Adsorption Isotherms and Kinetics of Acebutolol and Metoprolol on Magnetic Nanocomposite Fe3O4@MIL-101(Cr)

Ngwako Joseas Waleng, Shirley Kholofelo Selahle, Silindokuhle Jakavula, Azile Nqombolo, Anele Mpupa, Yongjun Zhang, Philiswa Nosizo Nomngongo

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


Contamination of water bodies by emerging pollutants such as β-blockers has been a global concern over the past few years. This is due to the bioaccumulative character of β-blockers in the aquatic systems, and their excessive usage might cause adverse effects on both humans and aquatic biota. A reusable and recyclable magnetic chromium-based MIL-101 (Fe3O4@MIL-101(Cr)) nanocomposite was used as an adsorbent for the removal of the selected β-blockers (acebutolol and metoprolol) from wastewater. The nanocomposite‘s structural, magnetic and surface properties were confirmed using various characterisation techniques. The equilibrium data indicated that the maximum adsorption capacities of Fe3O4@MIL-101(Cr) for acebutolol and metoprolol were 30.9 mg g−1 and 28.3 mg g−1, respectively. The isotherm and kinetic experimental data best fitted Langmuir isotherm and pseudo-second-order kinetics models. Obtained free energies using the Dubinin-Radushkevich model were above 8 kJ mol−1, demonstrating that the interaction mechanism between β-blockers and the Fe3O4@MIL-101(Cr) nanocomposite was chemisorption. The prepared nanocomposite was then used to remove β-blockers from real samples, and maximum removal efficiencies (94.1–97.1 %) were obtained in the presence of co-existing species. The Fe3O4@MIL-101(Cr) hybrid showed great potential for efficient and facile removal of β-blockers from river water, effluent and influent wastewater samples.

Original languageEnglish
Article numbere202302466
Issue number48
Publication statusPublished - 22 Dec 2023


  • Adsorption
  • Central composite design
  • Metal-organic frameworks
  • Wastewate
  • β-blockers

ASJC Scopus subject areas

  • General Chemistry


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