Parameters Affecting the Removal of Copper and Cobalt from Aqueous Solution onto Clinoptiloliteby Ion-Exchange Process

Authors: John Kabuba, Hilary Rutto

Abstract:

Ion exchange is one of the methods used to remove heavy metal such as copper and cobalt from wastewaters. Parameters affecting the ion-exchange of copper and cobalt aqueous solutions using clinoptilolite are the objectives of this study. Synthetic solutions were prepared with the concentration of 0.02M, 0.06M and 0.1M. The cobalt solution was maintained to 0.02M while varying the copper solution to the above stated concentrations. The clinoptilolite was activated with HCl and H₂SO₄ for removal efficiency. The pHs of the solutions were found to be acidic hence enhancing the copper and cobalt removal. The natural clinoptilolite performance was also found to be lower compared to the HCl and H₂SO₄ activated one for the copper removal ranging from 68% to 78% of Cu²⁺ uptake with the natural clinoptilolite to 66% to 51% with HCl and H₂SO₄ respectively. It was found that the activated clinoptilolite removed more copper and cobalt than the natural one and found that the electronegativity of the metal plays a role in the metal removal and the clinoptilolite selectivity.

Keywords: Clinoptilolite, cobalt and copper, Ion-exchange, mass dosage, pH.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1094605

References:

[1] R.E. Clement,G.A. Eiceman, C.J. Koester, "Environmental analysis”. J. Anal. Chem. 1995, vol.67,pp.221-255.
[2] E. Muzenda, J. Kabuba,F. Ntuli, M. Mollagee and A.F. Mulaba-Bafubiandi, "Cu (II) Removal from Synthetic Waste Water by Ion Exchange Process”, Proceedings of the WCECS, vol. II, 2011, Oct. 19-21, San Francisco, USA.
[3] S.A. Abdulkareen, E. Muzenda, A.S. Afolabi , J. Kabuba, " Treatment of clinoptilolite as an Adsorbent for the Removal of copper Ion from Synthetic Wastewater solution”, Arab. J. Sci. Eng., 2013, vol. 38, pp. 2263-2272.
[4] A. Thanasiadis, B. Helmreich , "Influence of chemical conditioning of the ion-exchange capacity and onnatural silicate minerals”,J. Clay Miner., 2005, vol. 38, pp. 501-509.
[5] M. Kormaz, C. Ozmetin, B. Ali Fil, Y. Yasar,"Determination of Parameters Affecting Copper Removal from Solution by Clinoptilolite: Adsorption Isotherm and Thermodynamic”,Igdir Univ. J. Inst. Sci& Tech. 2012, vol. 3, pp. 47-54
[6] V.J. Inglezakis, A.A. Zorpas, M.D. Loizidou and H.P. Grigolopoulou, "The effects of competitive cations and anions on ion exchange of heavy metals”, Separation Purification Technology, 2005, vol. 46, pp. 202-207.
[7] J. Kabuba , A.F. Mulaba-Bafubiandi, K. Battle,"A critical study of Neural networks Applied to ion-exchange Process”,World Academy of Science, Engineering and Technology, 2012, vol. 68, pp. 1226-1229.
[8] M.A. Kuronem, A. Weller, "Ion exchange selectivity and structural changes in highly aluminous zeolite”, React. Funct., 2006, vol. 66, pp. 1350-1361.
[9] K.S. Hui, C.Y.H. Chao, S.C. Koi, " Removal of heavy metal ions in wastewater by zeolite 4A and residual product from recycled coal fly ash”,J. Hazard. Mat., 2005, vol. B127, pp. 89-101.
[10] B.B. Mamba, D.W. Nyembe and A.F. Mulala-Bafubiandi, "The effects of conditioning withNaCl, KCl and HCl on the performance of natural clinoptilolite’s removal efficiency of Cu2+ and Co2+ from Co/Cu synthetic solutions”, Water SA,2009, vol. 36, pp. 437-444
[11] A. Yorukoglu, "Influence of acid activation on the ion-exchange properties of the Manisa-gordesclinoptilolite”, Physicochemical problems of mineral processing, 2012, vol. 48, pp. 591-598.