Premchand, et al (2024) Enhancing 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 production: A technical analysis of the combined influence of chemical activation (KOH and NaOH) and 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 atmospheres (N₂/CO₂) on yields and properties of rice husk-derived biochar. Journal of Environmental Management. https://doi.org/10.1016/j.jenvman.2024.123034

Biochar, derived from agricultural waste like rice husk, has promising applications in environmental management, particularly for pollutant removal. However, optimizing its properties remains challenging. A recent study explores how combining chemical activation with pyrolysis atmospheres (nitrogen and carbon dioxide) affects biochar’s performance.

Researchers experimented with sodium hydroxide (NaOH) and potassium hydroxide (KOH) as chemical activators, using both pre- and post-pyrolysis activation on rice husk biochar. Pyrolysis was conducted at 600°C under nitrogen (N2) and carbon dioxide (CO2) atmospheres to examine impacts on yield, surface area, 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 chemical composition.

Results indicated that CO2, particularly with pre-pyrolysis KOH activation, significantly improved biochar’s surface area and pore volume—essential qualities for applications like water purification. The CO2 atmosphere promoted oxygen-functional groups that enhance adsorption capacity. KOH proved more effective than NaOH in increasing porosity and stability due to its stronger basic properties.

Moreover, the CO2 atmosphere altered the gas composition released during pyrolysis, increasing hydrogen and carbon dioxide, which suggests potential for further energy applications. However, biochar’s thermal stability varied depending on the chemical activator and atmosphere.

Overall, using CO2 instead of N2 as the pyrolysis medium appears beneficial, offering both enhanced biochar properties and potential cost savings. This technique presents a sustainable method to produce high-quality biochar, applicable to various environmental uses, from pollutant capture to soil enhancement.