Abstract

This review presents the production and use of biochar in terms of definition, chemical structure, utilization, and current global market, with an emphasis on the biotechnological applications of seaweed biochar. For this purpose, a literature search was conducted in various databases, using keywords and algorithms in both Spanish and English. The results indicate that biochar from seaweed is an efficient alternative for the remediation of terrestrial and/or aquatic ecosystems. The capacity to capture different types of pollutants (microplastics, heavy metals, polycyclic aromatic hydrocarbons, among others) provides biochar properties that make it an appropriate material for environmental remediation, including the reduction of greenhouse gas emissions. The co-production of biochar and bioenergy is an alternative to mitigating the effects of climate change, displacing the use of fossil fuels and sequestering carbon in stable soil reserves. In addition, the use of biochar as a soil amendment and fertilizer is a significant tool for increasing food security and expanding crop areas in zones with physically and chemically degraded soils, characterized by low organic matter content, inadequate chemical fertilizer content, poor water retention and toxicity from pollutants. Therefore, the use of seaweed biochar is an environmental tool with high added value. © Autor(es) 2025.