Adsorption Mechanisms in Porous Carbon Materials

Adsorption onto porous carbon materials leverages their high specific surface area, well-developed pore architecture and tunable surface chemistry. Mechanisms encompass physisorption governed by van der Waals forces within micro- and mesopores, and chemisorption arising from specific interactions between adsorbates and surface functional groups such as carboxyl or nitrogen sites. The interplay between pore size distribution and surface chemistry dictates uptake capacity, selectivity and adsorption kinetics. Recent advances exploit hierarchical porosity to reconcile rapid mass transport with large uptake, while introducing heteroatoms to tailor affinity for gases, dyes, heavy metals or organic molecules. Synthetic strategies range from biomass-derived biochars to graphene-based frameworks, enabling scalable and sustainable production. Improved mechanistic understanding has spurred applications in carbon capture, water treatment, waste-to-energy processes and chemical sensing. Global efforts focus on designing carbon adsorbents that balance high adsorption capacity with facile regeneration, contributing to circular-economy solutions and greenhouse-gas mitigation. Emerging computational models and in situ characterisation methods are elucidating dynamic adsorption phenomena, guiding the rational design of next-generation porous carbons with optimised performance across environmental and energy-related domains.

Research from Nature Portfolio

Recent studies have demonstrated that biomass-derived porous biochar from agricultural residues can achieve ultrahigh adsorption capacities for urea in aqueous media, combining rapid physisorption within well-developed micropores and strong chemisorption via oxygen-containing groups. Optimised carbonisation and activation parameters yield a material that follows pseudo-second-order kinetics and fits heterogeneous isotherm models, underscoring a synergistic mechanism. This approach not only improves urea recovery for nutrient recycling but also illustrates how functional-group engineering and hierarchical porosity can be tuned for efficient, scalable adsorbents.

Adsorption Mechanisms in Porous Carbon Materials publication trend

The graph below shows the total number of articles in adsorption mechanisms in porous carbon materials across all publications each year (not limited to Nature Index journals).

Technical terms

Physisorption: Reversible adsorption driven by weak van der Waals forces in pores.

Chemisorption: Adsorption involving chemical bond formation between adsorbate and surface functional groups.

Micropore: Porous cavity with diameter below 2 nm, critical for high surface area.

Mesopore: Pore size between 2 and 50 nm, facilitating rapid mass transport.

Surface functional groups: Chemical moieties (e.g. carboxyl, hydroxyl, nitrogen) on carbon surfaces that govern specific adsorption interactions.

Pseudo-second-order kinetics: A kinetic model indicating adsorption rate controlled by chemisorption.

References

1. Effect of functional groups on the adsorption of urea on activated carbon. Carbon (2024).
2. Ultrahigh and kinetic-favorable adsorption for recycling urea using corncob-derived porous biochar. Scientific Reports (2024).
3. Synthesis and Characterization of Acidic Activated Carbon from Corncobs for Adsorption Desulfurization of Simulated Crude Oil. Journal of Ecological Engineering (2024).
4. Nitrogen-doped graphene-like carbon material derived via a simple, cost-effective method as an excellent adsorbent for methylene blue adsorption. E3S Web of Conferences (2020).