Characteristics of adsorption interactions of cadmium(II) onto humin from peat soil in freshwater and seawater media

Roy Andreas; Jing Zhang

doi:10.1007/s00128-014-1205-x

Characteristics of adsorption interactions of cadmium(II) onto humin from peat soil in freshwater and seawater media

Roy Andreas, Jing Zhang^*

^*Corresponding author for this work

Department of Natural and Environmental Science

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

31 Scopus citations

Abstract

The present study examined Cd solubility in pH 2-12 fresh and seawater media with and without humin to determine Cd species composition. The study, based on the Langmuir-Hinshelwood kinetics model, was conducted to determine the kinetic parameters of Cd(II) adsorption onto humin. We employed the Langmuir and Freundlich models to derive thermodynamic parameters. Aquo (Cd(H ₂O) ₆ ²⁺) and chloro- (CdCl⁺ and CdCl₂) complexes were responsible for Cd(II) adsorption onto humin. Results showed Cd as Cd(II) and Cd(H₂O) ₆ ⁺² was water soluble at 2 < pH < 7; with a portion of the soluble Cd precipitating as Cd(OH)₂. The Cd(II) rate constant (k) in freshwater was 0.5 × 10^-3 (min^-1), occurring in a single phase, while in seawater fast and slow phase values for k were 31.88 × 10 ^-3 and 6.2 × 10^-3 (min^-1), respectively. The adsorption curves showed a better fit with the Langmuir than the Freundlich model.

Original language	English
Pages (from-to)	352-357
Number of pages	6
Journal	Bulletin of Environmental Contamination and Toxicology
Volume	92
Issue number	3
DOIs	https://doi.org/10.1007/s00128-014-1205-x
State	Published - 2014/03

Keywords

Cadmium (II)
Freshwater media
Humin
Seawater media

ASJC Scopus subject areas

Toxicology
Pollution
Health, Toxicology and Mutagenesis

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10.1007/s00128-014-1205-x

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title = "Characteristics of adsorption interactions of cadmium(II) onto humin from peat soil in freshwater and seawater media",

abstract = "The present study examined Cd solubility in pH 2-12 fresh and seawater media with and without humin to determine Cd species composition. The study, based on the Langmuir-Hinshelwood kinetics model, was conducted to determine the kinetic parameters of Cd(II) adsorption onto humin. We employed the Langmuir and Freundlich models to derive thermodynamic parameters. Aquo (Cd(H 2O) 6 2+) and chloro- (CdCl+ and CdCl2) complexes were responsible for Cd(II) adsorption onto humin. Results showed Cd as Cd(II) and Cd(H2O) 6 +2 was water soluble at 2 < pH < 7; with a portion of the soluble Cd precipitating as Cd(OH)2. The Cd(II) rate constant (k) in freshwater was 0.5 × 10-3 (min-1), occurring in a single phase, while in seawater fast and slow phase values for k were 31.88 × 10 -3 and 6.2 × 10-3 (min-1), respectively. The adsorption curves showed a better fit with the Langmuir than the Freundlich model.",

keywords = "Cadmium (II), Freshwater media, Humin, Seawater media",

author = "Roy Andreas and Jing Zhang",

year = "2014",

month = mar,

doi = "10.1007/s00128-014-1205-x",

language = "英語",

volume = "92",

pages = "352--357",

journal = "Bulletin of Environmental Contamination and Toxicology",

issn = "0007-4861",

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T1 - Characteristics of adsorption interactions of cadmium(II) onto humin from peat soil in freshwater and seawater media

AU - Andreas, Roy

AU - Zhang, Jing

PY - 2014/3

Y1 - 2014/3

N2 - The present study examined Cd solubility in pH 2-12 fresh and seawater media with and without humin to determine Cd species composition. The study, based on the Langmuir-Hinshelwood kinetics model, was conducted to determine the kinetic parameters of Cd(II) adsorption onto humin. We employed the Langmuir and Freundlich models to derive thermodynamic parameters. Aquo (Cd(H 2O) 6 2+) and chloro- (CdCl+ and CdCl2) complexes were responsible for Cd(II) adsorption onto humin. Results showed Cd as Cd(II) and Cd(H2O) 6 +2 was water soluble at 2 < pH < 7; with a portion of the soluble Cd precipitating as Cd(OH)2. The Cd(II) rate constant (k) in freshwater was 0.5 × 10-3 (min-1), occurring in a single phase, while in seawater fast and slow phase values for k were 31.88 × 10 -3 and 6.2 × 10-3 (min-1), respectively. The adsorption curves showed a better fit with the Langmuir than the Freundlich model.

AB - The present study examined Cd solubility in pH 2-12 fresh and seawater media with and without humin to determine Cd species composition. The study, based on the Langmuir-Hinshelwood kinetics model, was conducted to determine the kinetic parameters of Cd(II) adsorption onto humin. We employed the Langmuir and Freundlich models to derive thermodynamic parameters. Aquo (Cd(H 2O) 6 2+) and chloro- (CdCl+ and CdCl2) complexes were responsible for Cd(II) adsorption onto humin. Results showed Cd as Cd(II) and Cd(H2O) 6 +2 was water soluble at 2 < pH < 7; with a portion of the soluble Cd precipitating as Cd(OH)2. The Cd(II) rate constant (k) in freshwater was 0.5 × 10-3 (min-1), occurring in a single phase, while in seawater fast and slow phase values for k were 31.88 × 10 -3 and 6.2 × 10-3 (min-1), respectively. The adsorption curves showed a better fit with the Langmuir than the Freundlich model.

KW - Cadmium (II)

KW - Freshwater media

KW - Humin

KW - Seawater media

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U2 - 10.1007/s00128-014-1205-x

DO - 10.1007/s00128-014-1205-x

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AN - SCOPUS:84894316028

SN - 0007-4861

VL - 92

SP - 352

EP - 357

JO - Bulletin of Environmental Contamination and Toxicology

JF - Bulletin of Environmental Contamination and Toxicology

IS - 3

ER -

Characteristics of adsorption interactions of cadmium(II) onto humin from peat soil in freshwater and seawater media

Abstract

Keywords

ASJC Scopus subject areas

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