditions

Modeling the impact of hydrogen peroxide and hydroxyl radical on cell rupture and microcystin degradation

Che Wei Chang, Xiangchen Huo, Tsair-Fuh Lin

研究成果: Article

4 引文 (Scopus)

摘要

The aims of this study are to evaluate, under visible light conditions, the ability of H2O2 and TiO2 to produce [rad]OH, their quantitative impacts on the cell integrity of Microcystis, and the subsequent release and degradation of microcystins (MCs). A sequential reaction model was developed, including one sub-model to simulate the rupture kinetics for cell integrity of Microcystis, and another to describe the release and degradation of MCs. For cell rupture, the dual-oxidant Delayed Chick-Watson model (DCWM) and dual-oxidant Hom model (HM) were first proposed and developed, giving excellent simulation results of cell rupture kinetics. Kinetic rate constants between Microcystis cells and H2O2 (kH2O2, Cell) as well as [rad]OH (k•OH, Cell) under visible light successfully separated the individual effects of H2O2 and [rad]OH on Microcystis. The dual-oxidant models were further validated with additional experiments, making the models more convincing. Finally, the dual-oxidant cell rupture models were integrated with the MC degradation model and well predicted the observed MCs concentrations in the experimental systems. The results of this study not only demonstrate the potential application of H2O2 and TiO2 for the control of cyanobacteria and metabolites in natural water bodies, but also provide a new methodology to differentiate the individual contributions of the two oxidants, H2O2 and [rad]OH, on cell rupture, thus giving a novel way to more precisely determine the effective doses of applied oxidants for cyanobacteria control.

原文English
頁(從 - 到)217-226
頁數10
期刊Water Research
141
DOIs
出版狀態Published - 2018 九月 15

指紋

hydroxyl radical
Hydrogen peroxide
Titanium dioxide
hydrogen peroxide
rupture
Oxidants
oxidant
Degradation
degradation
modeling
kinetics
Kinetics
cyanobacterium
exposure
titanium dioxide
Metabolites
Rate constants
metabolite
methodology
simulation

All Science Journal Classification (ASJC) codes

  • Ecological Modelling
  • Water Science and Technology
  • Waste Management and Disposal
  • Pollution

引用此文

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abstract = "The aims of this study are to evaluate, under visible light conditions, the ability of H2O2 and TiO2 to produce [rad]OH, their quantitative impacts on the cell integrity of Microcystis, and the subsequent release and degradation of microcystins (MCs). A sequential reaction model was developed, including one sub-model to simulate the rupture kinetics for cell integrity of Microcystis, and another to describe the release and degradation of MCs. For cell rupture, the dual-oxidant Delayed Chick-Watson model (DCWM) and dual-oxidant Hom model (HM) were first proposed and developed, giving excellent simulation results of cell rupture kinetics. Kinetic rate constants between Microcystis cells and H2O2 (kH2O2, Cell) as well as [rad]OH (k•OH, Cell) under visible light successfully separated the individual effects of H2O2 and [rad]OH on Microcystis. The dual-oxidant models were further validated with additional experiments, making the models more convincing. Finally, the dual-oxidant cell rupture models were integrated with the MC degradation model and well predicted the observed MCs concentrations in the experimental systems. The results of this study not only demonstrate the potential application of H2O2 and TiO2 for the control of cyanobacteria and metabolites in natural water bodies, but also provide a new methodology to differentiate the individual contributions of the two oxidants, H2O2 and [rad]OH, on cell rupture, thus giving a novel way to more precisely determine the effective doses of applied oxidants for cyanobacteria control.",
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T2 - Modeling the impact of hydrogen peroxide and hydroxyl radical on cell rupture and microcystin degradation

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AU - Lin, Tsair-Fuh

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AB - The aims of this study are to evaluate, under visible light conditions, the ability of H2O2 and TiO2 to produce [rad]OH, their quantitative impacts on the cell integrity of Microcystis, and the subsequent release and degradation of microcystins (MCs). A sequential reaction model was developed, including one sub-model to simulate the rupture kinetics for cell integrity of Microcystis, and another to describe the release and degradation of MCs. For cell rupture, the dual-oxidant Delayed Chick-Watson model (DCWM) and dual-oxidant Hom model (HM) were first proposed and developed, giving excellent simulation results of cell rupture kinetics. Kinetic rate constants between Microcystis cells and H2O2 (kH2O2, Cell) as well as [rad]OH (k•OH, Cell) under visible light successfully separated the individual effects of H2O2 and [rad]OH on Microcystis. The dual-oxidant models were further validated with additional experiments, making the models more convincing. Finally, the dual-oxidant cell rupture models were integrated with the MC degradation model and well predicted the observed MCs concentrations in the experimental systems. The results of this study not only demonstrate the potential application of H2O2 and TiO2 for the control of cyanobacteria and metabolites in natural water bodies, but also provide a new methodology to differentiate the individual contributions of the two oxidants, H2O2 and [rad]OH, on cell rupture, thus giving a novel way to more precisely determine the effective doses of applied oxidants for cyanobacteria control.

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