Kun et al., from Southwest Forestry University in China have developed a novel method to enhance the adsorption capacity of biocharBiochar is a carbon-rich material created from biomass decomposition in low-oxygen conditions. It has important applications in environmental remediation, soil improvement, agriculture, carbon sequestration, energy storage, and sustainable materials, promoting efficiency and reducing waste in various contexts while addressing climate change challenges. More for water treatment. Their findings, published in Scientific Reports, focus on modifying biochar with sodium dodecyl sulfate (SDS) and sapindus-saponin (SAP) to boost its ability to remove pollutants from water.

Biochar is a cost-effective and environmentally friendly option for water treatment. However, its adsorption capacity can be limited. To address this, the researchers utilized SDS, a common anionic surfactant, and SAP, a natural non-ionic surfactant derived from the soapnut fruit, to modify the biochar’s surface. These surfactants self-assemble into nanomicelles, tiny spherical structures that, when crosslinked onto the biochar surface, increase the surface area and active sites available for pollutant capture. This modification, referred to as SDMBC, resulted in a significant improvement in the adsorption of heavy metal ions like lead and cadmium, as well as organic pollutants such as bisphenol A, methylene blue, and p-nitrophenol.

The study revealed that SDMBC exhibited higher adsorption abilities compared to unmodified biochar and many other previously reported adsorbents. Notably, SDMBC maintained its efficiency even in the presence of competing pollutants, demonstrating its robustness in complex water environments. The researchers further explored the adsorption mechanism, identifying hydrogen bonding, electrostatic attraction, and π-π bonding as the key interactions responsible for pollutant removal. This research offers a promising approach for wastewater treatment using modified biochar. The use of biodegradable and natural surfactants like SDS and SAP aligns with green chemistry principles, minimizing environmental impact. This innovative strategy contributes to the development of sustainable and efficient water treatment technologies, addressing the growing need for effective solutions to combat industrial pollution.

SOURCE: Tian, K., Li, C., Liu, H., & Wang, L. (2025). Functionalization of biochar using SDS/SAP nanomicelles enhanced its immobilization capacity for dyes and heavy metals in water. Scientific Reports, 15(1), 7199. https://doi.org/10.1038/s41598-025-91229-z