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Purpose <p>Widespread aquatic pollution by anionic surfactants (AS) requires effective remediation. This study quantifies the binding capacity and mechanism of dissolved humic acids (HAs) from various peats towards model and industrial AS, assessing their potential as natural sorbents.</p> Methods <p>HAs were isolated, characterized (UV-Vis, FTIR, elemental analysis), and their interaction with model AS (SDS, SLS, SDBS) and industrial detergents was studied. Binding efficiency was evaluated using extractive-photometric/fluorimetric methods. The impact of HAs on SDS critical micelle concentration (CMC) was studied stalagmometrically. Binding constants (KOC) and extraction degree (Q,%) were determined. Quantum chemical modeling elucidated the interaction mechanism.</p> Results <p>HAs showed high AS binding capacity, reducing AS in model solutions by 96.5–98.3%. Efficiency depended on HA and AS structure, following SDBS &gt; SLS &gt; SDS. Modeling confirmed this order and identified hydrophobic interactions and hydrogen bonding as dominant. HAs lowered SDS CMC, indicating mixed associate formation. Optimal contact time was 2&#xa0;h. Treatment of real wastewater with HAs (1.0&#xa0;g/L) reduced AS by 20–60%.</p> Conclusion <p>Humic acids are effective natural sorbents for AS, forming insoluble complexes. Their application is most suitable at wastewater treatment’s final stages. Formation of non-toxic HA-AS associates, combined with HAs’ ability to enhance microbial AS degradation, makes them a promising, environmentally safe agent for water purification.</p>

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Investigation of the binding ability of dissolved humic acids in relation to anionic surfactants

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Elena Dmitrievna Dmitrieva,
  • Pavel Vladimirovich Oskin

摘要

Purpose

Widespread aquatic pollution by anionic surfactants (AS) requires effective remediation. This study quantifies the binding capacity and mechanism of dissolved humic acids (HAs) from various peats towards model and industrial AS, assessing their potential as natural sorbents.

Methods

HAs were isolated, characterized (UV-Vis, FTIR, elemental analysis), and their interaction with model AS (SDS, SLS, SDBS) and industrial detergents was studied. Binding efficiency was evaluated using extractive-photometric/fluorimetric methods. The impact of HAs on SDS critical micelle concentration (CMC) was studied stalagmometrically. Binding constants (KOC) and extraction degree (Q,%) were determined. Quantum chemical modeling elucidated the interaction mechanism.

Results

HAs showed high AS binding capacity, reducing AS in model solutions by 96.5–98.3%. Efficiency depended on HA and AS structure, following SDBS > SLS > SDS. Modeling confirmed this order and identified hydrophobic interactions and hydrogen bonding as dominant. HAs lowered SDS CMC, indicating mixed associate formation. Optimal contact time was 2 h. Treatment of real wastewater with HAs (1.0 g/L) reduced AS by 20–60%.

Conclusion

Humic acids are effective natural sorbents for AS, forming insoluble complexes. Their application is most suitable at wastewater treatment’s final stages. Formation of non-toxic HA-AS associates, combined with HAs’ ability to enhance microbial AS degradation, makes them a promising, environmentally safe agent for water purification.