Removal of Zn(II) from Aqueous Acetate Solution Using Di (2-Ethylhexyl) Phosphoric Acid & Tributylphosphate (original) (raw)

Abstract

The extraction of Zinc (II) in acetate medium with di (2-ethylhexyl) phosphoric acid (D2EHPA) in chloroform diluent was investigated under different experimental conditions, in order to have a better understanding of the extraction mechanism. The extraction yield was found to depend on the concentrations of Zinc (II) and D2EHPA, and the equilibrium pH. The effects of acetic acid and the salting-out agent were also studied. The nature of the extracted species was investigated by the slope analysis method. Graphs of log D vs. log [D2EHPA] and log D vs. pH were plotted for Zn (II), and the species extracted into the organic phase was found to have the composition (ZnCH 3 COO)R.HR. The best performance was reached (80%) with zinc concentrations lower than 5 mM in a neutral medium. The extraction yield of metals decreased as the acetic acid concentration increased with any given extractant concentration. The addition of sodium acetate to the aqueous phase strongly increased the zinc extraction yield (99.5%). A synergistic effect was observed by the addition of tributhylphosphate (TBP) with the organic phase.

Loading...

Loading Preview

Sorry, preview is currently unavailable. You can download the paper by clicking the button above.

References (22)

  1. Alamdari, E. K., Moradkhani, D., Darvish, D., Askari, M.,  Behnian, D. (2004). Synergistic effect of MEHPA on co-extraction of zinc and cadmium with DEHPA. J. Miner. Eng., 17, 89-92. http://dx.doi.org/10.1016/j.mineng.2003.10.003
  2. Alamdari, E. K., Darvishi, D., Sadrnezhaad, S. K., Shabestari, Z. M., O'hadizadeh, A.,  Akbari, M. (2002). Effect of TBP as a modifier for extraction of zinc and cadmium with a mixture of DEHPA and MEHPA. In: Sole, K. C., Cole, P. M., Preston, J. S., Robinson, D. J. (Eds.). Proc. Int. Conf. Solvent Extraction Conference. S. Afr. Inst. Min & Metall., Johannesburg, 1, 1052-1057.
  3. Belkhouche, N., & Didi, M. A. (2010). Extraction of Bi(III) from nitrate medium by D2EHPA impregnated onto Amberlite XAD-1180. Hydrometallurgy, 103, 60-67. http://dx.doi.org/10.1016/j.hydromet.2010.02.015.
  4. Dayrell Pereira, D., Denise Ferreira Rocha, S.,  Mansur, M. B. (2007). Recovery of zinc sulphate from industrial effluents by liquid-liquid extraction using D2EHPA (di-2-ethylhexyl phosphoric acid). J. Sep. Purif. Technol., 53, 89-96. http://dx.doi.org/10.1016/j.seppur.2006.06.013
  5. Eivazi, A. R. H., Moradkhani, D., Alamdari, E. K.,  Darvishi, D. (2008). Solvent extraction separation of zinc, manganese and cobalt in sulfate solutions by D2EHPA. In: Moyer, B.A. (Ed.), Proc. Int. Solvent Extraction Conference, Tucson. Canadian Inst. Min. & Metall., Montreal, I, pp. 233-238.
  6. Haghshenas Fatmehsari, D., Darvishi, D., Etemadi, S., Eivazi Hollagh, A. R., Keshavarz Alamdari, E.,  Salardini, A. A. (2009). Interaction between TBP and D2EHPA during Zn, Cd, Mn, Cu, Co and Ni solvent extraction: A thermodynamic and empirical approach. J. Hydrometallurgy, 98, 143-147. http://dx.doi.org/10.1016/j.hydromet.2009.04.010
  7. Jain, C. K., Singhal, D. C.,  Sharma, M. K. (2004). Adsorption of zinc on bed sediment of river Hindon: adsorption models and kinetics. J. Hazard. Mater. B, 114, 231-239. http://dx.doi.org/10.1016/j.jhazmat.2004.09.001
  8. Kraikaew, J., Srinuttrakul, W., & Chayavadhanakur, C. (2005). Solvent extraction study of rare earths from nitrate medium by the mixtures of TBP and D2EHPA in kerosene. J. Met. Mat. Min., 15(2), 89-95. http://dx.doi.org/10.1016/s1002-0721(10)606 01-1
  9. Krea, M.,  Khalaf, H. (2000). Liquid-liquid extraction of uranium and Lanthanide From Phosphoric Acid Using A Synergistic DOPP-TOPO Mixture. J. Hydrometallurgy, 58, 215-225. http://dx.doi.org/10.1016/ S0304-386X(00)00129-8
  10. Mansur, M. B., Slater, M. J.,  Biscaia, E. C. (2002). Kinetic analysis of the liquid-liquid test system ZnSO4/D2EHPA/n-heptane. J. Hydrometallurgy, 63, 107-116. http://dx.doi.org/10.1016/S0304-386X(01) 00210-9
  11. Mansur, M. B., Slater, M. J.,  Biscaia, E. C. (2002). Equilibrium analysis of the reactive liquid-liquid test system ZnSO4/D2EHPA/n-heptane. J. Hydrometallurgy, 63, 117-126. http://dx.doi.org/ 10.1016/S0304-386X(01) 00211-0
  12. Matsui, M., Hirade, T.,  Shigematsu, T. (1979). Nonaqueous Liquid-Liquid Extraction. Extraction of Zinc from Methanol Water Solution of Chloride by Trioctylphosphine Oxide in Decaline. Anal. Lett., 12, 1385-1397. http://dx.doi.org/10.1080/00032717908067928
  13. Mellah, A.,  Benachour, D. (2006). The solvent extraction of zinc and cadmium from phosphoric acid solution by di-2-ethyl hexyl phosphoric acid in kerosene diluents. J. Chem. Eng. Process., 45, 684-690. http://dx.doi.org/10.1016/j.cep.2006.02.004
  14. Miralles, N., Sastre, A. M., Aguilar, M.,  Cox, M. (1992). Solvent extraction of zinc (II) by organophosphorus acids compounds from perchlorate solutions. Solvent Extr. Ion Exc., 10(1), 51-68. http://dx.doi.org/10.1080/ 07366299208918092
  15. Raman, B.,  Shinde, V. M. (1989). Extraction and determination of zinc in pharmaceutical samples. Talanta, 36, 469. http://dx.doi.org/10.1016/0039-9140(89)80230-9
  16. Reynier, N., Dozol, J. F., Saadioui, M., Asfari, Z.,  Vicens, J. (1998). Complexation properties of a new photosensitive calix[4]arene crown ether containing azo unit in the lower rim towards alkali cations. Tetrahedron Let., 39, 6461-6464. http://dx.doi.org/10.1016/S0040-4039(98)00678-9
  17. Ritcey, G. M.,  Ashbrook, A. W. (1979). Solvent Extraction, 2, Ed. Elsevier Scientific Publishing Company, Amesterdam, Netherlands 167.
  18. Rocca, J. L.,  Porthault, M. (1971). Etude de l'extraction liquide-liquide du Zinc(II) et du Cadmium(II) par l'oxyde de (Carboxy-2-ethyl)diphenyl-phosphine en solution dans le chloroforme. Anal. Chim. Acta., 55, 341-348. http://dx.doi.org/10.1016/S0003-2670(01)82386-2
  19. Shiri-Yekta, Z., Zamani, A. A.,  Yaftian, M. R. (2009). Amelioration of extraction-separation efficiency of Zn(II), Cd(II) and Pb(II) ions with bis(2-ethylhexyl)phosphoric acid in the presence of a water-soluble N4-type Schiff base ligand. J. Sep. Purif. Technol., 66, 98-103. http://dx.doi.org/10.1016/ j.seppur.2008.11.015
  20. Singh, D., Singh, O. V.,  Tandon, S. N. (1980). Extraction of zinc thiocyanate complex by tributyl phosphate in benzene. J. Anal. Chim. Acta., 115, 369-372. http://dx.doi.org/10.1016/S0003-2670(01)93180-0
  21. Veli, S.,  Alyuz, B. (2007). Adsorption of copper and zinc from aqueous solutions by using natural clay, J. Hazard. Mater., 149, 226-233. http://dx.doi.org/10.1016/j.jhazmat.2007.04.109
  22. Yun, S. S. (1985). The thermodynamics of synergistic solvent extraction of Zn (II) with 1- phenyl-3-methyl-4-benzoyl-pyrazole-5-one. Polyhedron, 4, 1865-1868. http://dx.doi.org/10.1016/ S0277- 5387(00)86702-9