Ferrate(VI) decomposition in water in the absence and presence of natural organic matter (NOM)

Yang Deng, Chanil Jung, Yongmei Liang, Nina Goodey, Thomas D. Waite

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

The kinetics of ferrate(VI) decomposition in natural water were assessed in the absence and presence of natural organic matter (NOM) (pH = 7.50, [Fe(VI)] = 54 µM, DOC = 0.00–10.00 and 1.00–8.57 mg/L for a simulated natural water and six real natural waters, respectively). Without NOM, Fe(VI) decomposition in simulated natural water exhibited a biphasic kinetics pattern, i.e. a 2 nd -order reaction with respect to Fe(VI) concentration followed by a 1 st -order reaction. However, an additional instant Fe(VI) loss was observed at the onset in the presence of NOM for both simulated and real natural waters, thereby rendering Fe(VI) decay with NOM a unique three-stage kinetics pattern. The initial instant Fe(VI) loss was caused due to the homogenous Fe(VI) self-decay and the rapid reactions between Fe(VI) and NOM. The latter accounted for a major fraction of the initial Fe(VI) loss and was in direct proportion with the initial DOC (DOC 0 ) (Δ[Fe(VI)] 0 DOC = α NOM DOC 0 ; α NOM = 1.45 µM Fe(VI)·L/mg DOC for the simulated natural water, and 0.66–1.35 µM Fe(VI)·L/mg DOC for the six natural waters). Fe(VI) decomposition experiments with different Suwannee River NOM isolates revealed that hydrophobic NOM fractions (i.e. fulvic acid (FA) and humic acid (HA)) caused a more significant initial Fe(VI) loss than the hydrophilic group (HPI), suggesting that Fe(VI) preferentially reacted with hydrophobic NOM molecules rather than hydrophilic compounds. Furthermore, an approach developed for the estimation of α NOM revealed a linear correlation between α NOM and specific UV absorbance (SUVA) (α NOM = 0.27SUVA + 0.18, R 2 = 0.71). This study provides essential information regarding Fe(VI) decomposition for the determination of Fe(VI) dose and exposure for effective water treatment.

Original languageEnglish
Pages (from-to)2335-2342
Number of pages8
JournalChemical Engineering Journal
Volume334
DOIs
StatePublished - 15 Feb 2018

Fingerprint

Biological materials
decomposition
Decomposition
organic matter
Water
water
kinetics
ferrate ion
Kinetics
Humic Substances
fulvic acid
Water treatment
absorbance
humic acid
water treatment
Rivers

Keywords

  • Decomposition
  • Drinking water treatment
  • Ferrate(VI)
  • Initial Fe(VI) loss
  • Natural organic matter (NOM)
  • Specific UV absorbance (SUVA)

Cite this

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title = "Ferrate(VI) decomposition in water in the absence and presence of natural organic matter (NOM)",
abstract = "The kinetics of ferrate(VI) decomposition in natural water were assessed in the absence and presence of natural organic matter (NOM) (pH = 7.50, [Fe(VI)] = 54 µM, DOC = 0.00–10.00 and 1.00–8.57 mg/L for a simulated natural water and six real natural waters, respectively). Without NOM, Fe(VI) decomposition in simulated natural water exhibited a biphasic kinetics pattern, i.e. a 2 nd -order reaction with respect to Fe(VI) concentration followed by a 1 st -order reaction. However, an additional instant Fe(VI) loss was observed at the onset in the presence of NOM for both simulated and real natural waters, thereby rendering Fe(VI) decay with NOM a unique three-stage kinetics pattern. The initial instant Fe(VI) loss was caused due to the homogenous Fe(VI) self-decay and the rapid reactions between Fe(VI) and NOM. The latter accounted for a major fraction of the initial Fe(VI) loss and was in direct proportion with the initial DOC (DOC 0 ) (Δ[Fe(VI)] 0 DOC = α NOM DOC 0 ; α NOM = 1.45 µM Fe(VI)·L/mg DOC for the simulated natural water, and 0.66–1.35 µM Fe(VI)·L/mg DOC for the six natural waters). Fe(VI) decomposition experiments with different Suwannee River NOM isolates revealed that hydrophobic NOM fractions (i.e. fulvic acid (FA) and humic acid (HA)) caused a more significant initial Fe(VI) loss than the hydrophilic group (HPI), suggesting that Fe(VI) preferentially reacted with hydrophobic NOM molecules rather than hydrophilic compounds. Furthermore, an approach developed for the estimation of α NOM revealed a linear correlation between α NOM and specific UV absorbance (SUVA) (α NOM = 0.27SUVA + 0.18, R 2 = 0.71). This study provides essential information regarding Fe(VI) decomposition for the determination of Fe(VI) dose and exposure for effective water treatment.",
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Ferrate(VI) decomposition in water in the absence and presence of natural organic matter (NOM). / Deng, Yang; Jung, Chanil; Liang, Yongmei; Goodey, Nina; Waite, Thomas D.

In: Chemical Engineering Journal, Vol. 334, 15.02.2018, p. 2335-2342.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Ferrate(VI) decomposition in water in the absence and presence of natural organic matter (NOM)

AU - Deng, Yang

AU - Jung, Chanil

AU - Liang, Yongmei

AU - Goodey, Nina

AU - Waite, Thomas D.

PY - 2018/2/15

Y1 - 2018/2/15

N2 - The kinetics of ferrate(VI) decomposition in natural water were assessed in the absence and presence of natural organic matter (NOM) (pH = 7.50, [Fe(VI)] = 54 µM, DOC = 0.00–10.00 and 1.00–8.57 mg/L for a simulated natural water and six real natural waters, respectively). Without NOM, Fe(VI) decomposition in simulated natural water exhibited a biphasic kinetics pattern, i.e. a 2 nd -order reaction with respect to Fe(VI) concentration followed by a 1 st -order reaction. However, an additional instant Fe(VI) loss was observed at the onset in the presence of NOM for both simulated and real natural waters, thereby rendering Fe(VI) decay with NOM a unique three-stage kinetics pattern. The initial instant Fe(VI) loss was caused due to the homogenous Fe(VI) self-decay and the rapid reactions between Fe(VI) and NOM. The latter accounted for a major fraction of the initial Fe(VI) loss and was in direct proportion with the initial DOC (DOC 0 ) (Δ[Fe(VI)] 0 DOC = α NOM DOC 0 ; α NOM = 1.45 µM Fe(VI)·L/mg DOC for the simulated natural water, and 0.66–1.35 µM Fe(VI)·L/mg DOC for the six natural waters). Fe(VI) decomposition experiments with different Suwannee River NOM isolates revealed that hydrophobic NOM fractions (i.e. fulvic acid (FA) and humic acid (HA)) caused a more significant initial Fe(VI) loss than the hydrophilic group (HPI), suggesting that Fe(VI) preferentially reacted with hydrophobic NOM molecules rather than hydrophilic compounds. Furthermore, an approach developed for the estimation of α NOM revealed a linear correlation between α NOM and specific UV absorbance (SUVA) (α NOM = 0.27SUVA + 0.18, R 2 = 0.71). This study provides essential information regarding Fe(VI) decomposition for the determination of Fe(VI) dose and exposure for effective water treatment.

AB - The kinetics of ferrate(VI) decomposition in natural water were assessed in the absence and presence of natural organic matter (NOM) (pH = 7.50, [Fe(VI)] = 54 µM, DOC = 0.00–10.00 and 1.00–8.57 mg/L for a simulated natural water and six real natural waters, respectively). Without NOM, Fe(VI) decomposition in simulated natural water exhibited a biphasic kinetics pattern, i.e. a 2 nd -order reaction with respect to Fe(VI) concentration followed by a 1 st -order reaction. However, an additional instant Fe(VI) loss was observed at the onset in the presence of NOM for both simulated and real natural waters, thereby rendering Fe(VI) decay with NOM a unique three-stage kinetics pattern. The initial instant Fe(VI) loss was caused due to the homogenous Fe(VI) self-decay and the rapid reactions between Fe(VI) and NOM. The latter accounted for a major fraction of the initial Fe(VI) loss and was in direct proportion with the initial DOC (DOC 0 ) (Δ[Fe(VI)] 0 DOC = α NOM DOC 0 ; α NOM = 1.45 µM Fe(VI)·L/mg DOC for the simulated natural water, and 0.66–1.35 µM Fe(VI)·L/mg DOC for the six natural waters). Fe(VI) decomposition experiments with different Suwannee River NOM isolates revealed that hydrophobic NOM fractions (i.e. fulvic acid (FA) and humic acid (HA)) caused a more significant initial Fe(VI) loss than the hydrophilic group (HPI), suggesting that Fe(VI) preferentially reacted with hydrophobic NOM molecules rather than hydrophilic compounds. Furthermore, an approach developed for the estimation of α NOM revealed a linear correlation between α NOM and specific UV absorbance (SUVA) (α NOM = 0.27SUVA + 0.18, R 2 = 0.71). This study provides essential information regarding Fe(VI) decomposition for the determination of Fe(VI) dose and exposure for effective water treatment.

KW - Decomposition

KW - Drinking water treatment

KW - Ferrate(VI)

KW - Initial Fe(VI) loss

KW - Natural organic matter (NOM)

KW - Specific UV absorbance (SUVA)

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