Turning fallen leaves into powerful water cleaners: new biochar removes toxic dye with high efficiency
image: "Theory of Pore Conflation" and "Shubhjyot's equation" in the treatment of Brilliant green dye-contaminated water using Jamun leaves biochar
Credit: Shubham Sutar & Jyoti Jadhav
A study has demonstrated that discarded Jamun tree leaves can be transformed into a highly effective material for cleaning dye-contaminated water, offering a low-cost and environmentally friendly solution to a growing pollution challenge.
Researchers have developed a biochar derived from Syzygium cumini leaves that can remove nearly all traces of Brilliant Green, a widely used industrial dye known for its toxic and potentially carcinogenic effects. The work highlights how agricultural waste can be repurposed into advanced materials for environmental remediation.
“Using simple pyrolysis, we converted abundant leaf waste into a high-performance adsorbent that can efficiently capture harmful dye molecules from water,” said the study’s corresponding author. “This approach not only addresses pollution but also supports circular economy principles.”
Brilliant Green is commonly used in industries such as textiles, plastics, and aquaculture, but its release into wastewater poses serious risks to ecosystems and human health. Conventional treatment methods such as chemical oxidation, membrane filtration, and microbial degradation are often costly, energy-intensive, or inefficient.
The newly developed biochar offers a promising alternative. Produced at high temperature under limited oxygen conditions, the material forms a porous structure rich in functional groups that attract and bind dye molecules. Under optimized conditions, the biochar achieved a maximum adsorption capacity of 243.90 milligrams per gram, outperforming many conventional low-cost adsorbents.
The researchers also introduced a new theoretical framework called the “Theory of Pore Conflation” to explain why adsorption improves at higher temperatures. According to this concept, elevated temperatures cause adjacent pores within the biochar structure to merge, increasing accessible surface area and exposing additional binding sites.
In addition, the study proposes a new mathematical model known as “Shubhjyot’s equation,” which accounts for time-dependent changes in adsorption capacity. This model provides a more accurate description of how pollutants interact with biochar over time, improving predictive capabilities for real-world applications.
Laboratory experiments showed that the adsorption process is spontaneous and endothermic, meaning it becomes more effective at higher temperatures. The biochar also demonstrated strong reusability, maintaining performance over multiple cycles when regenerated using a simple solvent treatment.
Importantly, safety tests revealed that the biochar itself is environmentally benign. Phytotoxicity and cytotoxicity assessments confirmed that treated water showed significantly reduced harmful effects compared to untreated dye solutions, underscoring the material’s potential for safe deployment.
Beyond its performance, the biochar stands out for its sustainability. Jamun leaves are widely available as agricultural or urban waste in tropical and subtropical regions, making them an inexpensive raw material. Converting such waste into functional adsorbents could reduce reliance on more expensive materials like activated carbon while minimizing environmental impact.
“Our findings show that biochar from natural waste can compete with, and in some cases outperform, traditional adsorbents,” the authors noted. “This opens new pathways for scalable, low-cost water treatment technologies.”
As water pollution continues to rise globally, especially in rapidly industrializing regions, innovations like this offer practical solutions that combine efficiency, affordability, and sustainability.
===
Journal Reference: Sutar, S., Jadhav, J. "Theory of Pore Conflation" and "Shubhjyot's equation" in the treatment of Brilliant green dye-contaminated water using Jamun leaves biochar. Biochar 7, 11 (2025).
https://doi.org/10.1007/s42773-024-00406-2
===
About Biochar
Biochar (e-ISSN: 2524-7867) is the first journal dedicated exclusively to biochar research, spanning agronomy, environmental science, and materials science. It publishes original studies on biochar production, processing, and applications—such as bioenergy, environmental remediation, soil enhancement, climate mitigation, water treatment, and sustainability analysis. The journal serves as an innovative and professional platform for global researchers to share advances in this rapidly expanding field.