The adsorption of hexametaphosphate ion, an important deflocculant used in the ceramic industry, from aqueous solutions onto kaolinite has been studied at different temperatures. The adsorption isotherm follows the Langmuir model: the thermodynamic parameters Delta G(ads)(0), Delta H-ads(0) and Delta S-ads(0) as were calculated and found to be consistent with an interaction model involving the formation of an inner-sphere complex between HMP and aluminol groups. Also, the dependence of the adsorption behavior on the kaolinite volume fraction has been studied and discussed in term of association processes between the clay particles.
Thermodynamic aspects of the adsorption of hexametaphosphate on kaolinite / Castellini, Elena; Lusvardi, Gigliola; Malavasi, Gianluca; Menabue, Ledi. - In: JOURNAL OF COLLOID AND INTERFACE SCIENCE. - ISSN 0021-9797. - ELETTRONICO. - 292:2(2005), pp. 322-329. [10.1016/j.jcis.2005.05.065]
Thermodynamic aspects of the adsorption of hexametaphosphate on kaolinite
CASTELLINI, Elena;LUSVARDI, Gigliola;MALAVASI, Gianluca;MENABUE, Ledi
2005
Abstract
The adsorption of hexametaphosphate ion, an important deflocculant used in the ceramic industry, from aqueous solutions onto kaolinite has been studied at different temperatures. The adsorption isotherm follows the Langmuir model: the thermodynamic parameters Delta G(ads)(0), Delta H-ads(0) and Delta S-ads(0) as were calculated and found to be consistent with an interaction model involving the formation of an inner-sphere complex between HMP and aluminol groups. Also, the dependence of the adsorption behavior on the kaolinite volume fraction has been studied and discussed in term of association processes between the clay particles.
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