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Abstract <p>Mechanochemical synthesis of silicon oxycarbide composites based on mixtures of activated carbon and silica gel with different mass ratios has been performed. It was established that the obtained materials have a homogeneous amorphous structure and sufficiently developed porosity. The acid-base properties of the surface are determined by the phenol, carboxyl, and silanol groups of various configurations, with the greatest contribution from the groups with p<i>K</i><sub>a</sub> 8.5–12. An increase in the concentration of these groups with a simultaneous decrease in the concentration of groups with p<i>K</i><sub>a</sub> 0–5 results in an increase in the pH value at the zero charge point. Due to electrostatic interactions, the synthesized composites adsorb methyl orange more efficiently than they adsorb methylene blue. The highest adsorption capacity with respect to methyl orange (286.2 mg/g) was shown by the sample obtained from a mixture with a mass ratio of activated carbon to silica gel of 1 : 2.</p>

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Acid-Base Properties of the Surface of Silicon Oxycarbide Composites Based on Activated Carbon and Silica Gel and Their Effects on the Adsorption of Dyes

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • I. S. Grishin,
  • N. N. Smirnov,
  • D. N. Yashkova

摘要

Abstract

Mechanochemical synthesis of silicon oxycarbide composites based on mixtures of activated carbon and silica gel with different mass ratios has been performed. It was established that the obtained materials have a homogeneous amorphous structure and sufficiently developed porosity. The acid-base properties of the surface are determined by the phenol, carboxyl, and silanol groups of various configurations, with the greatest contribution from the groups with pKa 8.5–12. An increase in the concentration of these groups with a simultaneous decrease in the concentration of groups with pKa 0–5 results in an increase in the pH value at the zero charge point. Due to electrostatic interactions, the synthesized composites adsorb methyl orange more efficiently than they adsorb methylene blue. The highest adsorption capacity with respect to methyl orange (286.2 mg/g) was shown by the sample obtained from a mixture with a mass ratio of activated carbon to silica gel of 1 : 2.