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<p>Heavy metal ions cause many environmental problems for humans due to their known toxic effects on the life cycle of plants and animals. Synthesizing adsorbents to remove these&#xa0;toxic ions&#xa0;from wastewater is an important research topic in environmental pollution control. In this study, we investigated the potential of silica aerogel functionalized with amine groups as a new absorbent to remove heavy metal ions like copper, zinc, lead, and cobalt from aqueous solutions. The&#xa0;synthesized silica&#xa0;aerogel was characterized using XRD, TGA, SEM, FTIR, BET, and zeta potential. Continuous and non-continuous systems were used to study the absorption process. Results showed that the amount of&#xa0;amine functional groups&#xa0;on the surface of silica aerogel,&#xa0;initial pH&#xa0;of the solution, initial concentration of metal ions, contact time, and amount of adsorbent affected ion absorption. The information obtained from measuring absorption was evaluated by applying the Langmuir and&#xa0;the Freundlich isotherm models&#xa0;for analysis. Maximum absorption capacity&#xa0;for silica aerogel functionalized with amine groups for heavy metals such as copper, lead, zinc, and cobalt were 94.29, 87.23, 31.23, and 26.23. Additionally, examining two pseudo-first-order and pseudo-second-order kinetic models showed that the&#xa0;kinetic data&#xa0;were highly consistent with the pseudo-first-order model.</p>

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Smart silica aerogel for the efficient removal of heavy metals from real industrial wastewater

  • 期刊论文

  • 发表日期：

    2025年12月10日

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  • S. Ramezanian,
  • J. Moghaddas,
  • M. Ghovvati

摘要

Heavy metal ions cause many environmental problems for humans due to their known toxic effects on the life cycle of plants and animals. Synthesizing adsorbents to remove these toxic ions from wastewater is an important research topic in environmental pollution control. In this study, we investigated the potential of silica aerogel functionalized with amine groups as a new absorbent to remove heavy metal ions like copper, zinc, lead, and cobalt from aqueous solutions. The synthesized silica aerogel was characterized using XRD, TGA, SEM, FTIR, BET, and zeta potential. Continuous and non-continuous systems were used to study the absorption process. Results showed that the amount of amine functional groups on the surface of silica aerogel, initial pH of the solution, initial concentration of metal ions, contact time, and amount of adsorbent affected ion absorption. The information obtained from measuring absorption was evaluated by applying the Langmuir and the Freundlich isotherm models for analysis. Maximum absorption capacity for silica aerogel functionalized with amine groups for heavy metals such as copper, lead, zinc, and cobalt were 94.29, 87.23, 31.23, and 26.23. Additionally, examining two pseudo-first-order and pseudo-second-order kinetic models showed that the kinetic data were highly consistent with the pseudo-first-order model.