Activated Carbon Production from Biomass Waste Materials

Activated carbon derived from biomass waste emerges as a sustainable route to high-performance adsorbents by converting abundant agricultural and lignocellulosic residues into porous carbon structures. The production process typically involves a carbonisation step to decompose organic matter, followed by activation—either physical (steam or carbon dioxide) or chemical (phosphoric acid, potassium hydroxide)—to develop a high specific surface area and well-distributed micro- and mesopores. Feedstocks range from agricultural residues, fruit shells and nut kernels to coffee grounds and invasive grasses. Optimisation of activation parameters—such as temperature, activating agent ratio and duration—influences pore size distribution and surface chemistry, which in turn determine adsorption capacity for pollutants, gases and hydrogen. These materials address pressing environmental challenges by enabling water and air purification, energy storage and resource recovery, while valorising waste streams in a circular economy framework. Emerging techniques, including microwave-assisted activation and combined physical-chemical treatments, are refining energy efficiency and tailoring surface functionalisation. The field continues to advance towards scalable, low-cost production methods that balance yield, porosity and sustainability.

Research from Nature Portfolio

Recent studies have demonstrated the transformation of high-alkali silicate herbaceous biomass into hierarchical carbon materials with exceptional adsorption performance. Two successive chemical activation steps—first with phosphoric acid and then with potassium hydroxide—have produced activated carbons with Brunauer–Emmett–Teller surface areas exceeding 1300 m²/g and total pore volumes approaching 1 cm³/g. Subsequent synthesis of multi-walled carbon nanotubes from these activated carbons has extended functionality towards heavy metal removal, achieving lead uptake efficiencies of around 90 % within the first hour. This work exemplifies the potential of valorising waste lignocellulosic biomass in an integrated approach that merges activated carbon production with advanced carbon nanomaterial synthesis, underpinning circular economy objectives and offering versatile solutions for water treatment and energy applications.

Activated Carbon Production from Biomass Waste Materials publication trend

The graph below shows the total number of articles in activated carbon production from biomass waste materials across all publications each year (not limited to Nature Index journals).

Technical terms

Activated carbon: A high surface area carbon material with a network of micro- and mesopores used for adsorption.

Carbonisation: Thermal decomposition of biomass in an inert atmosphere to produce char.

Physical activation: Activation method employing oxidising gases (steam, CO₂) to develop porosity.

Chemical activation: Use of chemical reagents (e.g. KOH, H₃PO₄) to etch and create porous structures.

Specific surface area: Surface area per unit mass of a material, typically measured by gas adsorption.

Micropore / Mesopore: Pores with diameters <2 nm (micropores) or 2–50 nm (mesopores), critical for adsorption kinetics and capacity.

References

1. Optimized activation of coffee-ground carbons for hydrogen storage. International Journal of Hydrogen Energy (2025).
2. Preparation of activated carbon from biomass and its’ applications in water and gas purification, a review. Journal of the Association of Arab Universities for Basic and Applied Sciences (2020).
3. A Review of Chemicals to Produce Activated Carbon from Agricultural Waste Biomass. Sustainability (2019).
4. The production and application of carbon nanomaterials from high alkali silicate herbaceous biomass. Scientific Reports (2020).
5. Activated Carbon from Biomass Sustainable Sources. C – Journal of Carbon Research (2021).