O. M. J. Yabe, E. Oliveira "Heavy metals removal in industrial effluents
by sequential adsorbent treatment", Adv. Env. Res, 7, 2003, pp. 263-272.
 K. K. Panday, G. Prasad, V. N. Singh "Copper (II) removal from aqueous solutions by fly ash", Wat. Res. Vol.19, 1985, pp.869.
 G. Blanchard, M. Maunaye, G. Martin "Removal of heavy metals from
waters by means of natural zeolites", Water Res. 18,1984, pp.1501-
 Y.S.Ho "Second-order kinetic model for the sorption of cadmium onto
tree fern: A comparison of linear and non-linear methods", Water Res.
40(1), 2006, pp. 119-125.
 H.J.M. Bowen, The Environmental Chemistry of the Elements,
Academic Press, London, 1979, pp 109-111.
 Curkovic S.; Metal ion exchange by natural and modified zeolites; Wat.
Res., vol.31, 1997, pp.1379-1382.
 D. Georgiev, B. Bogdanov, Y. Hristov, I. Markovska and I. Petrov
ÔÇ×Synthesis of NaA zeolite from natural kaolinite", 8 th International
conference on the occurrence, properties and utilization of natural
zeolites, 10-18 July 2010, Sofia, pp. 95-96.
 D. Georgiev, B. Bogdanov, Y. Hristov, I. Markovska, Iv.Petrov "NaA
zeolite synthesized in fluidized bed reactor", 15th International
Metallurgy & Materials Congress (IMMC 2010), Istambul, November
11th- 13th,2010, p.210-216.
 F. Scholz, Electroanalytical Methods, Guise to Experiments and
Applications, Springer, Moskow, 2006.
 B. Biskup, B. Suboti "Kinetic analysis of the exchange processes
between sodium ions from zeolite A and cadmium, copper and nickel
ions from solutions", Separation and Purification Technology, vol. 37,
2004, pp. 17-31.
 S. Singh et. al., "Adsorption Behaviour of Ni (II) from Water onto
Zeolite X: Kinetics and Equilibrium Studies", Proceedings of the World
Congress on Engineering and Computer Science 2008 WCECS 2008,
October 22 - 24, 2008, San Francisco, USA, ISBN: 978-988-98671-0-2,
 H. Dyer et-al, "The plotting and interpretation of ion exchange isotherms
in charcoal systems", Sep. Sci. Technol., voL16, 1981, pp. l73-183.
 S.R. Shukla, Roshan S.Pai, "Adsorption of Cu(II), Ni (II) and Zn(II) on
dye loaded groundnut shells and sawdust", Separation and purification
Technology, Vol. 43, 2005, pp. 1-8.
 J. Febrianto, A.N. Kosasiha, J. Sunarsob, Y, N. Jua,"Equilibrium and
kinetic studies in adsorption of heavy metals using biosorbent: A
summary of recent studies",J Hazard Mater, 162, 2009, pp. 616-645.
 J. Lin , Wang L.
 Comparison between linear and non-linear
forms of pseudo-first-order and pseudo-second-order adsorption kinetic
models for the removal of methylene blue by activated carbon. Environ
 Ho YS, Ng JCP, McKay G (2001). Removal of Lead (II) from Effluents
by Sorption of Peat Using Second-order Kinetics. Sep. Sci. Technol.36:
 M. Horsfall, Abia AA, Spiff AI (2006). Kinetic Studies on the
Adsorption of Cd2+, Cu2+ and Zn2+ ions from Aqueous Solutions by
Cassava (Manihot esculenta Vanz) Tuber Bark Waste. Bioresource Tech
 N. Boujelben et.al; Adsorption of nickel and copper onto natural iron
oxide coated sand from aqueous solutions: Study in single and
binary systems, Journal of Hazardous Materials vol. 163, 2009, pp.
 M. Doula, A. Ioannou, A. Dimirkou, Thermodynamics of copper
adsorption desorption by ca-kaolinite, Adsorption Vol.6, 2000, pp 325-
 G. Xueyuan , J.Evans, Modelling the adsorption of Cd(II), Cu(II),
Ni(II), Pb(II) and Zn(II) onto Fithian illite Journal of Colloid and
Interface Science Vol.307, 2007 pp. 317-325.
 K. Panday, K.; Prasad, G.; Singh, V. N.; Copper (II) removal from
aqueous solutions by fly ash, Wat. Res. Vol.19, 1985, pp.869.