The adsorption of malachite green (MG) on sodium-exchanged kaolinite and on the same clay treated with two widely used deflocculants, sodium hexametaphosphate (NaHMP) and sodium disilicate (NaDIS), was investigated. The results indicate that the deflocculants affect the adsorption process. In particular, DIS treatment increases physisorption, whereas HMP treatment almost completely prevents it. The Frumkin isotherm accurately describes MG adsorption for all of the adsorbents investigated and the Frumkin inter- action parameter is found to be repulsive, in keeping with the cationic nature of the adsorbed species. TheKeywords: temperature dependences of the adsorption constant and the related thermodynamic parameters H◦ adsAdsorption and S◦ ads were also determined and discussed.

Deflocculant effect on the surface properties of kaolinite investigated through malachite green adsorption / Castellini, Elena; Andreoli, Roberto; Malavasi, Gianluca; Pedone, Alfonso. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - ELETTRONICO. - 329:(2008), pp. 31-37.

Deflocculant effect on the surface properties of kaolinite investigated through malachite green adsorption

CASTELLINI, Elena;ANDREOLI, Roberto;MALAVASI, Gianluca;PEDONE, Alfonso
2008

Abstract

The adsorption of malachite green (MG) on sodium-exchanged kaolinite and on the same clay treated with two widely used deflocculants, sodium hexametaphosphate (NaHMP) and sodium disilicate (NaDIS), was investigated. The results indicate that the deflocculants affect the adsorption process. In particular, DIS treatment increases physisorption, whereas HMP treatment almost completely prevents it. The Frumkin isotherm accurately describes MG adsorption for all of the adsorbents investigated and the Frumkin inter- action parameter is found to be repulsive, in keeping with the cationic nature of the adsorbed species. TheKeywords: temperature dependences of the adsorption constant and the related thermodynamic parameters H◦ adsAdsorption and S◦ ads were also determined and discussed.
329
31
37
Deflocculant effect on the surface properties of kaolinite investigated through malachite green adsorption / Castellini, Elena; Andreoli, Roberto; Malavasi, Gianluca; Pedone, Alfonso. - In: COLLOIDS AND SURFACES. A, PHYSICOCHEMICAL AND ENGINEERING ASPECTS. - ISSN 0927-7757. - ELETTRONICO. - 329:(2008), pp. 31-37.
Castellini, Elena; Andreoli, Roberto; Malavasi, Gianluca; Pedone, Alfonso
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/596540
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