Generation Mechanism of Persistent Free Radicals in Lignocellulose-Derived Biochar: Roles of Reducible Carbonyls

• DOI: 10.1021/acs.est.1c06997
• Publication Date: 2022-07-15T18:24:25Z
• Authors: Wenmei Tao; Peng Zhang; Hao Li; Qiliang Yang; Patryk Oleszczuk; Bo Pan
• Keywords: Reactivity; Degradation

Persistent free radicals (PFRs) in biochar can influence reactivity, promoting organic contaminant degradation or even causing certain toxic impacts. However, the PFR generation mechanism is not still well understood. An investigation of relationship between formation and chemical structure essential for understanding mechanism. Our situ measurement results showed that intensities increased from 0–509.5 to 146–5678 a.u. after being pyrolyzed at 300 °C 60 min. The significant positive correlation peak areas C═O aromatic C═C groups indicated PFRs was highly dependent on structures. reduction biochars by KBH4 resulted a 32.2 ± 2.49% decrease content relative increase C–O content, while other physicochemical properties did change. Thus, observed 49.3% signals this suggested reducible groups, possibly aldehydes, ketones, quinones, were closely associated with biochars. This study provides an insight into guides corresponding design property manipulation.