Protolytic equilibria on the surface of carboxyl-containing silica View Full Text


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Article Info

DATE

1986-03

AUTHORS

D. V. Mil'chenko, G. V. Kudryavtsev, G. V. Lisichkin

ABSTRACT

Potentiometric titration has been used to study the protolytic equilibria on the surface of carboxyl-containing silica (CS) prepared by the reaction of silica (Silokhrom S-80, Ssp = 80 m2/g) with Cl3SiCH2CH2COOCH3, followed by hydrolysis with 30% sulfuric acid. The titration curve of the vacuum-dried sample is irreversible. The titration curve of its Na+ form with hydrochloric acid proceeds lower than the titration curve of its H+ form and coincides with the titration curve of the air-dried sample (the last curve is reversible). The titration curve of CS coincides with the titration curve of butyric acid at pH < 6. At pH > 6 the titration curve of CS passes below the titration curve of butyric acid; this is due to the participation of silanol groups on the silica surface in the protolytic equilibria. The pKa of the grafted CS groups is equal to 4.80 which is close to the pKa value of butyric acid (4.78). A method has been proposed for the determination of the amount of weak acid groups grafted to the silica. It has been shown that in the titration of CS the equilibrium is established much faster than in the case of the unmodified silica. More... »

PAGES

227-230

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf00519201

DOI

http://dx.doi.org/10.1007/bf00519201

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1053459821


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