Tan, et al (2024) Comparison between Chemical Modification 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 for Different Environmental Applications. Chemical Engineering Transactions. DOI: 10.3303/CET24114090

Biochar, a carbon-rich material derived from 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, has gained attention for its environmental applications, such as pollutant removal, soil remediation, and wastewater treatment. While biochar’s inherent properties, like porosityPorosity of biochar is a key factor in its effectiveness as a soil amendment and its ability to retain water and nutrients. Biochar’s porosity is influenced by feedstock type and pyrolysis temperature, and it plays a crucial role in microbial activity and overall soil health. Biochar More and functional groups, offer some utility, chemical modifications can significantly enhance its performance.

Common modification methods include acid/base activation, nanomaterial impregnation, and magnetization. Acid treatments with reagents like nitric acid (HNO₃) and phosphoric acid (H₃PO₄) enhance biochar’s oxygen-containing functional groups, surface area, and porosity, making it effective for adsorbing pollutants. Conversely, base activations using sodium hydroxide (NaOH) or potassium hydroxide (KOH) can increase surface area and alkalinity, favoring the adsorption of negatively charged pollutants.

Nanomaterial impregnation introduces elements like magnesium oxide (MgO) or iron (Fe) into biochar’s structure, creating specific active sites for targeted pollutant removal. Magnetization, achieved using iron-based compounds, not only enhances pollutant adsorptionBiochar has a remarkable ability to attract and hold onto pollutants, like heavy metals and organic chemicals. This makes it a valuable tool for cleaning up contaminated soil and water.   More but also facilitates easy recovery of biochar using magnets.

Despite these advancements, challenges like optimizing modification efficiency and reducing chemical waste remain. Future research could focus on scaling these methods for industrial applications and performing lifecycle assessments to ensure alignment with sustainability goals.

By tailoring biochar through these methods, its versatility and effectiveness in addressing environmental challenges can be greatly expanded.