Arsenic contamination poses a significant threat to ecosystems and human health. In a recent review published in Ecotoxicology and Environmental Safety, Xiaoxian Yuan et al. discuss the use 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, particularly from waste 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 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 and metal-modified biochar, for the remediation of arsenic-contaminated soil. This blog post will delve into the key aspects of their review, highlighting the potential of biochar in combating this environmental challenge.

Biochar from 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 biomass, has garnered attention for its high adsorption capacity and microporosity, making it an ideal candidate for soil remediation. The review identifies various feedstocks for biochar preparation, including agricultural, domestic, and forestry wastes, providing a plentiful resource for biochar production.  

The effectiveness of biochar in arsenic removal can be enhanced through single or multi-metal modifications, using metals like iron, manganese, and cerium to improve the adsorption capacity for arsenite (As(III)) and arsenate (As(V)). The primary mechanisms involved in arsenic removal by biochar include ion exchange, electrostatic attraction, surface complexation, redox transformation, and H-bond formation.  

In conclusion, this review provides a comprehensive overview of the potential of waste biomass feedstock-based biochar and metal-modified biochar in remediating arsenic-contaminated soil. The insights presented offer valuable guidance for developing effective biochar-based strategies to combat arsenic pollution.  

SOURCE: Yuan, X., Li, S., Zhang, H., Liu, J., Yang, F., Wang, S., Bie, S., Wang, Z., Zhou, J., Wang, X., Liu, D., & Feng, C. (2025). A review on As-contaminated soil remediation using waste biomass feedstock-based biochar and metal-modified biochar. Ecotoxicology and Environmental Safety, 292, 117927.