Lukáš Trakal et al. recently published new data about „Lead and cadmium sorption mechanisms on magnetically modified biochars“. The paper discusses how the impregnation with magnetic particles may improve the sorption efficiency for Pb and Cd, depending on the type of biochar.
Trakal L., Veselská V., Šafařík I., Vítková M., Číhalová S., Komárek M., 2016. Lead and cadmium sorption mechanisms on magnetically modified biochars. Bioresource Technology 203, 318–324.