Modification of carbon derived from Sargassum sp. by lanthanum for enhanced adsorption of fluoride

Yang Yu, Chenghong Wang, Xue Guo, J. Paul Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

62 Scopus citations

Abstract

Excessive fluoride in water causes serious environmental issues and adverse impacts on human health. In this study, an innovative lanthanum-modified carbon (LMC) adsorbent rooted in Sargassum sp. was developed for fluoride removal. Excellent removal efficiency was observed over a wide pH range of 3-9. Almost 90% of fluoride adsorption occurred within the first 1h; the equilibrium was established within 4h. The maximum adsorption capacity of LMC could reach 94.34mg/g at neutral pH, much higher than many commercial adsorbents. Although the presence of such competitive anions as SiO32-, SO42-, HCO3-, PO43- and AsO3- had certain interference on fluoride uptake, it was noticed that there was no significant impact in the presence of humic acid. Furthermore, according to the instrumental analysis, the fluoride removal was majorly controlled by outer-sphere complex adsorption, while electrostatic attraction and ion exchange mechanisms could also be observed in the fluoride adsorption process. The findings from this study suggest that our adsorbent may have a great potential in industrial applications.

Original languageEnglish
Pages (from-to)113-120
Number of pages8
JournalJournal of Colloid and Interface Science
Volume441
DOIs
StatePublished - 1 Mar 2015
Externally publishedYes

Keywords

  • Adsorption
  • Defluoridation
  • Fluoride
  • Lanthanum modified carbon adsorbent
  • Sargassum sp.

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