Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by ion exchange

Ruey Shin Juang; Su Hsia Lin; Hsiang Chien Kao; Ming Huei Theng

doi:10.1016/j.chemosphere.2004.11.074

Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by ion exchange

Ruey Shin Juang^*, Su Hsia Lin, Hsiang Chien Kao, Ming Huei Theng

^*Corresponding author for this work

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

9 Scopus citations

Abstract

The effect of formaldehyde (HCHO) on the ion exchange of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H₄L) solution with a strong-base Amberlite IRA-400 resin was studied. Experiments were conducted as a function of the initial concentration of Cu(II) (0.5-10 mM), solution pH (1.0-6.0), HCHO concentration (0-6 vol%), and temperature (15-35°C). It was shown that the amount of exchange of Cu(II), which exists in the form of complexed anions CuL^2-, increased with increasing solution pH and reached a plateau at an equilibrium pH (pH_e) of 3.5. However, the amount of exchange decreased with increasing HCHO concentration up to 3 vol% but then slightly decreased with a further increase in HCHO concentration. Such effect of added HCHO was determined by the following two factors: the competitive exchange of HCOO^- anions and the enhanced exchange of Cu(I) in the form of complexed anions CuL^3-. The exchange isotherm obtained at a fixed pH_e could be well described by the Langmuir equation. The isosteric enthalpy change for the present ion exchange process was also evaluated and discussed.

Original language	English
Pages (from-to)	1355-1360
Number of pages	6
Journal	Chemosphere
Volume	59
Issue number	9
DOIs	https://doi.org/10.1016/j.chemosphere.2004.11.074
State	Published - 06 2005
Externally published	Yes

Keywords

Complexed solutions
Copper(II)
EDTA
Equilibrium
Formaldehyde
Ion exchange

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10.1016/j.chemosphere.2004.11.074

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title = "Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by ion exchange",

abstract = "The effect of formaldehyde (HCHO) on the ion exchange of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H4L) solution with a strong-base Amberlite IRA-400 resin was studied. Experiments were conducted as a function of the initial concentration of Cu(II) (0.5-10 mM), solution pH (1.0-6.0), HCHO concentration (0-6 vol%), and temperature (15-35°C). It was shown that the amount of exchange of Cu(II), which exists in the form of complexed anions CuL2-, increased with increasing solution pH and reached a plateau at an equilibrium pH (pHe) of 3.5. However, the amount of exchange decreased with increasing HCHO concentration up to 3 vol% but then slightly decreased with a further increase in HCHO concentration. Such effect of added HCHO was determined by the following two factors: the competitive exchange of HCOO- anions and the enhanced exchange of Cu(I) in the form of complexed anions CuL3-. The exchange isotherm obtained at a fixed pHe could be well described by the Langmuir equation. The isosteric enthalpy change for the present ion exchange process was also evaluated and discussed.",

keywords = "Complexed solutions, Copper(II), EDTA, Equilibrium, Formaldehyde, Ion exchange",

author = "Juang, {Ruey Shin} and Lin, {Su Hsia} and Kao, {Hsiang Chien} and Theng, {Ming Huei}",

year = "2005",

month = jun,

doi = "10.1016/j.chemosphere.2004.11.074",

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TY - JOUR

T1 - Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by ion exchange

AU - Juang, Ruey Shin

AU - Lin, Su Hsia

AU - Kao, Hsiang Chien

AU - Theng, Ming Huei

PY - 2005/6

Y1 - 2005/6

N2 - The effect of formaldehyde (HCHO) on the ion exchange of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H4L) solution with a strong-base Amberlite IRA-400 resin was studied. Experiments were conducted as a function of the initial concentration of Cu(II) (0.5-10 mM), solution pH (1.0-6.0), HCHO concentration (0-6 vol%), and temperature (15-35°C). It was shown that the amount of exchange of Cu(II), which exists in the form of complexed anions CuL2-, increased with increasing solution pH and reached a plateau at an equilibrium pH (pHe) of 3.5. However, the amount of exchange decreased with increasing HCHO concentration up to 3 vol% but then slightly decreased with a further increase in HCHO concentration. Such effect of added HCHO was determined by the following two factors: the competitive exchange of HCOO- anions and the enhanced exchange of Cu(I) in the form of complexed anions CuL3-. The exchange isotherm obtained at a fixed pHe could be well described by the Langmuir equation. The isosteric enthalpy change for the present ion exchange process was also evaluated and discussed.

AB - The effect of formaldehyde (HCHO) on the ion exchange of Cu(II) from an equimolar EDTA (ethylenediaminetetraacetic acid, H4L) solution with a strong-base Amberlite IRA-400 resin was studied. Experiments were conducted as a function of the initial concentration of Cu(II) (0.5-10 mM), solution pH (1.0-6.0), HCHO concentration (0-6 vol%), and temperature (15-35°C). It was shown that the amount of exchange of Cu(II), which exists in the form of complexed anions CuL2-, increased with increasing solution pH and reached a plateau at an equilibrium pH (pHe) of 3.5. However, the amount of exchange decreased with increasing HCHO concentration up to 3 vol% but then slightly decreased with a further increase in HCHO concentration. Such effect of added HCHO was determined by the following two factors: the competitive exchange of HCOO- anions and the enhanced exchange of Cu(I) in the form of complexed anions CuL3-. The exchange isotherm obtained at a fixed pHe could be well described by the Langmuir equation. The isosteric enthalpy change for the present ion exchange process was also evaluated and discussed.

KW - Complexed solutions

KW - Copper(II)

KW - EDTA

KW - Equilibrium

KW - Formaldehyde

KW - Ion exchange

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DO - 10.1016/j.chemosphere.2004.11.074

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JO - Chemosphere

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ER -

Effect of formaldehyde on Cu(II) removal from synthetic complexed solutions by ion exchange

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