The world stands at a critical juncture, with escalating energy demands and environmental challenges looming large. In this context, the transformation of lignocellulosic biomass into biochar emerges as a beacon of hope, offering sustainable and environmentally friendly solutions across diverse sectors. This review dives deep into the latest advancements in biomass conversion technologies, specifically focusing on biochar production from lignocellulosic biomass—a resource abundant in agricultural residues, forest wastes, and other plant materials. The meticulous process of biochar production, including carbonization and activation, is analyzed, highlighting its significance in renewable energy generation, waste management, and sustainable agriculture.

Exploring the wide-ranging applications of lignocellulosic biochar, from pollution adsorption and catalysis to energy storage, this review underscores the material’s potential to significantly reduce reliance on conventional energy sources and mineral resources. With an emphasis on the environmental benefits, including climate change mitigation and the promotion of sustainable agricultural practices, the review posits lignocellulosic biochar as a versatile solution to contemporary environmental and energy challenges.

By offering an extensive comparative analysis of various biochar preparation methods, this review facilitates a deeper understanding of their advantages and limitations. It paves the way for further research and development in harnessing lignocellulosic biomass for high-value, sustainable applications, ultimately contributing to a more sustainable future.