Sorption of precious metals onto chemically prepared carbon from flax shive

M. Cox*, A. A. Pichugin, E. I. El-Shafey, Q. Appleton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

56 Citations (SciVal)


The sorption of gold, silver, palladium and platinum chlorides onto a carbonaceous sorbent prepared from flax shive by treatment with hot sulfuric acid is described. The results showed that the rate of sorption followed a first-order relationship with the initial rate described largely by pore diffusion. The sorption of the metal ions followed the Langmuir equation with the calculated monolayer capacities following the order: Au(III)>Pd(II) >Ag(I)>Pt(II)≈ Pt(IV). The sorption process was shown to occur by ion exchange reactions with functional groups on the sorbent. Once the metal ions had been loaded onto the sorbent, they were, except for platinum(IV), reduced by the sorbent to the metal with oxidation of the sorbent generating further ion exchange sites for sorption of the metal ions. This allowed the possibility of recycling the sorbent until significant amounts of the precious metal had been accumulated, thus simplifying the recovery of the metal by combustion of the residual sorbent.

Original languageEnglish
Pages (from-to)137-144
Number of pages8
Issue number1-2 SPEC. ISS.
Publication statusPublished - Jul 2005
Externally publishedYes


  • Adsorption
  • Carbonaceous sorbent
  • Flax
  • Kinetics
  • Precious metals
  • Redox

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry


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