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Aged biochar–nanoparticle composites for agricultural soil remediation: Mechanistic insights, engineering design, ecological risks, and translational perspectives
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This review pulls together research on biochar, a charcoal-like soil additive enhanced with nanoparticles, used to clean farmland contaminated with toxic metals, pesticides, and microplastics. It finds that biochar's ability to trap these pollutants changes over time and can sometimes create new risks, like released nanoparticles or resistant bacteria, so cleanup methods need long-term safety testing, not just short-term results.
Agricultural soils increasingly receive mixtures of toxic metals, pesticides, antibiotics, and micro- and nanoplastics, creating simultaneous risks to crop productivity, food safety, soil biological function, and water quality. Biochar is a scalable carbonaceous amendment, but its performance evolves after application because oxidation, fragmentation, mineral association, and microbial colonization alter the reactive interface. This review advances an aging–engineering–risk–translation framework that links time-dependent biochar transformation with nanoparticle functionalization and field performance, rather than treating fresh biochar or nanocomposites as static adsorbents. The literature was critically screened with emphasis on 2019–2026 studies and earlier mechanistic papers where required. Natural aging can increase oxygen-containing surface functionality and organo-mineral association, and multi-year field evidence shows that immobilization of lead, copper, and cadmium can strengthen with aging under favorable conditions. Nanoparticle-modified biochars add contaminant-specific functions, including ligand exchange, redox transformation, photocatalytic oxidation, and magnetic recovery; however, the optimum design is soil- and contaminant-specific rather than universally transferable. The review also evaluates secondary risks, including nanoparticle detachment or dissolution, environmentally persistent free radicals, polycyclic aromatic hydrocarbons, mobile nano-biochar, antibiotic resistance determinants, and effects on microorganisms, soil enzymes, earthworms, and plants. A central conclusion is that high removal percentage alone is an inadequate endpoint: durable immobilization, transformation-product toxicity, biological function, recoverability, lifecycle burden, and field aging must be evaluated together. These insights provide a mechanistic basis for designing safer, durable, and field-relevant biochar–nanoparticle systems for agricultural soil remediation.
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Researchers investigated how biochar nanoparticles affect the transport of organic contaminants through porous soil media, finding that nanoparticles formed from aged biochar significantly enhanced contaminant mobility, raising concerns about unintended consequences of biochar soil amendments.
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This review examines how biochar, a charcoal-like material made from organic waste, can improve soil health and clean up pollutants including microplastics. Biochar's ability to absorb and trap contaminants makes it a promising tool for reducing microplastic pollution in agricultural soil. The findings suggest biochar could help limit the amount of microplastics that enter the food chain through crops grown in contaminated soil.
Biochar as a Climate-Smart Approach for Soil Health Improvement and Nano-/Microplastics Mitigation in Sustainable Agriculture: A Review
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Tiny plastic particles are building up in farm soils, potentially working their way into the crops we eat—but this review of existing research shows that biochar (a charcoal-like material made from plant waste) can trap these plastics in the soil, keeping them from moving into food crops. Biochar also boosts soil health by helping it retain water and nutrients, meaning healthier farmland could mean safer, more plastic-free food on our plates. That said, this is a summary of past studies rather than new experiments, and biochar isn't a perfect fix—it can backfire in certain salty, high-pH soils.
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