Kinetics and isotherm analysis of 2,4-dichlorophenoxyl acetic acid adsorption onto soil components under oxic and anoxic conditions

Isaac A Ololade, Folasade Alomaja, Nurudeen A Oladoja, Oluwaranti O Ololade, Femi F Oloye

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

2,4-dichlorophenoxyl acetic acid (2,4-D, pKa = 2.8) is used extensively as a herbicide in agricultural practices. Its sorption behavior on both untreated and soils treated to significantly remove specific components (organic and iron and manganese [Fe-Mn] oxides and hydroxides phases) was investigated under oxic and anoxic conditions. The chemical and structural heterogeneity of the soil components were characterized by elemental analysis and X-ray diffraction (XRD). The coexistence of the various components seems to either mask sorption sites on the untreated soil surfaces or inhibit interlayer diffusion of 2,4-D. All sorption data conform to the Freundlich description and a pseudo-second-order kinetic model. There was a strong positive correlation between sorption capacity K(d), and surface area (r(2) ≤ 0.704), but a negative correlation was uncovered with both pH and organic carbon (r(2) ≤ -0.860). The results indicate that 2,4-D is preferably sorbed under oxic rather than anoxic conditions and it is greater on soils containing a high Fe content. There was incomplete 2,4-D sorption reversibility, with desorption occurring more rapidly under anoxic conditions. The study suggests that stimulation of Fe III reduction could be used for the bioremediation of a 2,4-D-contaminated site.

Original languageEnglish
Pages (from-to)492-503
Number of pages12
JournalJournal of Environmental Science and Health, Part B
Volume50
Issue number7
DOIs
Publication statusPublished - 2015

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2,4-Dichlorophenoxyacetic Acid
2,4 dichlorophenoxyacetic acid
oxic conditions
Acetic acid
anaerobic conditions
Acetic Acid
acetic acid
anoxic conditions
2,4-D
sorption
Adsorption
Isotherms
Sorption
adsorption
isotherm
Soil
Soils
kinetics
Kinetics
soil

Keywords

  • 2,4-Dichlorophenoxyacetic Acid
  • Adsorption
  • organic matter
  • Herbicide
  • Hydrogen-Ion Concentration
  • Kinetics
  • Manganese Compounds
  • Oxides
  • Soil
  • Soil components
  • X-Ray Diffraction
  • sorption
  • desorption

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Environmental Science(all)
  • Medicine(all)

Cite this

Kinetics and isotherm analysis of 2,4-dichlorophenoxyl acetic acid adsorption onto soil components under oxic and anoxic conditions. / Ololade, Isaac A; Alomaja, Folasade; Oladoja, Nurudeen A; Ololade, Oluwaranti O; Oloye, Femi F.

In: Journal of Environmental Science and Health, Part B, Vol. 50, No. 7, 2015, p. 492-503.

Research output: Contribution to journalArticle

Ololade, Isaac A ; Alomaja, Folasade ; Oladoja, Nurudeen A ; Ololade, Oluwaranti O ; Oloye, Femi F. / Kinetics and isotherm analysis of 2,4-dichlorophenoxyl acetic acid adsorption onto soil components under oxic and anoxic conditions. In: Journal of Environmental Science and Health, Part B. 2015 ; Vol. 50, No. 7. pp. 492-503.
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abstract = "2,4-dichlorophenoxyl acetic acid (2,4-D, pKa = 2.8) is used extensively as a herbicide in agricultural practices. Its sorption behavior on both untreated and soils treated to significantly remove specific components (organic and iron and manganese [Fe-Mn] oxides and hydroxides phases) was investigated under oxic and anoxic conditions. The chemical and structural heterogeneity of the soil components were characterized by elemental analysis and X-ray diffraction (XRD). The coexistence of the various components seems to either mask sorption sites on the untreated soil surfaces or inhibit interlayer diffusion of 2,4-D. All sorption data conform to the Freundlich description and a pseudo-second-order kinetic model. There was a strong positive correlation between sorption capacity K(d), and surface area (r(2) ≤ 0.704), but a negative correlation was uncovered with both pH and organic carbon (r(2) ≤ -0.860). The results indicate that 2,4-D is preferably sorbed under oxic rather than anoxic conditions and it is greater on soils containing a high Fe content. There was incomplete 2,4-D sorption reversibility, with desorption occurring more rapidly under anoxic conditions. The study suggests that stimulation of Fe III reduction could be used for the bioremediation of a 2,4-D-contaminated site.",
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T1 - Kinetics and isotherm analysis of 2,4-dichlorophenoxyl acetic acid adsorption onto soil components under oxic and anoxic conditions

AU - Ololade, Isaac A

AU - Alomaja, Folasade

AU - Oladoja, Nurudeen A

AU - Ololade, Oluwaranti O

AU - Oloye, Femi F

N1 - Acknowledgment The authors are especially thankful to Assistant Professor Ifedayo Victor Ogungbe of the Department of Chemistry and Biochemistry, Jackson State University, USA for valuable contributions.

PY - 2015

Y1 - 2015

N2 - 2,4-dichlorophenoxyl acetic acid (2,4-D, pKa = 2.8) is used extensively as a herbicide in agricultural practices. Its sorption behavior on both untreated and soils treated to significantly remove specific components (organic and iron and manganese [Fe-Mn] oxides and hydroxides phases) was investigated under oxic and anoxic conditions. The chemical and structural heterogeneity of the soil components were characterized by elemental analysis and X-ray diffraction (XRD). The coexistence of the various components seems to either mask sorption sites on the untreated soil surfaces or inhibit interlayer diffusion of 2,4-D. All sorption data conform to the Freundlich description and a pseudo-second-order kinetic model. There was a strong positive correlation between sorption capacity K(d), and surface area (r(2) ≤ 0.704), but a negative correlation was uncovered with both pH and organic carbon (r(2) ≤ -0.860). The results indicate that 2,4-D is preferably sorbed under oxic rather than anoxic conditions and it is greater on soils containing a high Fe content. There was incomplete 2,4-D sorption reversibility, with desorption occurring more rapidly under anoxic conditions. The study suggests that stimulation of Fe III reduction could be used for the bioremediation of a 2,4-D-contaminated site.

AB - 2,4-dichlorophenoxyl acetic acid (2,4-D, pKa = 2.8) is used extensively as a herbicide in agricultural practices. Its sorption behavior on both untreated and soils treated to significantly remove specific components (organic and iron and manganese [Fe-Mn] oxides and hydroxides phases) was investigated under oxic and anoxic conditions. The chemical and structural heterogeneity of the soil components were characterized by elemental analysis and X-ray diffraction (XRD). The coexistence of the various components seems to either mask sorption sites on the untreated soil surfaces or inhibit interlayer diffusion of 2,4-D. All sorption data conform to the Freundlich description and a pseudo-second-order kinetic model. There was a strong positive correlation between sorption capacity K(d), and surface area (r(2) ≤ 0.704), but a negative correlation was uncovered with both pH and organic carbon (r(2) ≤ -0.860). The results indicate that 2,4-D is preferably sorbed under oxic rather than anoxic conditions and it is greater on soils containing a high Fe content. There was incomplete 2,4-D sorption reversibility, with desorption occurring more rapidly under anoxic conditions. The study suggests that stimulation of Fe III reduction could be used for the bioremediation of a 2,4-D-contaminated site.

KW - 2,4-Dichlorophenoxyacetic Acid

KW - Adsorption

KW - organic matter

KW - Herbicide

KW - Hydrogen-Ion Concentration

KW - Kinetics

KW - Manganese Compounds

KW - Oxides

KW - Soil

KW - Soil components

KW - X-Ray Diffraction

KW - sorption

KW - desorption

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DO - 10.1080/03601234.2015.1018762

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C2 - 25996813

VL - 50

SP - 492

EP - 503

JO - Journal of Environmental Science and Health, Part B

JF - Journal of Environmental Science and Health, Part B

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