In situ synthesis of hierarchical cobalt-aluminum layered double hydroxide on boehmite surface for efficient removal of arsenate from aqueous solutions

Effects of solution chemistry factors and sorption mechanism

Seon Yong Lee, Kyung Won Jung, Jae Woo Choi, Young Jae Lee

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

A facile route is reported for the in situ formation of three-dimensionally structured hierarchical Co-Al layered double hydroxide (CoAl-LDH) crystals on a boehmite surface (CoAl-LDH@boehmite) via the dissolution of boehmite followed by the coprecipitation of Co and Al ions on the boehmite surface. The physicochemical properties of the as-prepared materials were characterized and tested for evaluating their sorption affinity toward arsenate (As(V)) in an aqueous solution. The characterization results confirmed that the plate-like CoAl-LDH nanocrystals were densely and uniformly formed on the boehmite surface with a three-dimensional hierarchical structure. Batch experiments were conducted systematically to evaluate the effects of the sorbent dosage, initial pH, competitive anions, and temperature on the sorption behavior of CoAl-LDH@boehmite. The sorption kinetics and isotherms studies indicated that the As(V) sorption processes could be well described by the pseudo-second-order and Sips isotherm models, respectively. The sorption mechanisms were confirmed by various solid phase analyses, including X-ray diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure. These findings suggest that the intercalation of As(V) into the interlayer region via anion exchange and bidentate-binuclear inner-sphere surface complexation due to ligand exchange were responsible for the removal of As(V) by CoAl-LDH@boehmite.

Original languageEnglish
Pages (from-to)914-923
Number of pages10
JournalChemical Engineering Journal
Volume368
DOIs
Publication statusPublished - 2019 Jul 15

Fingerprint

boehmite
arsenate
Cobalt
Aluminum
cobalt
hydroxide
Sorption
aqueous solution
sorption
aluminum
Isotherms
Ion exchange
Negative ions
Anions
isotherm
Infrared transmission
X ray absorption
Intercalation
Coprecipitation
Sorbents

Keywords

  • Anion exchange
  • Arsenic removal
  • Boehmite
  • Hierarchical structure
  • Layered double hydroxide
  • Ligand exchange

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

Cite this

@article{9757d4f1d38246bbb06aa1a60f20178e,
title = "In situ synthesis of hierarchical cobalt-aluminum layered double hydroxide on boehmite surface for efficient removal of arsenate from aqueous solutions: Effects of solution chemistry factors and sorption mechanism",
abstract = "A facile route is reported for the in situ formation of three-dimensionally structured hierarchical Co-Al layered double hydroxide (CoAl-LDH) crystals on a boehmite surface (CoAl-LDH@boehmite) via the dissolution of boehmite followed by the coprecipitation of Co and Al ions on the boehmite surface. The physicochemical properties of the as-prepared materials were characterized and tested for evaluating their sorption affinity toward arsenate (As(V)) in an aqueous solution. The characterization results confirmed that the plate-like CoAl-LDH nanocrystals were densely and uniformly formed on the boehmite surface with a three-dimensional hierarchical structure. Batch experiments were conducted systematically to evaluate the effects of the sorbent dosage, initial pH, competitive anions, and temperature on the sorption behavior of CoAl-LDH@boehmite. The sorption kinetics and isotherms studies indicated that the As(V) sorption processes could be well described by the pseudo-second-order and Sips isotherm models, respectively. The sorption mechanisms were confirmed by various solid phase analyses, including X-ray diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure. These findings suggest that the intercalation of As(V) into the interlayer region via anion exchange and bidentate-binuclear inner-sphere surface complexation due to ligand exchange were responsible for the removal of As(V) by CoAl-LDH@boehmite.",
keywords = "Anion exchange, Arsenic removal, Boehmite, Hierarchical structure, Layered double hydroxide, Ligand exchange",
author = "Lee, {Seon Yong} and Jung, {Kyung Won} and Choi, {Jae Woo} and Lee, {Young Jae}",
year = "2019",
month = "7",
day = "15",
doi = "10.1016/j.cej.2019.03.043",
language = "English",
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pages = "914--923",
journal = "Chemical Engineering Journal",
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T1 - In situ synthesis of hierarchical cobalt-aluminum layered double hydroxide on boehmite surface for efficient removal of arsenate from aqueous solutions

T2 - Effects of solution chemistry factors and sorption mechanism

AU - Lee, Seon Yong

AU - Jung, Kyung Won

AU - Choi, Jae Woo

AU - Lee, Young Jae

PY - 2019/7/15

Y1 - 2019/7/15

N2 - A facile route is reported for the in situ formation of three-dimensionally structured hierarchical Co-Al layered double hydroxide (CoAl-LDH) crystals on a boehmite surface (CoAl-LDH@boehmite) via the dissolution of boehmite followed by the coprecipitation of Co and Al ions on the boehmite surface. The physicochemical properties of the as-prepared materials were characterized and tested for evaluating their sorption affinity toward arsenate (As(V)) in an aqueous solution. The characterization results confirmed that the plate-like CoAl-LDH nanocrystals were densely and uniformly formed on the boehmite surface with a three-dimensional hierarchical structure. Batch experiments were conducted systematically to evaluate the effects of the sorbent dosage, initial pH, competitive anions, and temperature on the sorption behavior of CoAl-LDH@boehmite. The sorption kinetics and isotherms studies indicated that the As(V) sorption processes could be well described by the pseudo-second-order and Sips isotherm models, respectively. The sorption mechanisms were confirmed by various solid phase analyses, including X-ray diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure. These findings suggest that the intercalation of As(V) into the interlayer region via anion exchange and bidentate-binuclear inner-sphere surface complexation due to ligand exchange were responsible for the removal of As(V) by CoAl-LDH@boehmite.

AB - A facile route is reported for the in situ formation of three-dimensionally structured hierarchical Co-Al layered double hydroxide (CoAl-LDH) crystals on a boehmite surface (CoAl-LDH@boehmite) via the dissolution of boehmite followed by the coprecipitation of Co and Al ions on the boehmite surface. The physicochemical properties of the as-prepared materials were characterized and tested for evaluating their sorption affinity toward arsenate (As(V)) in an aqueous solution. The characterization results confirmed that the plate-like CoAl-LDH nanocrystals were densely and uniformly formed on the boehmite surface with a three-dimensional hierarchical structure. Batch experiments were conducted systematically to evaluate the effects of the sorbent dosage, initial pH, competitive anions, and temperature on the sorption behavior of CoAl-LDH@boehmite. The sorption kinetics and isotherms studies indicated that the As(V) sorption processes could be well described by the pseudo-second-order and Sips isotherm models, respectively. The sorption mechanisms were confirmed by various solid phase analyses, including X-ray diffraction, Fourier transform infrared, transmission electron microscopy, X-ray photoelectron spectroscopy, and extended X-ray absorption fine structure. These findings suggest that the intercalation of As(V) into the interlayer region via anion exchange and bidentate-binuclear inner-sphere surface complexation due to ligand exchange were responsible for the removal of As(V) by CoAl-LDH@boehmite.

KW - Anion exchange

KW - Arsenic removal

KW - Boehmite

KW - Hierarchical structure

KW - Layered double hydroxide

KW - Ligand exchange

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U2 - 10.1016/j.cej.2019.03.043

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JF - Chemical Engineering Journal

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