Adsorption of some Weak Organic Electrolytes from Aqueous Solutions on Silica
The adsorption of organic electrolytes from aqueous solutions on various adsorbents has been frequently investigated because of its importance in water purification. Phenol and substituted phenols are very common contaminants of water. In this paper, the adsorption results of some weak organic elect...
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Veröffentlicht in: | Materials science forum 2007-09, Vol.555, p.195-200 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The adsorption of organic electrolytes from aqueous solutions on various adsorbents has
been frequently investigated because of its importance in water purification. Phenol and substituted
phenols are very common contaminants of water. In this paper, the adsorption results of some weak
organic electrolytes (hydrochinon, phloroglucin and acidum gallicum) from aqueous solutions on
silica are presented. The adsorption of the organics was investigated by the batch method. Effects of
solution pHs (in the 2-10 range) and concentrations of these compounds on the adsorption were
investigated. In the case of acidum gallicum, adsorption isotherms (in the 2-6 pH range) were
determined. The obtained results indicate that the amount of adsorbed acidum gallicum increases
with its increasing concentration. The maximum adsorption was recorded at pH=2-3 (pH equal to
pHpzc of SiO2) with acidum gallicum molecule being undissociated (pKa= 4.41). The experimental
data were fitted with different adsorption isotherms models. The maximum amount of acidum
gallicum adsorbed as well as the Freundlich constants of adsorption were calculated. The adsorption
of hydrochinon and phloroglucin from aqueous solutions (in the investigated pH range) on silica
was negligible. |
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ISSN: | 0255-5476 1662-9752 1662-9752 |
DOI: | 10.4028/www.scientific.net/MSF.555.195 |