The global issue of heavy metals, hydrocarbons, pesticides, insecticides, and other agrochemical pollutants in food is exacerbated by their persistence, bioaccumulation, potential toxicity, and non-biodegradability, particularly concerning heavy metals. Agrochemicals, primarily used in livestock and crop cultivation, aim to mitigate losses from pest infestations and increase crop yields. The process of carbonizing wood for biochar production has been known to humanity since ancient times. Utilizing waste resources, advanced biochar technology has the potential to meet future energy needs and enhance soil carbon sequestration. Three commonly employed technologies in biochar production include fast pyrolysis, slow pyrolysis, and carbonization and gasification. Biochar (BC) has gained significant attention as a potential absorbent for controlling contaminants and purifying water due to its high surface area, porosity, and abundance of functional groups. However, the challenge of separating BC from water due to its low density and small particle size has restricted its applications. To address these issues, researchers have explored the development of BC-based 2D membranes, particularly in the form of mixed matrix membranes (MMMs) that combine BC with a polymeric matrix. The applications in the environmental remediation of inorganic pollutants provides a comprehensive overview of innovative strategies involving BC-based materials, emphasizing their preparation methods, properties, pollution removal performance, and adsorption mechanism.