Uptake of arsenite by synthetic layered double hydroxides

Kanchan Grover; Sridhar Komarneni; Hiroaki Katsuki

doi:10.1016/j.watres.2009.06.003

Uptake of arsenite by synthetic layered double hydroxides

Kanchan Grover, Sridhar Komarneni, Hiroaki Katsuki

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101 Citations (SciVal)

Abstract

Two types of layered double hydroxides (LDHs), hydrotalcite and hydrocalumite with different composition of layers and interlayers were investigated for the removal of arsenite from solutions. The kinetics study showed that anion exchange process was very fast and apparently attained a steady-state in the range of 8-16 h. Arsenite removal was found to be 87.5% and 83.6% with the nitrate forms of hydrotalcite and hydrocalumite, respectively. Layered double hydroxides synthesized at room temperature showed higher uptake than those synthesized by hydrothermal method due to small crystal size (high surface area) of the former. As expected, calcined hydrotalcite showed higher uptake than uncalcined carbonate form of hydrotalcite. The uptake process was anion exchange in hydrotalcite-type LDH as confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) but possibly some dissolution-reprecipitation occurred with hydrocalumite-type LDH.

Original language	English (US)
Pages (from-to)	3884-3890
Number of pages	7
Journal	Water Research
Volume	43
Issue number	15
DOIs	https://doi.org/10.1016/j.watres.2009.06.003
State	Published - Aug 2009

All Science Journal Classification (ASJC) codes

Environmental Engineering
Civil and Structural Engineering
Ecological Modeling
Water Science and Technology
Waste Management and Disposal
Pollution

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10.1016/j.watres.2009.06.003

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title = "Uptake of arsenite by synthetic layered double hydroxides",

abstract = "Two types of layered double hydroxides (LDHs), hydrotalcite and hydrocalumite with different composition of layers and interlayers were investigated for the removal of arsenite from solutions. The kinetics study showed that anion exchange process was very fast and apparently attained a steady-state in the range of 8-16 h. Arsenite removal was found to be 87.5% and 83.6% with the nitrate forms of hydrotalcite and hydrocalumite, respectively. Layered double hydroxides synthesized at room temperature showed higher uptake than those synthesized by hydrothermal method due to small crystal size (high surface area) of the former. As expected, calcined hydrotalcite showed higher uptake than uncalcined carbonate form of hydrotalcite. The uptake process was anion exchange in hydrotalcite-type LDH as confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) but possibly some dissolution-reprecipitation occurred with hydrocalumite-type LDH.",

author = "Kanchan Grover and Sridhar Komarneni and Hiroaki Katsuki",

note = "Funding Information: We acknowledge financial support by the College of Agricultural Sciences under Station Research Project No., AES 4319. ",

year = "2009",

month = aug,

doi = "10.1016/j.watres.2009.06.003",

language = "English (US)",

volume = "43",

pages = "3884--3890",

journal = "Water Research",

issn = "0043-1354",

publisher = "Elsevier Limited",

number = "15",

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T1 - Uptake of arsenite by synthetic layered double hydroxides

AU - Grover, Kanchan

AU - Komarneni, Sridhar

AU - Katsuki, Hiroaki

N1 - Funding Information: We acknowledge financial support by the College of Agricultural Sciences under Station Research Project No., AES 4319.

PY - 2009/8

Y1 - 2009/8

N2 - Two types of layered double hydroxides (LDHs), hydrotalcite and hydrocalumite with different composition of layers and interlayers were investigated for the removal of arsenite from solutions. The kinetics study showed that anion exchange process was very fast and apparently attained a steady-state in the range of 8-16 h. Arsenite removal was found to be 87.5% and 83.6% with the nitrate forms of hydrotalcite and hydrocalumite, respectively. Layered double hydroxides synthesized at room temperature showed higher uptake than those synthesized by hydrothermal method due to small crystal size (high surface area) of the former. As expected, calcined hydrotalcite showed higher uptake than uncalcined carbonate form of hydrotalcite. The uptake process was anion exchange in hydrotalcite-type LDH as confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) but possibly some dissolution-reprecipitation occurred with hydrocalumite-type LDH.

AB - Two types of layered double hydroxides (LDHs), hydrotalcite and hydrocalumite with different composition of layers and interlayers were investigated for the removal of arsenite from solutions. The kinetics study showed that anion exchange process was very fast and apparently attained a steady-state in the range of 8-16 h. Arsenite removal was found to be 87.5% and 83.6% with the nitrate forms of hydrotalcite and hydrocalumite, respectively. Layered double hydroxides synthesized at room temperature showed higher uptake than those synthesized by hydrothermal method due to small crystal size (high surface area) of the former. As expected, calcined hydrotalcite showed higher uptake than uncalcined carbonate form of hydrotalcite. The uptake process was anion exchange in hydrotalcite-type LDH as confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM) but possibly some dissolution-reprecipitation occurred with hydrocalumite-type LDH.

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DO - 10.1016/j.watres.2009.06.003

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SP - 3884

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JO - Water Research

JF - Water Research

IS - 15

ER -

Uptake of arsenite by synthetic layered double hydroxides

Abstract

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