New research shows that biochar, long used to improve soil health, is rapidly expanding into applications that include wastewater treatment, carbon capture and renewable energy production. A recent review highlights how engineered biochar’s porous structure, surface chemistry and electrical properties can enhance nutrient recovery, boost biogas generation and absorb carbon dioxide. Researchers say these advances position biochar as a multifunctional material capable of linking water, carbon and energy systems within a circular, low-carbon framework, though challenges remain around scalability and long-term performance.