Kinetics of Cr(VI) removal by Mg-Al layered double hydroxide doped with Fe2+

Tomohito Kameda; Eisuke Kondo; Toshiaki Yoshioka

doi:10.1016/j.jwpe.2014.09.011

Kinetics of Cr(VI) removal by Mg-Al layered double hydroxide doped with Fe²⁺

Tomohito Kameda, Eisuke Kondo, Toshiaki Yoshioka

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

12 Citations (Scopus)

Abstract

The removal of Cr(VI) from aqueous solution by a Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe²⁺ increased with time and temperature. Cr(VI) removal could not be described by first-order reaction kinetics, but it was well represented as a pseudo second-order reaction. The apparent rate constants at 10, 30, and 60°C were 0.9×10^-3, 1.2×10^-3, and 2.2×10^-3gmmol^-1min^-1, respectively, and the apparent activation energy was 14.5kJmol^-1. This value confirms that the rate-determining step for Cr(VI) removal is chemical adsorption involving the anion exchange of Cr₂O₇^2- with intercalated Cl^- and the adsorption of Cr₂O₇^2- on the surface of the produced FeO(OH).

Original language	English
Pages (from-to)	134-136
Number of pages	3
Journal	Journal of Water Process Engineering
Volume	4
Issue number	C
DOIs	https://doi.org/10.1016/j.jwpe.2014.09.011
Publication status	Published - 2014

Keywords

Cr(VI)
Doping
Fe
Kinetics
Layered double hydroxide
Removal

ASJC Scopus subject areas

Biotechnology
Safety, Risk, Reliability and Quality
Waste Management and Disposal
Process Chemistry and Technology

Access to Document

10.1016/j.jwpe.2014.09.011

Cite this

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title = "Kinetics of Cr(VI) removal by Mg-Al layered double hydroxide doped with Fe2+",

abstract = "The removal of Cr(VI) from aqueous solution by a Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe2+ increased with time and temperature. Cr(VI) removal could not be described by first-order reaction kinetics, but it was well represented as a pseudo second-order reaction. The apparent rate constants at 10, 30, and 60°C were 0.9×10-3, 1.2×10-3, and 2.2×10-3gmmol-1min-1, respectively, and the apparent activation energy was 14.5kJmol-1. This value confirms that the rate-determining step for Cr(VI) removal is chemical adsorption involving the anion exchange of Cr2O72- with intercalated Cl- and the adsorption of Cr2O72- on the surface of the produced FeO(OH).",

keywords = "Cr(VI), Doping, Fe, Kinetics, Layered double hydroxide, Removal",

author = "Tomohito Kameda and Eisuke Kondo and Toshiaki Yoshioka",

note = "Funding Information: This research was partially supported a by Grant-in-Aid for Challenging Exploratory Research ( 23651061 ) from the Ministry of Education, Science, Sports, and Culture, Japan , 2011–2013. Publisher Copyright: {\textcopyright} 2014 Elsevier Ltd.",

year = "2014",

doi = "10.1016/j.jwpe.2014.09.011",

language = "English",

volume = "4",

pages = "134--136",

journal = "Journal of Water Process Engineering",

issn = "2214-7144",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Kinetics of Cr(VI) removal by Mg-Al layered double hydroxide doped with Fe2+

AU - Kameda, Tomohito

AU - Kondo, Eisuke

AU - Yoshioka, Toshiaki

N1 - Funding Information: This research was partially supported a by Grant-in-Aid for Challenging Exploratory Research ( 23651061 ) from the Ministry of Education, Science, Sports, and Culture, Japan , 2011–2013. Publisher Copyright: © 2014 Elsevier Ltd.

PY - 2014

Y1 - 2014

N2 - The removal of Cr(VI) from aqueous solution by a Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe2+ increased with time and temperature. Cr(VI) removal could not be described by first-order reaction kinetics, but it was well represented as a pseudo second-order reaction. The apparent rate constants at 10, 30, and 60°C were 0.9×10-3, 1.2×10-3, and 2.2×10-3gmmol-1min-1, respectively, and the apparent activation energy was 14.5kJmol-1. This value confirms that the rate-determining step for Cr(VI) removal is chemical adsorption involving the anion exchange of Cr2O72- with intercalated Cl- and the adsorption of Cr2O72- on the surface of the produced FeO(OH).

AB - The removal of Cr(VI) from aqueous solution by a Mg-Al layered double hydroxide (Mg-Al LDH) doped with Fe2+ increased with time and temperature. Cr(VI) removal could not be described by first-order reaction kinetics, but it was well represented as a pseudo second-order reaction. The apparent rate constants at 10, 30, and 60°C were 0.9×10-3, 1.2×10-3, and 2.2×10-3gmmol-1min-1, respectively, and the apparent activation energy was 14.5kJmol-1. This value confirms that the rate-determining step for Cr(VI) removal is chemical adsorption involving the anion exchange of Cr2O72- with intercalated Cl- and the adsorption of Cr2O72- on the surface of the produced FeO(OH).

KW - Cr(VI)

KW - Doping

KW - Fe

KW - Kinetics

KW - Layered double hydroxide

KW - Removal

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