Humic acid attachment on chitosan-modified silica gel as an economical, efficient, and selective adsorbent for thorium and uranium removal

Prasetyo, Erik; Toyoda, Kazuhiro

doi:10.1080/09593330.2021.1968038

Cited by 2 publications

(2 citation statements)

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“…Materials consisting of silica and humic substances have been described as sorbents for heavy metal ions, like Pb 2 + or Hg 2 + , as well as for the removal of radioactive metals, such as thorium and uranium. [21,22,23] HS-doped silica materials have also shown the possibilities of sorption of Cu 2 + and Zn 2 + ions. [24] Furthermore, humic substances, in the presence of minerals, are capable of creating a connection with phosphates.…”

Section: Introductionmentioning

confidence: 99%

“…In the context of pollution removal, the interaction between humic substances and silicates was widely discussed. Materials consisting of silica and humic substances have been described as sorbents for heavy metal ions, like Pb 2+ or Hg 2+ , as well as for the removal of radioactive metals, such as thorium and uranium [21,22,23] . HS‐doped silica materials have also shown the possibilities of sorption of Cu 2+ and Zn 2+ ions [24] .…”

Section: Introductionmentioning

confidence: 99%

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Ultrasound‐Assisted Synthesis of Humic‐Silica Composites by the Isolation of Humic Substances from Peat and Lignite

Nieweś,

Biegun,

Marecka

et al. 2024

ChemPlusChem

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The aim of the presented study was to evaluate an integrated, direct procedure for the synthesis of humic‐silica composites (HSiC) by the isolation of humic substances (HS) from peat and lignite by the use of sodium silicate solution as an extractant. The obtained materials, because of the presence of humic functional groups, may potentially be used for removing contaminants from aqueous solutions. The quantitative assessment was based on experiments designed according to the Box‐Behnken plan. The statistical analysis of the results allowed to determine the optimal conditions of the process tested, for which the isolation efficiency of humic substances (HS) was greater than 50% for both raw materials. This made it possible to synthesize humic silica composites with a high content of HS, which have been qualitatively evaluated. This step was focused on the analysis of the humic structure using elemental analysis, spectroscopic methods, and differential thermal analysis coupled with thermogravimetry. On the basis of them, the presence of structures characteristic for HS in the HSiC tested was observed. Moreover, the results of the thermal analysis pointed to the higher thermal stability of the synthesized compounds, compared to the HS isolated with the use of a traditional extractant.

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