Sorption potential of impregnated charcoal for removal of heavy metals from phosphoric acid

J Hazard Mater. 2009 Jun 15;165(1-3):623-9. doi: 10.1016/j.jhazmat.2008.10.037. Epub 2008 Oct 18.

Abstract

The viability of some heavy ions removal from phosphoric acid solution by means of impregnated charcoal with triphenylphosphine sulphide extractant has been demonstrated in this work. Factors affecting removal of Cu(2+), Cd(2+), Zn(2+)and Pb(2+) include initial concentration of ions, volume of the aqueous solution to weight of adsorbent ratio (V/m), concentration of the extractant loaded onto charcoal and temperature. The removal percent of these ions is increased by decreasing values of V/m ratio and increasing temperature for all ions. The sorption isotherms data fit Langmuir, Freundlich and Dubinin-Radushkviech (D-R) models. The values of the mean free energy, E(a), of sorption is in all cases in the range 9.1-25.6 kJ/mol, which are within the ranges of chemical sorption reaction. The sorption reaction was found to obey a pseudo second-order rate model.

MeSH terms

  • Adsorption
  • Charcoal
  • Indicators and Reagents
  • Metals, Heavy / isolation & purification*
  • Phosphoric Acids / chemistry*
  • Solutions
  • Temperature
  • Thermodynamics

Substances

  • Indicators and Reagents
  • Metals, Heavy
  • Phosphoric Acids
  • Solutions
  • Charcoal
  • phosphoric acid