Cited by 186Adsorption and biosorption for pollutant removalEnvironmental remediation with nanomaterialsCoagulation and Flocculation Studies

Comparative adsorption mechanism of doxycycline and Congo red using synthesized kaolinite supported CoFe2O4 nanoparticles

Olusegun, Sunday J., Mohallem, Nelcy D.S.·2020·Environmental Pollution

Abstract

Kaolinite supported CoFe 2 O 4 (KCF) was synthesized and employed to adsorb doxycycline (DOX), an antibiotic and Congo red (CR), a dye from aqueous solution. The prepared KCF nanocomposite was treated in a muffle furnace at 300, 500 and 700 °C, and thereafter characterized. X-ray diffractogram revealed structural damage of kaolinite and appearance of distinct peaks of CoFe 2 O 4 with an increase in calcination temperature, while transmission electron microscopy (TEM) images showed that CoFe 2 O 4 nanoparticles were supported on the lamellar surface of kaolinites. Comparative adsorption mechanism of the two targeted contaminants showed that adsorption of DOX was influenced by hydrogen bond and n-π interaction, while that of CR was due to hydrophobic interaction and hydrogen bond. However, the adsorption of the two contaminants was best fitted to the isotherm that was proposed by Langmuir, with a monolayer maximum adsorption capacity of 400 mg g-1 at 333 K for DOX, and 547 mg g-1 at 298 K for CR. The removal of DOX from aqueous solution was favored by an increase in temperature (endothermic), while that of CR was exothermic. Thermodynamics studies confirmed that the adsorption of the two contaminants is feasible and spontaneous. The presence of natural organic matter (NOM) did not affect the removal of the two contaminants. Regeneration and reusability study showed that KCF is economically viable. Therefore, introducing inorganic particles like cobalt ferrite into the matrix of kaolinites provides a composite with promising adsorption capacity.

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Crossref · 10.1016/j.envpol.2020.114019

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  • The negative ΔS values for both MB and CR were ascribed to the adsorbates losing randomness in the solid-solute interface during the adsorption process.

    “The negative value in both MB and CR for ΔS was ascribed to the fact that the adsorbates lose randomness in the solid-solute interface during the adsorption process47,58,79–81.”

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Authors
Olusegun, S. J., & Mohallem, N. D. S.
Affiliations
Universidade Federal de Minas Gerais (BR)
Corresponding author
Olusegun, Sunday J.
Venue
Environmental Pollution
Publisher
Elsevier BV
Published
2020-05
Volume
260
Pages
114019
ISSN
0269-7491 (ISSN-L)
OpenAlex
W3002401659
Cited by
186
References
68
Citations by year
2026: 16 · 2025: 35 · 2024: 29 · 2023: 29 · 2022: 39 · 2021: 24 · 2020: 14
FWCI
8.13
Type
journal article
Language
en
Open access
closed
Locations
  • Environmental Pollution (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico
  • The Academy of Sciences for the Developing World
  • Fundação de Amparo à Pesquisa do Estado de Minas Gerais
Topics
  • Physical Sciences › Environmental Science › Water Science and Technology › Adsorption and biosorption for pollutant removal
  • Physical Sciences › Engineering › Biomedical Engineering › Environmental remediation with nanomaterials
  • Physical Sciences › Environmental Science › Water Science and Technology › Coagulation and Flocculation Studies
Keywords
doxycycline, Congo red, kaolinite, cobalt ferrite nanoparticles, nanocomposite adsorbent, antibiotic removal, dye removal, adsorption mechanism, Langmuir isotherm, adsorption thermodynamics, calcination temperature, natural organic matter, adsorbent regeneration, wastewater treatment
MeSH terms
Adsorption, Congo Red, Doxycycline, Hydrogen-Ion Concentration, Kaolin, Kinetics, Thermodynamics, Water Pollutants, Chemical, Nanoparticles

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