Removal of Copper (II) by Biochar Mediated by Dissolved Organic Matter.

ABSTRACT: The effects of humic acid (HA) and fulvic acid (FA) on Cu²⁺ adsorption on biochar were investigated, with mechanisms confirmed by excitation-emission matrix spectroscopy, Fourier transform infrared spectroscopy, and scanning electron microscopy. HA loading enhanced Cu²⁺ adsorption on biochar, with the maximum enhancement of 55.0% occurring at an HA loading of 100 mg-C/L. The adsorbed HA introduced many additional functional groups to biochar, thus enhancing Cu²⁺ adsorption, which decreased at HA concentrations >100 mg-C/L due to self-association of HA at high loading concentrations. In contrast, FA loading caused no enhancement on Cu²⁺ adsorption on biochar. FA was adsorbed through H-bonding with the functional groups of biochar, which set up a c

SUBMITTER: He P 

PROVIDER: S-EPMC5541037 | biostudies-literature | 2017 Aug

REPOSITORIES: biostudies-literature