Release characteristics of biochar-derived dissolved organic matter and its impact on Cr( <scp>vi</scp> ) adsorption and reduction
Hui Liu, Ying Wang, Ying Wang, Shixu Wang, Jing Wu, Yulai Wang, Yulai Wang
Abstract
. The presence of BDOM accelerated the Cr(vi) adsorption rate on biochars due to their pre-complexing. Simultaneously, HC-BDOM acted as an electron donor and participate in Cr(vi) reduction directly, resulting in the synchronous reduction of Cr(vi) during its adsorption process. However, PC- and HPC-BDOM preferentially acted as electron acceptors, thus competing with Cr(vi) for Fe(ii) oxidation and decreased the Cr(vi) reduction rate. This study suggested that biochar from garden wastes has a great remediation potential for Cr-contaminated land and that BDOM (especially HC-BDOM) plays a significant role in increasing soil organic matter, stabilizing heavy metals and detoxifying toxic substances by oxidation-reduction.