Key factors for optimum performance in phosphate removal from contaminated water by a Fe-Mg-La tri-metal composite sorbent

Yang Yu, J. Paul Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

61 Scopus citations

Abstract

Eutrophication is typically due to excessive discharge of phosphate-containing wastewater into natural waters. In this study, a novel Fe-Mg-La trimetal composite sorbent with a Fe:Mg:La molar ratio of 2:1:1 was developed through a cost-effective co-precipitation approach for phosphate removal in contaminated water. It was found that the adsorption was greatly affected by solution pH. The experimental data was better described by Langmuir isotherm model, and the maximum adsorption capacity of 415.2. mg-P/g was achieved under pH 6.0, much higher than most of sorbents previously reported. Nitrate, sulfate, bicarbonate, fluoride and humic acid widely exist in natural water, and their presences would slightly retard the adsorption of phosphate. The adsorption kinetics experiment showed that most of adsorption occurred in the first 1. h and the adsorption equilibrium was achieved in 10. h; the adsorption history was well described by the intraparticle diffusion model. The performance of sorbent was further confirmed by treating phosphate contaminated lake water. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) analysis indicated that hydroxyl group on the sorbent surface (M-OH) played the most key role in the phosphate adsorption. The presence of sulfate group was important in the uptake as well.

Original languageEnglish
Pages (from-to)303-311
Number of pages9
JournalJournal of Colloid and Interface Science
Volume445
DOIs
StatePublished - 1 May 2015
Externally publishedYes

Keywords

  • Adsorption
  • Eutrophication
  • Hydroxyl group
  • Iron-Magnesium-Lanthanum trimetal composite sorbent
  • Natural water
  • Phosphate
  • Sulfate group

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