The journal Results in Engineering recently accepted a comprehensive review by authors Tumelo M. Mogashane, Moshalagae A. Motlatle, Andile C. Mkhohlakali, Lebohang V. Mokoena, and James Tshilongo regarding the use of biochar-based adsorption for polycyclic aromatic hydrocarbons in contaminated soils. Polycyclic aromatic hydrocarbons represent a hazardous class of organic chemicals primarily produced by the incomplete combustion of fossil fuels, biomassBiomass is a complex biological organic or non-organic solid product derived from living or recently living organism and available naturally. Various types of wastes such as animal manure, waste paper, sludge and many industrial wastes are also treated as biomass because like natural biomass these More burning, and various industrial processes. Because these pollutants are hydrophobic and highly stable, they tend to accumulate in terrestrial ecosystems, posing significant long-term risks to human health, groundwater safety, and food security. Standard treatment procedures often prove ineffective or prohibitively expensive, leading researchers to seek more sustainable and economical alternatives for soil restoration.

Recent findings indicate that biochar has emerged as a premier candidate for soil remediation due to its unique physicochemical properties. As a carbon-rich material produced through the pyrolysisPyrolysis is a thermochemical process that converts waste biomass into bio-char, bio-oil, and pyro-gas. It offers significant advantages in waste valorization, turning low-value materials into economically valuable resources. Its versatility allows for tailored products based on operational conditions, presenting itself as a cost-effective and efficient More of agricultural and forestry waste, biochar features a wide surface area and a highly porous structure. These characteristics allow it to effectively immobilize harmful hydrocarbons, significantly lowering their bioavailability in the environment. The study emphasizes that biochar’s performance is not uniform but varies based on the type of feedstockFeedstock refers to the raw organic material used to produce biochar. This can include a wide range of materials, such as wood chips, agricultural residues, and animal manure. More used and the specific temperatures applied during production. By optimizing these conditions, researchers can enhance the material’s ability to trap pollutants through mechanisms like pore-filling and specialized surface interactions.

One of the most compelling results identified in the manuscript is the rapid acceleration of global research interest in this field. A bibliometric analysis of literature spanning from 2010 to 2025 shows a clear exponential growth pattern in scientific publications. While early research focused broadly on general biochar characteristics, recent efforts have shifted toward complex mechanistic investigations and field-scale applications. This growth is closely aligned with international environmental regulations that increasingly support circular economy strategies and sustainable management techniques. Leading institutions in China, such as Hunan University and Nankai University, have been identified as primary contributors to this expanding body of high-impact research.

The review also highlights significant advances in biochar engineering, specifically the development of functionalized surfaces and composite materials. These modifications are designed to increase the efficiency of the adsorption process, making it competitive with traditional adsorbents like activated carbonActivated carbon is a form of carbon that has been processed to create a vast network of tiny pores, increasing its surface area significantly. This extensive surface area makes activated carbon exceptionally effective at trapping and holding impurities, like a molecular sponge. It is commonly More or clay minerals. Beyond simple physical trapping, biochar has been found to stimulate microbial activity by providing a sheltered habitat for bacteria that naturally degrade organic pollutants. This dual-action approach—combining physical adsorption with biological degradation—represents a major step forward in creating permanent solutions for contaminated industrial sites and mining areas.

Despite these positive findings, the researchers point out critical areas where further innovation is required to move from the laboratory to large-scale deployment. Current knowledge gaps include a lack of long-term stability data in complex soil environments and a need for standardized characterization methods. The study advocates for the increased use of life cycle assessments to fully gauge the economic and environmental viability of these strategies. Addressing these regulatory and practical challenges through closer cooperation between academia and industry will be essential for the future of sustainable soil remediation.

Source: Mogashane, T. M., Motlatle, M. A., Mkhohlakali, A. C., Mokoena, L. V., & Tshilongo, J. (2026). Biochar-based adsorption of polycyclic aromatic hydrocarbons in contaminated soils: Advances, mechanisms, and bibliometric analysis. Results in Engineering.