Experimental Study of the Co-Adsorption of Cadmium and Citrate Ions onto a TiO 2 (Anatase)/Electrolyte Solution Interface

Abstract

A study of the co-adsorption of cadmium and citrate ions onto the mono-dispersed TiO₂ (anatase)/NaClO₄ aqueous solution interface is presented. The influence of ionic strength and pH on the adsorption of cadmium and citrate ions in this system was investigated. The surface charge density, the ζ-potential and adsorption-edge (or envelope) parameters such as pH_50% and ΔpH_10–90% were also determined for different concentrations of adsorbed ions. The presence of citrate anions increased the adsorption of Cd(II) ions at low pH values but led to a corresponding decrease at high pH values. The influence of pH on the shapes of the corresponding adsorption isotherms for citrate anions was characteristic of that for anion adsorption onto metal oxides; this is referred to as the “adsorption envelope”.

References

Allen

(1997) Particle Size Measurement, Chapman & Hall, London, Vol. 2.

Baes

C.F.

and Mesmer

R.E.

(1976) The Hydrolysis of Cations, Wiley-Interscience, New York.

Bénézeth

Palmer

D.A.

and Wesolowski

D.J.

(1997) J. Solution Chem. 26, 63.

Brajenovic

and Tonkovic

(2002) J. Liq. Chromatogr. Related Technol. 25, 409.

Buerge-Weirich

Behra

and Sigg

(2003) Aquat. Geochem. 9, 65.

Capone

De Robertis

De Stefano

and Sammartano

(1986) Talanta 33, 763.

Collins

C.R.

Ragnarsdottir

K.V.

and Sherman

D.M.

(1999) Geochim. Cosmochim. Acta 63, 2989.

Dagan

and Tomkiewicz

(1993) J. Chem. Phys. 97, 49.

Hayes

K.F.

and Katz

L.E.

(1996) in Physics and Chemistry of Mineral Surfaces, Bardy

P.V.

, Ed, CRC Press, New York.

10.

Huang

and Herbert

K.R.

(2004) J. Electroanal. Chem. 565, 103.

11.

Inczedy

(1979) Równowagi Kompleksowania w Chemii Analitycznej, PWN, Warsaw (in Polish).

12.

James

R.O.

and Parks

G.A.

(1982) in Surface and Colloid Science, Vol. 12, Matijevic

, Ed, Plenum Press, New York, p. 119.

13.

Janusz

and Matysek

(2006a) J. Colloid Interface Sci. 296, 22.

14.

Janusz

and Matysek

(2006b) in Surface Chemistry in Biomedical and Environmental Science, NATO Science Series II, Mathematics, Physical Chemistry, Vol. 228, Blitz

J.P.

Gun'ko

, Eds, Springer, Dordrecht, The Netherlands.

15.

Janusz

Patkowski

and Chibowski

(2003) J. Colloid Interface Sci. 266, 259.

16.

Jaroniec

Kruk

and Olivier

J.P.

(1999) Langmuir 15, 5410.

17.

Johnson

S.B.

Brown

G.E.

Healy

T.W.

and Scales

P.J.

(2005) Langmuir 21, 6356.

18.

Kosmulski

(1996) Colloids Surf. A 117, 201.

19.

Lackovic

Angove

M.J.

Wells

J.D.

and Johnson

B.B.

(2004a) J. Colloid Interface Sci. 269, 37.

20.

Lackovic

Wells

J.D.

Johnson

B.B.

and Angove

M.J.

(2004b) J. Colloid Interface Sci. 270, 86.

21.

Pivonka

Smith

and Gardiner

(2007) Transp. Porous Media 69, 215.

22.

Robertson

A.P.

and Leckie

J.O.

(1997) J. Colloid Interface Sci. 188, 444.

23.

Schindler

P.W.

(1981) Adsorption of Inorganic Ions at Solid–Liquid Interfaces, Anderson

M.A.

Rubin

A.J.

, Eds., Ann Arbor Science, Ann Arbor, MI, U.S.A.

24.

Srivastava

Singh

and Angrove

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