The Pb sorption primarily involved the coordination
with organic hydroxyl and carboxyl functional
groups as well as the co-precipitation on mineral surfaces.
The Gracilaria modified biochar, generated from
the waste after the commercial extraction of agar from
cultivated seaweeds with ferric chloride (FeCl3), immediately
removed 98% of the selenate (SeO2−
4 , hereafter
SeVI) from the prepared Se solution, but higher
concentrations of SO2−
4 reduced the uptake of SeVI
from acid mine effluents from coal mines and coal-fired
power stations (Johansson et al., 2015). The biocharimpregnated
sediment showed nearly 3 times more
attenuation capacity for cyanide than non-amended
sediment, thus indicating possibility of using biochar