Xiaoling Dong

TL;DR: This review summarizes the characteristics of biochar (e.g., surface area, porosity, pH, surface charge, functional groups, and mineral components) and main mechanisms governing sorption of As, Cr, Cd, Pb, and Hg by biochar and includes competitive sorption mechanisms of co-existing metals.

TL;DR: Results indicated that the electrostatic attraction of Cr(VI) to positively charged biochar surface, reduction of Cr-VI to Cr(III) ion, and complexation between Cr( III) ion and SBT's function groups were probably responsible for Cr( VI) removal by SBT biochar.

TL;DR: Pyrolysis temperature significantly affected biochar properties and played an important role in Pb sorption capacity and mechanisms by biochars.

TL;DR: It is suggested that Hg was irreversibly sorbed via complexation with phenolic hydroxyl and carboxylic groups in low temperature biochars (BP300 and BP450) and graphite-like structure in high temperature biochar (BP600).

TL;DR: The role of DOM, Cr(VI) and/or As(III) in Cr and As transformation may provide new insights into their speciation and toxicity in cold regions.