Synergistic approaches to soil remediation: engineered biochar and microbial interactions for climate-resilient remediation.

The growing contamination of terrestrial systems by heavy metals and organic pollutants is driving research towards sustainable and environmentally responsible remediation technologies. Engineered biochar, developed through physical, chemical, or biological modification, has recently emerged as an attractive, multifunctional platform to facilitate more effective soil remediation. Its customized surface characteristics, large sorption capacity, and stability in the environment provide the potential to both immobilize contaminants and facilitate positive exchanges with either native or inoculated microbial communities. Biochar-microbe systems not only enhance the bioavailability of contaminants for biodegradation and immobilization but also improve soil health by enriching microbial diversity, nutrient cycling, and carbon dynamics. The novelty of this review lies in its integrative evaluation of engineered biochar-microbe interactions as a climate-resilient remediation strategy, highlighting how synergistic mechanisms of adsorption, redox transformation, and biodegradation can outperform conventional remediation approaches. The need for this review arises from the lack of comprehensive assessments that integrate technological advancements (e.g., nanoparticle doping, surface oxidation, and microbial augmentation) with ecological perspectives, cost-effectiveness, and field-scale validation. We also discuss practical case studies that confirm the real-world efficacy of biochar-microbe systems and emphasize their dual role in soil detoxification and climate change mitigation through carbon sequestration and greenhouse gas reduction. This forward-looking synthesis provides a well-defined framework for advancing biochar-microbe systems as next-generation solutions for sustainable remediation.