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<p>A HF-free strategy for the controlled dissolution and quantitative determination of Si and Au in gold-doped silica aerogels was developed. The approach is based on a sequential dissolution procedure involving (i) acetone-induced structural modification of the aerogel network, (ii) alkaline dissolution of the silica matrix, and (iii) subsequent acidic dissolution of Au using aqua regia. The results demonstrate that acetone pretreatment significantly enhances dissolution efficiency by improving the structural accessibility of the highly porous silica network, enabling quantitative dissolution and recovery of Si and Au under the applied conditions. Matrix-matched calibration was applied to compensate for matrix effects associated with alkaline dissolution, allowing reliable quantification of both elements by ICP-OES. Limits of quantification of 0.06 wt.% for Si and 0.02 wt.% for Au were achieved under the optimized conditions. These findings provide a practical HF-free analytical procedure for the characterization of gold-doped silica aerogels under the studied conditions and highlight the importance of sample pretreatment in achieving quantitative dissolution.</p><p></p>

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HF-free dissolution of gold-doped silica aerogels: role of structural modification in sol–gel-derived porous networks

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月3日

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  • Hagit Sela,
  • Ilan Metodi,
  • Eyal Elish,
  • Guy Lazovski,
  • Adira H. Marcus,
  • Galit Bar,
  • Arnon A. Rubinshtein

摘要

A HF-free strategy for the controlled dissolution and quantitative determination of Si and Au in gold-doped silica aerogels was developed. The approach is based on a sequential dissolution procedure involving (i) acetone-induced structural modification of the aerogel network, (ii) alkaline dissolution of the silica matrix, and (iii) subsequent acidic dissolution of Au using aqua regia. The results demonstrate that acetone pretreatment significantly enhances dissolution efficiency by improving the structural accessibility of the highly porous silica network, enabling quantitative dissolution and recovery of Si and Au under the applied conditions. Matrix-matched calibration was applied to compensate for matrix effects associated with alkaline dissolution, allowing reliable quantification of both elements by ICP-OES. Limits of quantification of 0.06 wt.% for Si and 0.02 wt.% for Au were achieved under the optimized conditions. These findings provide a practical HF-free analytical procedure for the characterization of gold-doped silica aerogels under the studied conditions and highlight the importance of sample pretreatment in achieving quantitative dissolution.