Bone Char Mediated Dechlorination of Trichloroethylene by Green Rust

• DOI: 10.1021/acs.est.9b07069
• Publication Date: 2020-02-28T02:50:45Z
• Authors: Jing Ai; Hui Ma; Dominique J. Tobler; Marco C. Mangayayam; Changyong Lu; Frans W. J. van d...; Weizhao Yin; Hans Christian Br...
• Keywords: Reactivity

Biochars function as electron transfer mediators and thus catalyze redox transformations of environmental pollutants. A previous study has shown that bone char (BC) high catalytic activity for reduction chlorinated ethylenes using layered Fe(II)–Fe(III) hydroxide (green rust) reductant. In the present study, we studied rate trichloroethylene (TCE) by green rust in presence BCs obtained at pyrolysis temperatures (PTs) from 450 to 1050 °C. The reactivity increased with PT, yielding a maximum pseudo-first-order constant (k) 2.0 h–1 BC pyrolyzed 950 °C, while no reaction was seen TCE sorption, specific surface area, extent graphitization, carbon content, aromaticity also PT. electron-accepting capacity (EAC) peaked PT 850 EAC linearly correlated sum concentrations quinoid, quaternary N, pyridine-N-oxide groups measured XPS. Moreover, graphene nanoparticles graphitized black, which have degrees graphitization but low values. Further analyses showed rates are well C/H ratio (proxy electrical conductivity) BCs, strongly indicating both functional electron-conducting domains crucial reactivity. delineates conditions designing redox-reactive biochars be used remediation sites contaminated solvents.