Removal of chromate from aqueous solution by reduction with nanoscale Fe–Al layered double hydroxide

Leila Alidokht; Shahin Oustan; Alireza Khataee; Mohammadreza Neyshabouri; Adel Reyhanitabar

doi:10.1007/s11164-017-3231-x

Removal of chromate from aqueous solution by reduction with nanoscale Fe–Al layered double hydroxide

Leila Alidokht, Shahin Oustan^*, Alireza Khataee, Mohammadreza Neyshabouri, Adel Reyhanitabar

^*Corresponding author for this work

University of Tabriz

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

Nanoscale layered double hydroxides of Fe^II and Al^III (Fe–Al LDH) have been applied for removal of chromate (Cr^VI) from aqueous solution. Given the reaction stoichiometry, Cr^VI was completely reduced to Cr^III and coprecipitated with Fe^III and Al^III oxyhydroxides. The extent of Cr^VI removal decreased with increasing initial pH and decreasing molar ratio of Cr^VI/structural Fe^II in the LDH. The chromate reduction rate at different initial concentrations of Cr^VI was well described by the pseudo-second-order model with reaction rate constant ranging from 197.4 to 13.53 (mmol min)⁻¹. Initial pH and substitution of various amounts of Fe^III in the LDH structure had little effect on the reaction rate. Backtransformation of Cr^III to Cr^VI by birnessite Mn oxide (δ-MnO₂) after 40 days of reaction was less than 1% of the initial Cr (as Cr^III solid), indicating high stability of the final reaction products and high efficiency of nanoscale Fe–Al LDHs for removal of chromate from aqueous solution.

Original language	English
Pages (from-to)	2319-2331
Number of pages	13
Journal	Research on Chemical Intermediates
Volume	44
Issue number	4
DOIs	https://doi.org/10.1007/s11164-017-3231-x
Publication status	Published - 1 Apr 2018
Externally published	Yes

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Publisher Copyright:
© 2017, Springer Science+Business Media B.V., part of Springer Nature.

Keywords

Backtransformation
Birnessite
Chromate reduction
Kinetic modeling
Nanoscale Fe–Al LDH
XPS analysis

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abstract = "Nanoscale layered double hydroxides of FeII and AlIII (Fe–Al LDH) have been applied for removal of chromate (CrVI) from aqueous solution. Given the reaction stoichiometry, CrVI was completely reduced to CrIII and coprecipitated with FeIII and AlIII oxyhydroxides. The extent of CrVI removal decreased with increasing initial pH and decreasing molar ratio of CrVI/structural FeII in the LDH. The chromate reduction rate at different initial concentrations of CrVI was well described by the pseudo-second-order model with reaction rate constant ranging from 197.4 to 13.53 (mmol min)−1. Initial pH and substitution of various amounts of FeIII in the LDH structure had little effect on the reaction rate. Backtransformation of CrIII to CrVI by birnessite Mn oxide (δ-MnO2) after 40 days of reaction was less than 1% of the initial Cr (as CrIII solid), indicating high stability of the final reaction products and high efficiency of nanoscale Fe–Al LDHs for removal of chromate from aqueous solution.",

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AU - Alidokht, Leila

AU - Oustan, Shahin

AU - Khataee, Alireza

AU - Neyshabouri, Mohammadreza

AU - Reyhanitabar, Adel

PY - 2018/4/1

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N2 - Nanoscale layered double hydroxides of FeII and AlIII (Fe–Al LDH) have been applied for removal of chromate (CrVI) from aqueous solution. Given the reaction stoichiometry, CrVI was completely reduced to CrIII and coprecipitated with FeIII and AlIII oxyhydroxides. The extent of CrVI removal decreased with increasing initial pH and decreasing molar ratio of CrVI/structural FeII in the LDH. The chromate reduction rate at different initial concentrations of CrVI was well described by the pseudo-second-order model with reaction rate constant ranging from 197.4 to 13.53 (mmol min)−1. Initial pH and substitution of various amounts of FeIII in the LDH structure had little effect on the reaction rate. Backtransformation of CrIII to CrVI by birnessite Mn oxide (δ-MnO2) after 40 days of reaction was less than 1% of the initial Cr (as CrIII solid), indicating high stability of the final reaction products and high efficiency of nanoscale Fe–Al LDHs for removal of chromate from aqueous solution.

AB - Nanoscale layered double hydroxides of FeII and AlIII (Fe–Al LDH) have been applied for removal of chromate (CrVI) from aqueous solution. Given the reaction stoichiometry, CrVI was completely reduced to CrIII and coprecipitated with FeIII and AlIII oxyhydroxides. The extent of CrVI removal decreased with increasing initial pH and decreasing molar ratio of CrVI/structural FeII in the LDH. The chromate reduction rate at different initial concentrations of CrVI was well described by the pseudo-second-order model with reaction rate constant ranging from 197.4 to 13.53 (mmol min)−1. Initial pH and substitution of various amounts of FeIII in the LDH structure had little effect on the reaction rate. Backtransformation of CrIII to CrVI by birnessite Mn oxide (δ-MnO2) after 40 days of reaction was less than 1% of the initial Cr (as CrIII solid), indicating high stability of the final reaction products and high efficiency of nanoscale Fe–Al LDHs for removal of chromate from aqueous solution.

KW - Backtransformation

KW - Birnessite

KW - Chromate reduction

KW - Kinetic modeling

KW - Nanoscale Fe–Al LDH

KW - XPS analysis

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Removal of chromate from aqueous solution by reduction with nanoscale Fe–Al layered double hydroxide

Abstract

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Keywords

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