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Isotherm and kinetic studies on the adsorption of humic acid molecular size fractions onto clay minerals

  • Mohamed E. A. El-SayedEmail author
  • Moustafa M. R. Khalaf
  • James A. Rice
Original Article
  • 6 Downloads

Abstract

Humic acid (HA) can adsorb onto mineral surfaces, modifying the physicochemical properties of the mineral. Therefore, understanding the sorption behavior of HA onto mineral surfaces is of particular interest, since the fate and transport of many organic and inorganic contaminants are highly correlated to HA adsorbed onto clay surfaces. Due to the extreme heterogeneity of HA, the extracted IHSS Leonardite humic acid (LHA) used in this work was fractionated using an ultrafiltration technique (UF) into different molecular size fractions (Fr1, > 0.2 µm; Fr2, 0.2 µm–300,000 daltons; Fr3, 300,000–50,000 daltons; Fr4, 50,000–10,000 daltons; Fr5, 10,000–1000 daltons). Equilibrium and the kinetics of LHA and fraction adsorption onto kaolinite and montmorillonite were investigated. The results demonstrated that the maximum adsorption capacity of LHA, Fr1, Fr2, Fr3, Fr4, and Fr5 was 5.99, 13.69, 10.29, 7.02, 5.98, and 5.09 on kaolinite while it was 8.29, 22.62, 13.17, 8.91, 8.62, and 5.69 on montmorillonite, respectively. The adsorption equilibrium data showed that the adsorption behavior of LHA and its fractions could be described more practically by the Langmuir model than the Freundlich model. The rate of humic acid fraction adsorption onto clays increased with decreasing molecular size fraction and increasing carboxylic group content. Pseudo-first- and second-order models were used to assess the kinetic data and the rate constants. The results explained that LHA and its fractions adsorption on clay minerals conformed more to pseudo-second-order.

Keywords

Kaolinite Montmorillonite Leonardite humic acid Humic acid fractions Kinetics Equilibrium 

Notes

Acknowledgements

This work was funded by a Fulbright Visiting Scholar fellowship to Mohamed El-sayed and performed at South Dakota State University.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Science Press and Institute of Geochemistry, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Mohamed E. A. El-Sayed
    • 1
    • 2
    Email author
  • Moustafa M. R. Khalaf
    • 1
    • 3
  • James A. Rice
    • 1
  1. 1.Department of Chemistry and BiochemistrySouth Dakota State UniversityBrookingsUSA
  2. 2.Soils, Water, and Environmental Research InstituteAgriculture Research CenterEl-GizaEgypt
  3. 3.Chemistry Department, Faculty of ScienceMinia UniversityEl-MiniaEgypt

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