Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 457, Issue -, Pages 419-424Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2014.06.014
Keywords
Adsorption; alpha-Alumina; 3,4-Dihydroxybenzoic acid; Point of zero charge; Specific ion effect
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Funding
- council of Scientific and Industrial Research, New Delhi, India
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In the scope of adsorption of simple organic acid at the mineral oxide-water interface that represent natural ecosystem, adsorption of 3,4-dihydroxybenzoic acid onto alpha-alumina is explored in the presence of different salts at pH 5 and 7. The adsorption isotherms showed a critical salt concentration (in the present system it is 0.025 mM) that demarcates positive and negative effects of different salts on the adsorption densities of 3,4-dihydroxybenzoic acid onto alpha-alumina surface. The theoretical origin of specific ion effects below and above the critical salt concentration is likely to be different. Nevertheless, at higher salt concentration the polarizability of ions is reasonably accounted for the specific ion effects. (C) 2014 Elsevier B.V. All rights reserved.
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