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Abstract <p><b>Objective:</b> To synthesize organic xerogels from Siberian cedar bark tannins and study the effect of different crosslinking agents (formaldehyde, furfuryl alcohol, glutaraldehyde) on their properties. <b>Methods:</b> Xerogels were prepared by sol-gel condensation and characterized using density measurements, FT-IR, BET analysis, SEM, and TGA. Methylene blue sorption was tested. <b>Results and Discussion:</b> The crosslinking agent defined the gel structure. The tannin-furfuryl alcohol (T/FA) xerogel was microporous and dense (0.348 g/cm<sup>3</sup>), while tannin-formaldehyde (T/F) and tannin-glutaric (T/G) xerogels were meso/macroporous with low density (~0.07 g/cm<sup>3</sup>). T/FA was the most thermally stable (onset decomposition at 282°C). The T/F xerogel showed the highest methylene blue sorption capacity (107 mg/g). <b>Conclusions:</b> Cedar bark tannins are a promising raw material for producing xerogels. The crosslinking agent type allows control over the porosity, density, thermal stability, and sorption properties of the final material.</p>

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Influence of the Nature of the Crosslinking Agent on the Structure and Properties of the Organic Xerogels Obtained from Cedar Bark Tannins

  • 期刊论文

  • 发表日期：

    2025年12月15日

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  • N. M. Mikova,
  • I. P. Ivanov,
  • A. M. Zhizhaev,
  • O. Yu. Fetisova,
  • V. S. Borovkova,
  • B. N. Kuznetsov

摘要

Abstract

Objective: To synthesize organic xerogels from Siberian cedar bark tannins and study the effect of different crosslinking agents (formaldehyde, furfuryl alcohol, glutaraldehyde) on their properties. Methods: Xerogels were prepared by sol-gel condensation and characterized using density measurements, FT-IR, BET analysis, SEM, and TGA. Methylene blue sorption was tested. Results and Discussion: The crosslinking agent defined the gel structure. The tannin-furfuryl alcohol (T/FA) xerogel was microporous and dense (0.348 g/cm3), while tannin-formaldehyde (T/F) and tannin-glutaric (T/G) xerogels were meso/macroporous with low density (~0.07 g/cm3). T/FA was the most thermally stable (onset decomposition at 282°C). The T/F xerogel showed the highest methylene blue sorption capacity (107 mg/g). Conclusions: Cedar bark tannins are a promising raw material for producing xerogels. The crosslinking agent type allows control over the porosity, density, thermal stability, and sorption properties of the final material.