Biosorption of uranium(VI) and thorium(IV) from aqueous solution by marine Sargassum aquifolium macroalgae

Mohammad Albayari, Norazzizi Nordin*, Rohana Adnan, Fawwaz Khalili, Mazen Nazal

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Both the aquatic ecosystem and human health are at risk from radioactive elements like uranium(VI) (U(VI)) and thorium(IV) (Th(IV)). Therefore, their elimination and removal from water is of vital importance. In this study, Sargassum aquifolium macroalgae (SAM) powder was used to remove U(VI) and Th(IV) ions from aqueous solution as a new, inexpensive, and readily available biosorbent. The prepared SAM was characterized using several instruments including FTIR, XRD, TGA, and SEM-EDXS. To evaluate the sorption performance, five operating conditions were investigated, namely, solution pH, sorbent mass, contact time, metal concentration, and temperature using the batch technique. The pseudo second order equation adequately describes the sorption of U(VI) and Th(IV) ions by SAM sorbents, according to sorption kinetic studies. The sorption isotherm results corresponded well with the Langmuir sorption model, with U(VI) and Th(IV) having maximal sorption capacities of 20.4 mg g−1 and 24.1 mg g−1, respectively. Parameters of thermodynamics indicated that the sorption of U(VI) and Th(IV) ions onto SAM is possible, spontaneous, exothermic, and entropy-driven. According to desorption tests, the most effective desorption reagent for both metal cations is 0.1 mol L−1 HNO3. This research has shown that the treated SAM sorbent has high efficiency in the removal of U(VI) and Th(IV) ions from real wastewater samples.

Original languageEnglish
JournalBiomass Conversion and Biorefinery
StateAccepted/In press - 2023

Bibliographical note

Publisher Copyright:
© 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.


  • Aquifolium
  • Desorption
  • Kinetic
  • Sargassum
  • Sorption
  • Thermodynamics

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment


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