Humic Acid Adsorption in Aqueous Systems
Summary
Humic acids are a major component of natural organic matter in aquatic environments, originating from the decomposition of plant and microbial biomass. Their heterogeneous and high-molecular-weight character imparts strong affinity for metal ions and organic contaminants, affecting water clarity, taste and the formation of harmful disinfection by-products. Adsorption has become a leading approach for humic acid removal, employing a variety of adsorbents—activated carbons, biochars, clays, metal oxides and ion-exchange resins. Removal performance is dictated by pH, ionic strength, temperature and contact time, as well as by fundamental mechanisms such as electrostatic attraction, hydrogen bonding, ligand exchange and hydrophobic interactions. Equilibrium behaviour is often described by Langmuir and Freundlich isotherms, while adsorption kinetics frequently follow a pseudo-second-order model. Current efforts aim to tune surface chemistry for enhanced capacity and selectivity, improve regeneration and integrate adsorption with coagulation, advanced oxidation and membrane processes to meet global water treatment and wastewater reclamation challenges.
Research from Nature Portfolio
Recent research has introduced permanently magnetic anion-exchange resins synthesised by polymerising glycidyl methacrylate and crosslinking with diallyl itaconate. These materials exhibit elevated moisture content and improved adsorption capacity for humic acid through a combination of ion-exchange and electrostatic interactions. Following adsorption, the resins can be rapidly separated from solution by a magnetic field and regenerated repeatedly using saline–alkali eluents with minimal capacity loss. This work demonstrates how polymer composition and crosslink density can be leveraged to design resilient adsorbents for continuous humic acid removal in water treatment systems.
Humic Acid Adsorption in Aqueous Systems publication trend
The graph below shows the total number of articles in humic acid adsorption in aqueous systems across all publications each year (not limited to Nature Index journals).
Technical terms
Natural organic matter (NOM): A complex suite of organic compounds in water, including humic and fulvic acids.
Adsorption isotherm: A model describing solute distribution between liquid and solid at equilibrium (e.g. Langmuir, Freundlich).
Pseudo-second-order kinetics: A kinetic framework assuming adsorption rate is proportional to the square of unoccupied sites.
Anion-exchange resin: A polymeric matrix bearing positively charged groups that selectively bind negatively charged species such as humic acids.
Electrostatic interaction: Attraction between charged moieties on humic molecules and oppositely charged adsorbent surfaces.
References
- Recent advances on humic acid removal from wastewater using adsorption process. Journal of Water Process Engineering (2023).
- Preparation of Permanent Magnetic Resin Crosslinking by Diallyl Itaconate and Its Adsorptive and Anti-fouling Behaviors for Humic Acid Removal. Scientific Reports (2017).
- Performance of granular ferric hydroxide process for removal of humic acid substances from aqueous solution based on experimental design and response surface methodology. MethodsX (2018).
- Silica-coated magnetite nanoparticles core-shell spheres (Fe3O4@SiO2) for natural organic matter removal. Journal of Environmental Health Science and Engineering (2016).
About these summaries
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