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Effect of Particle Association on 2,2′-Bipyridyl Adsorption onto Kaolinite

✍ Scribed by A.K. Helmy; E.A. Ferreiro; S.G. de Bussetti

Publisher
Elsevier Science
Year
2000
Tongue
English
Weight
118 KB
Volume
225
Category
Article
ISSN
0021-9797

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✦ Synopsis

The effect of particle concentration, in kaolin suspensions, on the adsorption of 2,2'-bipyridyl was studied. Adsorption expressed in units of micromoles per gram decreased as a result of the increase in particle concentration and also as a result of the presence of coagulant (0.25 M NaCl). Dispersion treatment with sodium hexametaphosphate increased the adsorption of bipyridyl. The decrease in adsorption with the increase in particle concentration suggests a possible relation between adsorption and flocculation phenomena. On the basis of classic flocculation theory a straight-line relation was obtained between the square root of the adsorption maximum (mmol/L) and particle concentration (g/L). It is concluded that particle association, which is a function of particle concentration, reduces the surface/aqueous interface and consequently the adsorption of bipyridyl. Copyright 2000 Academic Press.

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