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Abstract

The removal of Zn(II) ions from aqueous solution was studied using natural, thermally-activated and acid-activated kaolinite samples at different temperatures. The linear Langmuir, Freundlich and Dubinin– Radushkevich (D–R) adsorption equations were applied to describe the equilibrium isotherms. The Langmuir constants for natural kaolinite were found to be negative whereas, for the other samples, the isotherm models gave a good fit. In addition, the pseudo-first-order and pseudo-second-order models were used to determine the kinetic data. The experimental data were well fitted by the pseudo-second-order kinetic model. Thermodynamic parameters such as the enthalpy (ΔH⁰), Gibbs' free energy (ΔG⁰) and entropy (ΔS⁰) were calculated for natural, thermally-activated and acid-activated kaolinite. These values showed that the adsorption of Zn(II) ions onto activated kaolinite was controlled by a physical mechanism and occurred spontaneously. The process of adsorption was favoured at high temperatures, with the adsorption capacity of the acid-activated kaolinite being greater relative to that of natural and thermally-activated kaolinite at various temperatures.

References

Abollino

Aceto

Malandrino

Sarzanini

and Mentasti

(2003) Water Res. 37, 1619.

Adebowale

K.O.

Unuabonah

I.E.

and Olu-Owolabi

B.I.

(2006) J. Hazard. Mater. B134, 130.

Al-Degs

Khraısheh

M.A.M.

and Tutunjı

M.F.

(2001) Water Res. 35, 3724.

Auboiroux

Baillif

Touray

J.C.

and Bergaya

(1996) Appl. Clay Sci. 11, 117.

Bhattacharyya

K.G.

and Gupta

Sen S.

(2008) Appl. Clay Sci. 41, 1.

Boult

K.A.

Cowper

M.M.

Heath

T.G.

Sato

Shibutani

and Yui

(1998) J. Contam. Hydrol. 35, 141.

Coles

C.A.

and Yong

R.N.

(2002) Appl. Clay Sci. 22, 39.

Coppin

Berger

Bauer

Castet

and Loubet

(2002) Chem. Geol. 182, 57.

Dubinin

M.M.

(1960) Chem. Rev. 60, 23.

10.

Espantaleon

A.G.

Nieto

J.A.

Fernandez

and Marsal

(2003) Appl. Clay Sci. 24, 105.

11.

Fan

Liu

Feng

Zeng

Yang

Zhou

Tan

and Wang

(2008) J. Hazard. Mater. 161, 655.

12.

and Evans

L.J.

(2008) Geochim. Cosmochim. Acta 72, 267.

13.

Y.S.

and McKay

(1999) Process Biochem. 34, 451.

14.

Jiang

Pang

and Liao

(2009) J. Hazard. Mater. 164, 1.

15.

Kocasoy

(1999) “Removal of Heavy Metal from Industrial Wastewater by Using Natural Zeolites”, Proc. Int. Conf. Urban Pollution Control Technology, Hong Kong, pp. 209–214.

16.

Koyuncu

Kul

A.R.

Yıldız

Calımlı

and Ceylan

(2007) J. Hazard. Mater. 141, 128.

17.

Kubilay

Gürkan

Savran

and Sahan

(2007) Adsorption 13, 41.

18.

Lin

S.H.

and Juang

R.S.

(2002) J. Hazard. Mater. B92, 315.

19.

and Eggleton

R.A.

(1999) Clays Clay Miner. 47, 181.

20.

Mrozik

Jungnickel

Skup

Urbaszek

and Stepnowski

(2008) Environ. Chem. 5, 299.

21.

Nandi

B.K.

Goswami

and Purkait

M.K.

(2009) Appl. Clay Sci. 42, 583.

22.

Orhan

and Buyukgungor

(1993) Water Sci. Technol. 28, 247.

23.

Ozcan

A.S.

Erdem

and Ozcan

(2004) J. Colloid Interface Sci. 280, 44.

24.

Rameback

Albinsson

Skalberg

Eklund

U.B.

Kjellberg

and Werme

(2000) J. Nucl. Mater. 277, 208.

25.

Rauf

and Tahir

S.S.

(2000) J. Chem. Thermodyn. 32, 651.

26.

Sabah

Turan

and Çelik

M.S.

(2002) Water Res. 36, 3957.

27.

Sari

Tuzen

Citak

and Soylak

(2007) J. Hazard. Mater. 149, 283.

28.

Shahwan

Akar

and Eroglu

A.E.

(2005) J. Colloid Interface Sci. 285, 9.

29.

Srivastava

Singh

and Angove

(2005) J. Colloid Interface Sci. 290, 28.

30.

Suraj

Iyer

C.S.P.

and Lalithambika

(1998) Appl. Clay Sci. 13, 293.

31.

Tang

and Chen

(2009) J. Hazard. Mater. 161, 824.

32.

Tekin

Demirbas

and Alkan

(2005) Microporous Mesoporous Mater. 85, 340.

33.

Tekin

Kadıncı

Demirbas

Alkan

and Kara

(2006) J. Colloid Interface Sci. 296, 472.

34.

Ucun

Aksakal

and Yıldız

(2009) J. Hazard. Mater. 161, 1040.

35.

Unuabonah

E.I.

Adebowale

K.O.

and Olu-Owolabi

B.I.

(2007) J. Hazard. Mater. 144, 386.

36.

Veli

and Alyuz

(2007) J. Hazard. Mater. 149, 226.

37.

Yavuz

Altunkaynak

and Guzel

(2003) Water Res. 37, 948.

Equilibrium and Kinetic Studies of the Adsorption of Zn(II) Ions onto Natural and Activated Kaolinites

Abstract

References