Journal
PROCESSES
Volume 9, Issue 7, Pages -Publisher
MDPI
DOI: 10.3390/pr9071209
Keywords
biochar; heavy metal; adsorption; performance; mechanisms; potential risk analysis
Categories
Funding
- Natural Science Foundation of Hunan Province, China [2018JJ3242]
- China Postdoctoral Science Foundation [2018M630901]
Ask authors/readers for more resources
The novel manganese-rich pokeweed biochar showed great potential in removing heavy metals such as Cu2+, Pb2+, and Cd2+, with high adsorption capacities, recyclability, and reduced environmental pollution risks. The adsorption mechanisms involved ion exchange, electrostatic adsorption, chemical adsorption, and precipitation.
A novel manganese-rich pokeweed biochar was prepared at different temperatures from manganese-rich pokeweed plants collected at manganese tailings, resulting in materials identified as BC300, BC400, and BC500. The synthetized biochar materials were investigated as regards their potential for removing Cu2+, Pb2+, and Cd2+, specifically in terms of adsorption performances, adsorption kinetics, adsorption isotherms, and potential environmental pollution risk. The results showed that the sorption process fitted well to the pseudo-second-order kinetic and Langmuir models, and the maximum adsorption capacities of BC500 were 246, 326, and 310 mg.g(-1) for Cu2+, Pb2+, and Cd2+ respectively. The physicochemical characteristics of the biochars, and the adsorption mechanisms, were revealed by using scanning electron microscopy-energy spectrometer, elemental analysis, Brunauer-Emmett-Teller techniques, X-ray diffraction, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The sorption mechanism of these three heavy metal ions onto biochars included ion exchange, electrostatic adsorption, chemical adsorption, and precipitation. Besides, the potential pollution risk of manganese-rich pokeweed biochars was significantly reduced after pyrolysis. Therefore, it is feasible to transform manganese-rich pokeweed biomass into manganese-rich pokeweed biochar with potential for heavy metals removal, showing high adsorption capacity, recyclability, and low environmental pollution.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available