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The influence of an acid treatment on the surface charge density of silica gel

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Abstract

The influence of an acid treatment on the pore structure as well as on the surface charge density of porous silica was investigated. It is shown that this treatment causes only small changes of the pore structure. Positive values of the surface charge density at pH>4 are interpreted in terms of surface impurities consisting of Na+ ions resulting from the synthesis of the gel from sodium silicate solution. This effect is strongly influenced by the acid treatment. The surface charge density parameters were evaluated on the basis of the triple-layer model for the electrical double layer. Here two different mechanisms of counterion attachment in the inner Helmholtz plane are discussed.

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Correspondence to J. Sonnefeld.

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Sonnefeld, J. The influence of an acid treatment on the surface charge density of silica gel. Colloid Polym Sci 274, 1137–1144 (1996). https://doi.org/10.1007/BF00655684

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Key words

  • Surface charge density
  • silica gel
  • potentiometric titration
  • triple-layer model